[import] Copy files from https://github.com/UltraCombos/Project_2018_Frozen/tree/master/Unity_2018_Frozen and copy UnityUtility files (git repo is removed). Upgraded to Unity 2017.4.16. This version is runnable (without kinect ditected particles)

.gitignore

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+
+/FrozenMaterial/
+
 # ---> Unity
 [Ll]ibrary/
 [Tt]emp/

Unity-19050-05-BallPool/.gitignore

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+
+### Unity ###
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/Assets/AssetStoreTools*
+
+# Visual Studio 2015 cache directory
+/.vs/
+
+# Autogenerated VS/MD/Consulo solution and project files
+ExportedObj/
+.consulo/
+*.csproj
+*.unityproj
+*.sln
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
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+*.pdb
+
+# Unity3D generated meta files
+*.pidb.meta
+
+# Unity3D Generated File On Crash Reports
+sysinfo.txt
+
+# Builds
+*.apk
+*.unitypackage
+
+
+# End of https://www.gitignore.io/api/unity

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Unity-19050-05-BallPool/Assets/FluidSim3D/Scripts/FireFluidSim.cs

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+using UnityEngine;
+using System.Collections;
+
+namespace FluidSim3DProject
+{
+	public class FireFluidSim : MonoBehaviour 
+	{
+		//DONT CHANGE THESE
+		const int READ = 0;
+		const int WRITE = 1;
+		const int PHI_N_HAT = 0;
+		const int PHI_N_1_HAT = 1;
+		
+		public enum ADVECTION { NORMAL = 1, BFECC = 2, MACCORMACK = 3 };
+		
+		//You can change this but you must change the same value in all the compute shader's to the same
+		//Must be a pow2 number
+		const int NUM_THREADS = 8;
+		
+		//You can change this or even use Time.DeltaTime but large time steps can cause numerical errors
+		const float TIME_STEP = 0.1f;
+		
+		public ADVECTION m_denstyAdvectionType = ADVECTION.NORMAL;
+		public ADVECTION m_reactionAdvectionType = ADVECTION.NORMAL;
+		public int m_width = 128;
+		public int m_height = 128;
+		public int m_depth = 128;
+		public int m_iterations = 10;
+		public float m_vorticityStrength = 1.0f;
+		public float m_densityAmount = 1.0f;
+		public float m_densityDissipation = 0.999f;
+		public float m_densityBuoyancy = 1.0f;
+		public float m_densityWeight = 0.0125f;
+		public float m_temperatureAmount = 10.0f;
+		public float m_temperatureDissipation = 0.995f;
+		public float m_reactionAmount = 1.0f;
+		public float m_reactionDecay = 0.001f;
+		public float m_reactionExtinguishment = 0.01f;
+		public float m_velocityDissipation = 0.995f;
+		public float m_inputRadius = 0.04f;
+		public Vector4 m_inputPos = new Vector4(0.5f,0.1f,0.5f,0.0f);
+		
+		float m_ambientTemperature = 0.0f;
+		
+		public ComputeShader m_applyImpulse, m_applyAdvect, m_computeVorticity;
+		public ComputeShader m_computeDivergence, m_computeJacobi, m_computeProjection;
+		public ComputeShader m_computeConfinement, m_computeObstacles, m_applyBuoyancy;
+		
+		Vector4 m_size;
+		ComputeBuffer[] m_density, m_velocity, m_pressure, m_temperature, m_phi, m_reaction;
+		ComputeBuffer m_temp3f, m_obstacles;
+
+		void Start () 
+		{
+			//Dimension sizes must be pow2 numbers
+			m_width = Mathf.ClosestPowerOfTwo(m_width);
+			m_height = Mathf.ClosestPowerOfTwo(m_height);
+			m_depth = Mathf.ClosestPowerOfTwo(m_depth);
+			
+			//Put all dimension sizes in a vector for easy parsing to shader and also prevents user changing
+			//dimension sizes during play
+			m_size = new Vector4(m_width, m_height, m_depth, 0.0f);
+			
+			//Create all the buffers needed
+			
+			int SIZE = m_width*m_height*m_depth;
+			
+			m_density = new ComputeBuffer[2];
+			m_density[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_density[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_temperature = new ComputeBuffer[2];
+			m_temperature[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_temperature[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_reaction = new ComputeBuffer[2];
+			m_reaction[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_reaction[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_phi = new ComputeBuffer[2];
+			m_phi[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_phi[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_velocity = new ComputeBuffer[2];
+			m_velocity[READ] = new ComputeBuffer(SIZE, sizeof(float)*3);
+			m_velocity[WRITE] = new ComputeBuffer(SIZE, sizeof(float)*3);
+			
+			m_pressure = new ComputeBuffer[2];
+			m_pressure[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_pressure[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_obstacles = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_temp3f = new ComputeBuffer(SIZE, sizeof(float)*3);
+			
+			//Any areas that are obstacles need to be masked of in the obstacle buffer
+			//At the moment is only the border around the edge of the buffers to enforce non-slip boundary conditions
+			ComputeObstacles();
+		
+		}
+		
+		void Swap(ComputeBuffer[] buffer)
+		{
+			ComputeBuffer tmp = buffer[READ];
+			buffer[READ] = buffer[WRITE];
+			buffer[WRITE] = tmp;
+		}
+		
+		void ComputeObstacles()
+		{
+			m_computeObstacles.SetVector("_Size", m_size);
+			m_computeObstacles.SetBuffer(0, "_Write", m_obstacles);
+			m_computeObstacles.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+		}
+		
+		void ApplyImpulse(float dt, float amount, ComputeBuffer[] buffer)
+		{
+			m_applyImpulse.SetVector("_Size", m_size);
+			m_applyImpulse.SetFloat("_Radius", m_inputRadius);
+			m_applyImpulse.SetFloat("_Amount", amount);
+			m_applyImpulse.SetFloat("_DeltaTime", dt);
+			m_applyImpulse.SetVector("_Pos", m_inputPos);
+			
+			m_applyImpulse.SetBuffer(0, "_Read", buffer[READ]);
+			m_applyImpulse.SetBuffer(0, "_Write", buffer[WRITE]);
+			
+			m_applyImpulse.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyExtinguishmentImpulse(float dt, float amount, ComputeBuffer[] buffer)
+		{
+			m_applyImpulse.SetVector("_Size", m_size);
+			m_applyImpulse.SetFloat("_Radius", m_inputRadius);
+			m_applyImpulse.SetFloat("_Amount", amount);
+			m_applyImpulse.SetFloat("_DeltaTime", dt);
+			m_applyImpulse.SetVector("_Pos", m_inputPos);
+			m_applyImpulse.SetFloat("_Extinguishment", m_reactionExtinguishment);
+			
+			m_applyImpulse.SetBuffer(1, "_Read", buffer[READ]);
+			m_applyImpulse.SetBuffer(1, "_Write", buffer[WRITE]);
+			m_applyImpulse.SetBuffer(1, "_Reaction", m_reaction[READ]);
+			
+			m_applyImpulse.Dispatch(1, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyBuoyancy(float dt)
+		{
+			m_applyBuoyancy.SetVector("_Size", m_size);
+			m_applyBuoyancy.SetVector("_Up", new Vector4(0,1,0,0));
+			m_applyBuoyancy.SetFloat("_Buoyancy", m_densityBuoyancy);
+			m_applyBuoyancy.SetFloat("_AmbientTemperature", m_ambientTemperature);
+			m_applyBuoyancy.SetFloat("_Weight", m_densityWeight);
+			m_applyBuoyancy.SetFloat("_DeltaTime", dt);
+			
+			m_applyBuoyancy.SetBuffer(0, "_Write", m_velocity[WRITE]);
+			m_applyBuoyancy.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_applyBuoyancy.SetBuffer(0, "_Density", m_density[READ]);
+			m_applyBuoyancy.SetBuffer(0, "_Temperature", m_temperature[READ]);
+			
+			m_applyBuoyancy.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void ApplyAdvection(float dt, float dissipation, float decay, ComputeBuffer[] buffer, float forward = 1.0f)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", forward);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Read1f", buffer[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Write1f", buffer[WRITE]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.NORMAL, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyAdvection(float dt, float dissipation, float decay, ComputeBuffer read, ComputeBuffer write, float forward = 1.0f)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", forward);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Read1f", read);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Write1f", write);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.NORMAL, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+		}
+		
+		void ApplyAdvectionBFECC(float dt, float dissipation, float decay, ComputeBuffer[] buffer)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", 1.0f);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Read1f", buffer[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Write1f", buffer[WRITE]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Phi_n_hat", m_phi[PHI_N_HAT]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.BFECC, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyAdvectionMacCormack(float dt, float dissipation, float decay, ComputeBuffer[] buffer)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", 1.0f);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Read1f", buffer[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Write1f", buffer[WRITE]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Phi_n_1_hat", m_phi[PHI_N_1_HAT]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Phi_n_hat", m_phi[PHI_N_HAT]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.MACCORMACK, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyAdvectionVelocity(float dt)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", m_velocityDissipation);
+			m_applyAdvect.SetFloat("_Forward", 1.0f);
+			m_applyAdvect.SetFloat("_Decay", 0.0f);
+			
+			m_applyAdvect.SetBuffer(0, "_Read3f", m_velocity[READ]);
+			m_applyAdvect.SetBuffer(0, "_Write3f", m_velocity[WRITE]);
+			m_applyAdvect.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void ComputeVorticityConfinement(float dt)
+		{
+			m_computeVorticity.SetVector("_Size", m_size);
+			
+			m_computeVorticity.SetBuffer(0, "_Write", m_temp3f);
+			m_computeVorticity.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			
+			m_computeVorticity.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			m_computeConfinement.SetVector("_Size", m_size);
+			m_computeConfinement.SetFloat("_DeltaTime", dt);
+			m_computeConfinement.SetFloat("_Epsilon", m_vorticityStrength);
+			
+			m_computeConfinement.SetBuffer(0, "_Write", m_velocity[WRITE]);
+			m_computeConfinement.SetBuffer(0, "_Read", m_velocity[READ]);
+			m_computeConfinement.SetBuffer(0, "_Vorticity", m_temp3f);
+			
+			m_computeConfinement.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void ComputeDivergence()
+		{
+			m_computeDivergence.SetVector("_Size", m_size);
+			
+			m_computeDivergence.SetBuffer(0, "_Write", m_temp3f);
+			m_computeDivergence.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_computeDivergence.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			m_computeDivergence.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+		}
+		
+		void ComputePressure()
+		{
+			m_computeJacobi.SetVector("_Size", m_size);
+			m_computeJacobi.SetBuffer(0, "_Divergence", m_temp3f);
+			m_computeJacobi.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			for(int i = 0; i < m_iterations; i++)
+			{
+				m_computeJacobi.SetBuffer(0, "_Write", m_pressure[WRITE]);
+				m_computeJacobi.SetBuffer(0, "_Pressure", m_pressure[READ]);
+				
+				m_computeJacobi.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+				
+				Swap(m_pressure);
+			}
+		}
+		
+		void ComputeProjection()
+		{
+			m_computeProjection.SetVector("_Size", m_size);
+			m_computeProjection.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			m_computeProjection.SetBuffer(0, "_Pressure", m_pressure[READ]);
+			m_computeProjection.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_computeProjection.SetBuffer(0, "_Write", m_velocity[WRITE]);
+			
+			m_computeProjection.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void Update () 
+		{
+			
+			float dt = TIME_STEP;
+			
+			//First off advect any buffers that contain physical quantities like density or temperature by the 
+			//velocity field. Advection is what moves values around.
+			ApplyAdvection(dt, m_temperatureDissipation, 0.0f, m_temperature);
+			
+			//Normal advection can cause smoothing of the advected field making the results look less interesting.
+			//BFECC is a method of advection that helps to prevents this smoothing at a extra performance cost but is less numerically stable.
+			//MacCormack does the same as BFECC but is more (not completely) numerically stable and is more costly
+			//You only really need to do this type of advection on visible fields, but you can do it on non visible ones if you want
+			if(m_denstyAdvectionType == ADVECTION.BFECC)
+			{
+				ApplyAdvection(dt, 1.0f, 0.0f, m_density, 1.0f); //advect forward into write buffer
+				ApplyAdvection(dt, 1.0f, 0.0f, m_density[READ], m_phi[PHI_N_HAT], -1.0f); //advect back into phi_n_hat buffer
+				ApplyAdvectionBFECC(dt, m_densityDissipation, 0.0f, m_density); //advect using BFECC
+			}
+			else if(m_denstyAdvectionType == ADVECTION.MACCORMACK)
+			{
+				ApplyAdvection(dt, 1.0f, 0.0f, m_density[READ], m_phi[PHI_N_1_HAT], 1.0f); //advect forward into phi_n_1_hat buffer
+				ApplyAdvection(dt, 1.0f, 0.0f, m_phi[PHI_N_1_HAT], m_phi[PHI_N_HAT], -1.0f); //advect back into phi_n_hat buffer
+				ApplyAdvectionMacCormack(dt, m_densityDissipation, 0.0f, m_density);	
+			}
+			else
+			{
+				ApplyAdvection(dt, m_densityDissipation, 0.0f, m_density);
+			}
+			
+			//The reaction advection looks better using normal for shorter lived fire (ie a hight decay rate) and 
+			//looks better with BFECC or macCormack for longer lived fire (in my opinion)
+			if(m_reactionAdvectionType == ADVECTION.BFECC)
+			{
+				ApplyAdvection(dt, 1.0f, 0.0f, m_reaction, 1.0f); //advect forward into write buffer
+				ApplyAdvection(dt, 1.0f, 0.0f, m_reaction[READ], m_phi[PHI_N_HAT], -1.0f); //advect back into phi_n_hat buffer
+				ApplyAdvectionBFECC(dt, 1.0f, m_reactionDecay, m_reaction); //advect using BFECC
+			}
+			else if(m_reactionAdvectionType == ADVECTION.MACCORMACK)
+			{
+				ApplyAdvection(dt, 1.0f, 0.0f, m_reaction[READ], m_phi[PHI_N_1_HAT], 1.0f); //advect forward into phi_n_1_hat buffer
+				ApplyAdvection(dt, 1.0f, 0.0f, m_phi[PHI_N_1_HAT], m_phi[PHI_N_HAT], -1.0f); //advect back into phi_n_hat buffer
+				ApplyAdvectionMacCormack(dt, 1.0f, m_reactionDecay, m_reaction);	
+			}
+			else
+			{
+				ApplyAdvection(dt, 1.0f, m_reactionDecay, m_reaction);
+			}
+			
+			//The velocity field also advects its self. 
+			ApplyAdvectionVelocity(dt);
+			
+			//Apply the effect the sinking colder smoke has on the velocity field
+			ApplyBuoyancy(dt);
+			
+			//Adds a certain amount of reaction (fire) and temperate
+			ApplyImpulse(dt, m_reactionAmount, m_reaction);
+			ApplyImpulse(dt,  m_temperatureAmount, m_temperature);
+			
+			//The smoke is formed when the reaction is extinguished. When the reaction amount
+			//falls below the extinguishment factor smoke is added
+			ApplyExtinguishmentImpulse(dt, m_densityAmount, m_density);
+			
+			//The fuild sim math tends to remove the swirling movement of fluids.
+			//This step will try and add it back in
+			ComputeVorticityConfinement(dt);
+			
+			//Compute the divergence of the velocity field. In fluid simulation the
+			//fluid is modelled as being incompressible meaning that the volume of the fluid
+			//does not change over time. The divergence is the amount the field has deviated from being divergence free
+			ComputeDivergence();
+			
+			//This computes the pressure need return the fluid to a divergence free condition
+			ComputePressure();
+			
+			//Subtract the pressure field from the velocity field enforcing the divergence free conditions
+			ComputeProjection();
+			
+			//rotation of box not support because ray cast in shader uses a AABB intersection
+			transform.rotation = Quaternion.identity;
+			
+			GetComponent<Renderer>().material.SetVector("_Translate", transform.localPosition);
+			GetComponent<Renderer>().material.SetVector("_Scale", transform.localScale);
+			GetComponent<Renderer>().material.SetBuffer("_Density", m_density[READ]);
+			GetComponent<Renderer>().material.SetBuffer("_Reaction", m_reaction[READ]);
+			GetComponent<Renderer>().material.SetVector("_Size", m_size);
+		
+		}
+		
+		void OnDestroy()
+		{
+			m_density[READ].Release();	
+			m_density[WRITE].Release();
+			m_temperature[READ].Release();
+			m_temperature[WRITE].Release();
+			m_reaction[READ].Release();
+			m_reaction[WRITE].Release();
+			m_phi[PHI_N_1_HAT].Release();	
+			m_phi[PHI_N_HAT].Release();
+			m_velocity[READ].Release();
+			m_velocity[WRITE].Release();
+			m_pressure[READ].Release();
+			m_pressure[WRITE].Release();
+			m_obstacles.Release();
+			m_temp3f.Release();
+					
+		}
+	}
+
+}
+	
+	
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+	
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+	
+	
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+	

Unity-19050-05-BallPool/Assets/FluidSim3D/Scripts/FireFluidSim.cs.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 164869986c15313419bf6ec021c90430
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Scripts/SmokeFluidSim.cs

@@ -0,0 +1,436 @@
+using UnityEngine;
+using System.Collections;
+
+namespace FluidSim3DProject
+{
+	public class SmokeFluidSim : MonoBehaviour 
+	{
+		//DONT CHANGE THESE
+		const int READ = 0;
+		const int WRITE = 1;
+		const int PHI_N_HAT = 0;
+		const int PHI_N_1_HAT = 1;
+		
+		public enum ADVECTION { NORMAL = 1, BFECC = 2, MACCORMACK = 3 };
+		
+		//You can change this but you must change the same value in all the compute shader's to the same
+		//Must be a pow2 number
+		const int NUM_THREADS = 8;
+		
+		//You can change this or even use Time.DeltaTime but large time steps can cause numerical errors
+		const float TIME_STEP = 0.1f;
+		
+		public ADVECTION m_advectionType = ADVECTION.NORMAL;
+		public int m_width = 128;
+		public int m_height = 128;
+		public int m_depth = 128;
+		public int m_iterations = 10;
+		public float m_vorticityStrength = 1.0f;
+		public float m_densityAmount = 1.0f;
+		public float m_densityDissipation = 0.999f;
+		public float m_densityBuoyancy = 1.0f;
+		public float m_densityWeight = 0.0125f;
+		public float m_temperatureAmount = 10.0f;
+		public float m_temperatureDissipation = 0.995f;
+		public float m_velocityDissipation = 0.995f;
+		public float m_inputRadius = 0.04f;
+		public Vector4 m_inputPos = new Vector4(0.5f,0.1f,0.5f,0.0f);
+		
+		float m_ambientTemperature = 0.0f;
+		
+		public ComputeShader m_applyImpulse, m_applyAdvect, m_computeVorticity;
+		public ComputeShader m_computeDivergence, m_computeJacobi, m_computeProjection;
+		public ComputeShader m_computeConfinement, m_computeObstacles, m_applyBuoyancy;
+		
+		Vector4 m_size;
+		ComputeBuffer[] m_density, m_velocity, m_pressure, m_temperature, m_phi;
+		ComputeBuffer m_temp3f, m_obstacles;
+
+        // Ultracombos -------------------------------------------
+
+        [Header("Ultracombos Custom")]
+        public bool doUpdate = true;
+        public bool doDraw = true;
+        public float timeStepMultiplier = 5.0f;
+        public ComputeBuffer DensityBuffer { get { return m_density[READ]; } }
+        public ComputeBuffer VelocityBuffer { get { return m_velocity[READ]; } }
+        public ComputeBuffer TemperatureBuffer { get { return m_temperature[READ]; } }
+        public ComputeBuffer ObstacleBuffer { get { return m_obstacles; } }
+        public Vector4 GridSize { get { return transform.lossyScale; } }
+        public Vector4 GridRoot { get { return transform.position - transform.lossyScale * 0.5f; } }
+        public Vector4 GridDim { get { return m_size; } }
+        
+        // Ultracombos -------------------------------------------
+
+        void Start () 
+		{
+			//Dimension sizes must be pow2 numbers
+			m_width = Mathf.ClosestPowerOfTwo(m_width);
+			m_height = Mathf.ClosestPowerOfTwo(m_height);
+			m_depth = Mathf.ClosestPowerOfTwo(m_depth);
+			
+			//Put all dimension sizes in a vector for easy parsing to shader and also prevents user changing
+			//dimension sizes during play
+			m_size = new Vector4(m_width, m_height, m_depth, 0.0f);
+			
+			//Create all the buffers needed
+			
+			int SIZE = m_width*m_height*m_depth;
+			
+			m_density = new ComputeBuffer[2];
+			m_density[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_density[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_temperature = new ComputeBuffer[2];
+			m_temperature[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_temperature[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_phi = new ComputeBuffer[2];
+			m_phi[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_phi[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_velocity = new ComputeBuffer[2];
+			m_velocity[READ] = new ComputeBuffer(SIZE, sizeof(float)*3);
+			m_velocity[WRITE] = new ComputeBuffer(SIZE, sizeof(float)*3);
+			
+			m_pressure = new ComputeBuffer[2];
+			m_pressure[READ] = new ComputeBuffer(SIZE, sizeof(float));
+			m_pressure[WRITE] = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_obstacles = new ComputeBuffer(SIZE, sizeof(float));
+			
+			m_temp3f = new ComputeBuffer(SIZE, sizeof(float)*3);
+			
+			//Any areas that are obstacles need to be masked of in the obstacle buffer
+			//At the moment is only the border around the edge of the buffers to enforce non-slip boundary conditions
+			ComputeObstacles();
+		
+		}
+		
+		void Swap(ComputeBuffer[] buffer)
+		{
+			ComputeBuffer tmp = buffer[READ];
+			buffer[READ] = buffer[WRITE];
+			buffer[WRITE] = tmp;
+		}
+		
+		void ComputeObstacles()
+		{
+			m_computeObstacles.SetVector("_Size", m_size);
+			m_computeObstacles.SetBuffer(0, "_Write", m_obstacles);
+			m_computeObstacles.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+		}
+		
+		void ApplyImpulse(float dt, float amount, ComputeBuffer[] buffer)
+		{
+			m_applyImpulse.SetVector("_Size", m_size);
+			m_applyImpulse.SetFloat("_Radius", m_inputRadius);
+			m_applyImpulse.SetFloat("_Amount", amount);
+			m_applyImpulse.SetFloat("_DeltaTime", dt);
+			m_applyImpulse.SetVector("_Pos", m_inputPos);
+			
+			m_applyImpulse.SetBuffer(0, "_Read", buffer[READ]);
+			m_applyImpulse.SetBuffer(0, "_Write", buffer[WRITE]);
+
+            m_applyImpulse.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyBuoyancy(float dt)
+		{
+			m_applyBuoyancy.SetVector("_Size", m_size);
+			m_applyBuoyancy.SetVector("_Up", new Vector4(0,1,0,0));
+			m_applyBuoyancy.SetFloat("_Buoyancy", m_densityBuoyancy);
+			m_applyBuoyancy.SetFloat("_AmbientTemperature", m_ambientTemperature);
+			m_applyBuoyancy.SetFloat("_Weight", m_densityWeight);
+			m_applyBuoyancy.SetFloat("_DeltaTime", dt);
+			
+			m_applyBuoyancy.SetBuffer(0, "_Write", m_velocity[WRITE]);
+			m_applyBuoyancy.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_applyBuoyancy.SetBuffer(0, "_Density", m_density[READ]);
+			m_applyBuoyancy.SetBuffer(0, "_Temperature", m_temperature[READ]);
+			
+			m_applyBuoyancy.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void ApplyAdvection(float dt, float dissipation, float decay, ComputeBuffer[] buffer, float forward = 1.0f)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", forward);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Read1f", buffer[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Write1f", buffer[WRITE]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.NORMAL, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyAdvection(float dt, float dissipation, float decay, ComputeBuffer read, ComputeBuffer write, float forward = 1.0f)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", forward);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Read1f", read);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Write1f", write);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.NORMAL, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.NORMAL, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+		}
+		
+		void ApplyAdvectionBFECC(float dt, float dissipation, float decay, ComputeBuffer[] buffer)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", 1.0f);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Read1f", buffer[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Write1f", buffer[WRITE]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Phi_n_hat", m_phi[PHI_N_HAT]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.BFECC, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.BFECC, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyAdvectionMacCormack(float dt, float dissipation, float decay, ComputeBuffer[] buffer)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", dissipation);
+			m_applyAdvect.SetFloat("_Forward", 1.0f);
+			m_applyAdvect.SetFloat("_Decay", decay);
+			
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Read1f", buffer[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Write1f", buffer[WRITE]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Phi_n_1_hat", m_phi[PHI_N_1_HAT]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Phi_n_hat", m_phi[PHI_N_HAT]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer((int)ADVECTION.MACCORMACK, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch((int)ADVECTION.MACCORMACK, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(buffer);
+		}
+		
+		void ApplyAdvectionVelocity(float dt)
+		{
+			m_applyAdvect.SetVector("_Size", m_size);
+			m_applyAdvect.SetFloat("_DeltaTime", dt);
+			m_applyAdvect.SetFloat("_Dissipate", m_velocityDissipation);
+			m_applyAdvect.SetFloat("_Forward", 1.0f);
+			m_applyAdvect.SetFloat("_Decay", 0.0f);
+			
+			m_applyAdvect.SetBuffer(0, "_Read3f", m_velocity[READ]);
+			m_applyAdvect.SetBuffer(0, "_Write3f", m_velocity[WRITE]);
+			m_applyAdvect.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_applyAdvect.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			m_applyAdvect.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void ComputeVorticityConfinement(float dt)
+		{
+			m_computeVorticity.SetVector("_Size", m_size);
+			
+			m_computeVorticity.SetBuffer(0, "_Write", m_temp3f);
+			m_computeVorticity.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			
+			m_computeVorticity.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			m_computeConfinement.SetVector("_Size", m_size);
+			m_computeConfinement.SetFloat("_DeltaTime", dt);
+			m_computeConfinement.SetFloat("_Epsilon", m_vorticityStrength);
+			
+			m_computeConfinement.SetBuffer(0, "_Write", m_velocity[WRITE]);
+			m_computeConfinement.SetBuffer(0, "_Read", m_velocity[READ]);
+			m_computeConfinement.SetBuffer(0, "_Vorticity", m_temp3f);
+			
+			m_computeConfinement.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+		
+		void ComputeDivergence()
+		{
+			m_computeDivergence.SetVector("_Size", m_size);
+			
+			m_computeDivergence.SetBuffer(0, "_Write", m_temp3f);
+			m_computeDivergence.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_computeDivergence.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			m_computeDivergence.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+		}
+		
+		void ComputePressure()
+		{
+			m_computeJacobi.SetVector("_Size", m_size);
+			m_computeJacobi.SetBuffer(0, "_Divergence", m_temp3f);
+			m_computeJacobi.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			for(int i = 0; i < m_iterations; i++)
+			{
+				m_computeJacobi.SetBuffer(0, "_Write", m_pressure[WRITE]);
+				m_computeJacobi.SetBuffer(0, "_Pressure", m_pressure[READ]);
+				
+				m_computeJacobi.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+				
+				Swap(m_pressure);
+			}
+		}
+		
+		void ComputeProjection()
+		{
+			m_computeProjection.SetVector("_Size", m_size);
+			m_computeProjection.SetBuffer(0, "_Obstacles", m_obstacles);
+			
+			m_computeProjection.SetBuffer(0, "_Pressure", m_pressure[READ]);
+			m_computeProjection.SetBuffer(0, "_Velocity", m_velocity[READ]);
+			m_computeProjection.SetBuffer(0, "_Write", m_velocity[WRITE]);
+			
+			m_computeProjection.Dispatch(0, (int)m_size.x/NUM_THREADS, (int)m_size.y/NUM_THREADS, (int)m_size.z/NUM_THREADS);
+			
+			Swap(m_velocity);
+		}
+
+        private void FixedUpdate()
+        //void Update () 
+		{
+            GetComponent<MeshRenderer>().enabled = doDraw;
+
+            if (doUpdate == false)
+                return;
+
+            float dt = Time.fixedDeltaTime * timeStepMultiplier;
+            //float dt = TIME_STEP;
+            Simulation(dt);
+        }
+		
+		void OnDestroy()
+		{
+			m_density[READ].Release();	
+			m_density[WRITE].Release();
+			m_temperature[READ].Release();
+			m_temperature[WRITE].Release();
+			m_phi[PHI_N_1_HAT].Release();	
+			m_phi[PHI_N_HAT].Release();
+			m_velocity[READ].Release();
+			m_velocity[WRITE].Release();
+			m_pressure[READ].Release();
+			m_pressure[WRITE].Release();
+			m_obstacles.Release();
+			m_temp3f.Release();
+					
+		}
+
+        void Simulation(float dt)
+        {
+            //First off advect any buffers that contain physical quantities like density or temperature by the 
+            //velocity field. Advection is what moves values around.
+            ApplyAdvection(dt, m_temperatureDissipation, 0.0f, m_temperature);
+
+            //Normal advection can cause smoothing of the advected field making the results look less interesting.
+            //BFECC is a method of advection that helps to prevents this smoothing at a extra performance cost but is less numerically stable.
+            //MacCormack does the same as BFECC but is more (not completely) numerically stable and is more costly
+            if (m_advectionType == ADVECTION.BFECC)
+            {
+                ApplyAdvection(dt, 1.0f, 0.0f, m_density, 1.0f); //advect forward into write buffer
+                ApplyAdvection(dt, 1.0f, 0.0f, m_density[READ], m_phi[PHI_N_HAT], -1.0f); //advect back into phi_n_hat buffer
+                ApplyAdvectionBFECC(dt, m_densityDissipation, 0.0f, m_density); //advect using BFECC
+            }
+            else if (m_advectionType == ADVECTION.MACCORMACK)
+            {
+                ApplyAdvection(dt, 1.0f, 0.0f, m_density[READ], m_phi[PHI_N_1_HAT], 1.0f); //advect forward into phi_n_1_hat buffer
+                ApplyAdvection(dt, 1.0f, 0.0f, m_phi[PHI_N_1_HAT], m_phi[PHI_N_HAT], -1.0f); //advect back into phi_n_hat buffer
+                ApplyAdvectionMacCormack(dt, m_densityDissipation, 0.0f, m_density);
+            }
+            else
+            {
+                ApplyAdvection(dt, m_densityDissipation, 0.0f, m_density);
+            }
+
+            //The velocity field also advects its self. 
+            ApplyAdvectionVelocity(dt);
+
+            //Apply the effect the sinking colder smoke has on the velocity field
+            ApplyBuoyancy(dt);
+
+            //Adds a certain amount of density (the visible smoke) and temperate
+            ApplyImpulse(dt, m_densityAmount, m_density);
+            ApplyImpulse(dt, m_temperatureAmount, m_temperature);
+
+            //The fuild sim math tends to remove the swirling movement of fluids.
+            //This step will try and add it back in
+            ComputeVorticityConfinement(dt);
+
+            //Compute the divergence of the velocity field. In fluid simulation the
+            //fluid is modelled as being incompressible meaning that the volume of the fluid
+            //does not change over time. The divergence is the amount the field has deviated from being divergence free
+            ComputeDivergence();
+
+            //This computes the pressure need return the fluid to a divergence free condition
+            ComputePressure();
+
+            //Subtract the pressure field from the velocity field enforcing the divergence free conditions
+            ComputeProjection();
+
+            //rotation of box not support because ray cast in shader uses a AABB intersection
+            transform.rotation = Quaternion.identity;
+
+            GetComponent<Renderer>().material.SetVector("_Translate", transform.localPosition);
+            GetComponent<Renderer>().material.SetVector("_Scale", transform.localScale);
+            GetComponent<Renderer>().material.SetBuffer("_Density", m_density[READ]);
+            GetComponent<Renderer>().material.SetVector("_Size", m_size);
+        }
+	}
+
+}
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	

Unity-19050-05-BallPool/Assets/FluidSim3D/Scripts/SmokeFluidSim.cs.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: a924471615937564f81ebb1540cd8b36
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders.meta

@@ -0,0 +1,5 @@
+fileFormatVersion: 2
+guid: 8fe3db169bedce248a2ab634d707f41c
+folderAsset: yes
+DefaultImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ApplyAdvection.compute

@@ -0,0 +1,244 @@
+
+#define NUM_THREADS 8
+
+
+float4 _Size;
+float _DeltaTime, _Dissipate, _Decay, _Forward;
+
+StructuredBuffer<float3> _Velocity;
+StructuredBuffer<float> _Obstacles;
+
+RWStructuredBuffer<float> _Write1f;
+StructuredBuffer<float> _Read1f;
+
+RWStructuredBuffer<float3> _Write3f;
+StructuredBuffer<float3> _Read3f;
+
+StructuredBuffer<float> _Phi_n_1_hat, _Phi_n_hat;
+
+
+float3 GetAdvectedPosTexCoords(float3 pos, int idx)
+{
+    pos -= _DeltaTime * _Forward * _Velocity[idx];
+
+    return pos;
+}
+
+float SampleBilinear(StructuredBuffer<float> buffer, float3 uv, float3 size)
+{
+	int x = uv.x;
+	int y = uv.y;
+	int z = uv.z;
+	
+	int X = size.x;
+	int XY = size.x*size.y;
+	
+	float fx = uv.x-x;
+	float fy = uv.y-y;
+	float fz = uv.z-z;
+	
+	int xp1 = min(size.x-1, x+1);
+	int yp1 = min(size.y-1, y+1);
+	int zp1 = min(size.z-1, z+1);
+	
+	float x0 = buffer[x+y*X+z*XY] * (1.0f-fx) + buffer[xp1+y*X+z*XY] * fx;
+	float x1 = buffer[x+y*X+zp1*XY] * (1.0f-fx) + buffer[xp1+y*X+zp1*XY] * fx;
+	
+	float x2 = buffer[x+yp1*X+z*XY] * (1.0f-fx) + buffer[xp1+yp1*X+z*XY] * fx;
+	float x3 = buffer[x+yp1*X+zp1*XY] * (1.0f-fx) + buffer[xp1+yp1*X+zp1*XY] * fx;
+	
+	float z0 = x0 * (1.0f-fz) + x1 * fz;
+	float z1 = x2 * (1.0f-fz) + x3 * fz;
+	
+	return z0 * (1.0f-fy) + z1 * fy;
+
+}
+
+float3 SampleBilinear(StructuredBuffer<float3> buffer, float3 uv, float3 size)
+{
+	int x = uv.x;
+	int y = uv.y;
+	int z = uv.z;
+	
+	int X = size.x;
+	int XY = size.x*size.y;
+	
+	float fx = uv.x-x;
+	float fy = uv.y-y;
+	float fz = uv.z-z;
+	
+	int xp1 = min(size.x-1, x+1);
+	int yp1 = min(size.y-1, y+1);
+	int zp1 = min(size.z-1, z+1);
+	
+	float3 x0 = buffer[x+y*X+z*XY] * (1.0f-fx) + buffer[xp1+y*X+z*XY] * fx;
+	float3 x1 = buffer[x+y*X+zp1*XY] * (1.0f-fx) + buffer[xp1+y*X+zp1*XY] * fx;
+	
+	float3 x2 = buffer[x+yp1*X+z*XY] * (1.0f-fx) + buffer[xp1+yp1*X+z*XY] * fx;
+	float3 x3 = buffer[x+yp1*X+zp1*XY] * (1.0f-fx) + buffer[xp1+yp1*X+zp1*XY] * fx;
+	
+	float3 z0 = x0 * (1.0f-fz) + x1 * fz;
+	float3 z1 = x2 * (1.0f-fz) + x3 * fz;
+	
+	return z0 * (1.0f-fy) + z1 * fy;
+
+}
+
+#pragma kernel AdvectVelocity
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void AdvectVelocity(uint3 id : SV_DispatchThreadID)
+{
+
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+	if(_Obstacles[idx] > 0.1)
+	{
+		 _Write3f[idx] = float3(0,0,0);
+		 return;
+	}
+
+	float3 uv = GetAdvectedPosTexCoords(id, idx);
+			
+   	_Write3f[idx] = SampleBilinear(_Read3f, uv, _Size.xyz) * _Dissipate;
+   	
+}
+
+#pragma kernel Advect
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void Advect(uint3 id : SV_DispatchThreadID)
+{
+
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+	if(_Obstacles[idx] > 0.1)
+	{
+		 _Write1f[idx] = 0;
+		 return;
+	}
+
+	float3 uv = GetAdvectedPosTexCoords(id, idx);
+			
+   	_Write1f[idx] = max(0, SampleBilinear(_Read1f, uv, _Size.xyz) * _Dissipate - _Decay);
+
+}
+
+#pragma kernel AdvectBFECC
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void AdvectBFECC(uint3 id : SV_DispatchThreadID)
+{
+
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+	if(_Obstacles[idx] > 0.1)
+	{
+		 _Write1f[idx] = 0;
+		 return;
+	}
+	
+	float3 uv = GetAdvectedPosTexCoords(id, idx);
+	
+	float r;
+	float4 halfVolumeDim = _Size/2;
+    float3 diff = abs( halfVolumeDim.xyz - id );
+
+    // Must use regular semi-Lagrangian advection instead of BFECC at the volume boundaries
+    if( (diff.x > (halfVolumeDim.x-4)) || (diff.y > (halfVolumeDim.y-4)) || (diff.z > (halfVolumeDim.z-4)) )
+    {
+       r = SampleBilinear(_Read1f, uv, _Size.xyz);
+    }
+    else
+    {
+        r = 1.5f * SampleBilinear(_Read1f, uv, _Size.xyz) - 0.5f * SampleBilinear(_Phi_n_hat, uv, _Size.xyz);
+    }
+    
+   	_Write1f[idx] = max(0, r * _Dissipate - _Decay);
+   	
+}
+
+#pragma kernel AdvectMacCormack
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void AdvectMacCormack(uint3 id : SV_DispatchThreadID)
+{
+
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+	if(_Obstacles[idx] > 0.1)
+	{
+		 _Write1f[idx] = 0;
+		 return;
+	}
+	
+	float3 uv = GetAdvectedPosTexCoords(id, idx);
+	
+	float r;
+	float4 halfVolumeDim = _Size/2;
+    float3 diff = abs( halfVolumeDim.xyz - id );
+
+    // Must use regular semi-Lagrangian advection instead of MacCormack at the volume boundaries
+    if( (diff.x > (halfVolumeDim.x-4)) || (diff.y > (halfVolumeDim.y-4)) || (diff.z > (halfVolumeDim.z-4)) )
+    {
+       r = SampleBilinear(_Read1f, uv, _Size.xyz);
+    }
+    else
+    {
+        int idx0 = (id.x-1) + (id.y-1)*_Size.x + (id.z-1)*_Size.x*_Size.y;
+	    int idx1 = (id.x-1) + (id.y-1)*_Size.x + (id.z+1)*_Size.x*_Size.y;
+	    
+        int idx2 = (id.x-1) + (id.y+1)*_Size.x + (id.z-1)*_Size.x*_Size.y;
+	    int idx3 = (id.x-1) + (id.y+1)*_Size.x + (id.z+1)*_Size.x*_Size.y;
+	    
+        int idx4 = (id.x+1) + (id.y-1)*_Size.x + (id.z-1)*_Size.x*_Size.y;
+	    int idx5 = (id.x+1) + (id.y-1)*_Size.x + (id.z+1)*_Size.x*_Size.y;
+	    
+        int idx6 = (id.x+1) + (id.y+1)*_Size.x + (id.z-1)*_Size.x*_Size.y;
+	    int idx7 = (id.x+1) + (id.y+1)*_Size.x + (id.z+1)*_Size.x*_Size.y;
+	           
+	    float nodes[8];
+		nodes[0] = _Read1f[ idx0 ];
+	    nodes[1] = _Read1f[ idx1 ];
+	    
+	    nodes[2] = _Read1f[ idx2 ];
+	    nodes[3] = _Read1f[ idx3 ];
+	    
+	    nodes[4] = _Read1f[ idx4 ];
+	    nodes[5] = _Read1f[ idx5 ];
+	    
+	   	nodes[6] = _Read1f[ idx6 ];
+	    nodes[7] = _Read1f[ idx7 ];
+	    
+	    float minPhi = min(min(min(min(min(min(min(nodes[0],nodes[1]),nodes[2]),nodes[3]),nodes[4]),nodes[5]),nodes[6]),nodes[7]);
+	    
+	    float maxPhi = max(max(max(max(max(max(max(nodes[0],nodes[1]),nodes[2]),nodes[3]),nodes[4]),nodes[5]),nodes[6]),nodes[7]);
+   
+        r =  SampleBilinear(_Phi_n_1_hat, uv, _Size.xyz) + 0.5f * (_Read1f[idx] - _Phi_n_hat[idx]);
+        
+        r = max(min(r, maxPhi), minPhi);
+    }
+    
+   	_Write1f[idx] = max(0, r * _Dissipate - _Decay);
+   	
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ApplyAdvection.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: 411cedf0db0a1904693c77b97afbf915
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ApplyBuoyancy.compute

@@ -0,0 +1,47 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float4 _Size, _Up;
+float _AmbientTemperature, _DeltaTime, _Buoyancy, _Weight;
+
+RWStructuredBuffer<float3> _Write;
+StructuredBuffer<float3> _Velocity;
+StructuredBuffer<float> _Density, _Temperature;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+
+    int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    float T = _Temperature[idx];
+    float D = _Density[idx];
+    float3 V = _Velocity[idx];
+    
+    if(T > _AmbientTemperature)
+    	V += (_DeltaTime * (T - _AmbientTemperature) * _Buoyancy - D * _Weight) * _Up.xyz;
+    
+    _Write[idx] = V;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ApplyBuoyancy.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: 0d7710a16db583e418df13bddb0be43d
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ApplyImpulse.compute

@@ -0,0 +1,57 @@
+
+#define NUM_THREADS 8
+
+float _Radius, _Amount, _DeltaTime, _Extinguishment;
+float4 _Pos, _Size;
+
+RWStructuredBuffer<float> _Write;
+StructuredBuffer<float> _Read, _Reaction;
+
+#pragma kernel GaussImpulse
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void GaussImpulse(uint3 id : SV_DispatchThreadID)
+{
+
+	float3 pos = id/(_Size.xyz-1.0f) - _Pos.xyz;
+	float mag = pos.x*pos.x + pos.y*pos.y + pos.z*pos.z;
+	float rad2 = _Radius*_Radius;
+	
+	float amount = exp(-mag/rad2) * _Amount * _DeltaTime;
+				
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+    _Write[idx] = _Read[idx] + amount;
+}
+
+#pragma kernel ExtinguishmentImpluse
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void ExtinguishmentImpluse(uint3 id : SV_DispatchThreadID)
+{
+			
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+	float amount = 0.0;
+	float reaction = _Reaction[idx];
+	
+	if(reaction > 0.0 && reaction < _Extinguishment) 
+		amount = _Amount * reaction;
+	
+    _Write[idx] = _Read[idx] + amount;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ApplyImpulse.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: a080c25e6daeb0d4e88fced65f9959ce
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeConfinement.compute

@@ -0,0 +1,44 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float _DeltaTime, _Epsilon;
+float4 _Size;
+
+RWStructuredBuffer<float3> _Write;
+StructuredBuffer<float3> _Vorticity, _Read;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+
+    int idxL = max(0, id.x-1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    int idxR = min(_Size.x-1, id.x+1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxB = id.x + max(0, id.y-1)*_Size.x + id.z*_Size.x*_Size.y;
+    int idxT = id.x + min(_Size.y-1, id.y+1)*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxD = id.x + id.y*_Size.x + max(0, id.z-1)*_Size.x*_Size.y;
+    int idxU = id.x + id.y*_Size.x + min(_Size.z-1, id.z+1)*_Size.x*_Size.y;
+    
+	float omegaL = length(_Vorticity[ idxL ]);
+    float omegaR = length(_Vorticity[ idxR ]);
+    
+    float omegaB = length(_Vorticity[ idxB ]);
+    float omegaT = length(_Vorticity[ idxT ]);
+    
+    float omegaD = length(_Vorticity[ idxD ]);
+    float omegaU = length(_Vorticity[ idxU ]);
+    
+    int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    float3 omega = _Vorticity[idx];
+    
+    float3 eta = 0.5 * float3( omegaR - omegaL, omegaT - omegaB, omegaU - omegaD );
+
+    eta = normalize( eta + float3(0.001,0.001,0.001) );
+    
+    float3 force = _DeltaTime * _Epsilon * float3( eta.y * omega.z - eta.z * omega.y, eta.z * omega.x - eta.x * omega.z, eta.x * omega.y - eta.y * omega.x );
+	
+    _Write[idx] = _Read[idx] + force;
+}

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeConfinement.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: 4b0055f0edf774c4ea97ac8cd62e6158
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeDivergence.compute

@@ -0,0 +1,49 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float4 _Size;
+
+RWStructuredBuffer<float3> _Write;
+StructuredBuffer<float3> _Velocity;
+StructuredBuffer<float> _Obstacles;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+
+    int idxL = max(0, id.x-1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    int idxR = min(_Size.x-1, id.x+1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxB = id.x + max(0, id.y-1)*_Size.x + id.z*_Size.x*_Size.y;
+    int idxT = id.x + min(_Size.y-1, id.y+1)*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxD = id.x + id.y*_Size.x + max(0, id.z-1)*_Size.x*_Size.y;
+    int idxU = id.x + id.y*_Size.x + min(_Size.z-1, id.z+1)*_Size.x*_Size.y;
+    
+	float3 L = _Velocity[ idxL ];
+    float3 R = _Velocity[ idxR ];
+    
+    float3 B = _Velocity[ idxB ];
+    float3 T = _Velocity[ idxT ];
+    
+    float3 D = _Velocity[ idxD ];
+    float3 U = _Velocity[ idxU ];
+    
+    float3 obstacleVelocity = float3(0,0,0);
+    
+    if(_Obstacles[idxL] > 0.1) L = obstacleVelocity;
+    if(_Obstacles[idxR] > 0.1) R = obstacleVelocity;
+    
+    if(_Obstacles[idxB] > 0.1) B = obstacleVelocity;
+    if(_Obstacles[idxT] > 0.1) T = obstacleVelocity;
+    
+    if(_Obstacles[idxD] > 0.1) D = obstacleVelocity;
+    if(_Obstacles[idxU] > 0.1) U = obstacleVelocity;
+    
+    float divergence =  0.5 * ( ( R.x - L.x ) + ( T.y - B.y ) + ( U.z - D.z ) );
+    
+    int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    _Write[idx] = float3(divergence,0,0);
+}

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeDivergence.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: e25212f321912c44ab6d9430762d37b6
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeJacobi.compute

@@ -0,0 +1,65 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float4 _Size;
+
+RWStructuredBuffer<float> _Write;
+StructuredBuffer<float> _Pressure, _Obstacles;
+StructuredBuffer<float3> _Divergence;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+
+    int idxL = max(0, id.x-1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    int idxR = min(_Size.x-1, id.x+1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxB = id.x + max(0, id.y-1)*_Size.x + id.z*_Size.x*_Size.y;
+    int idxT = id.x + min(_Size.y-1, id.y+1)*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxD = id.x + id.y*_Size.x + max(0, id.z-1)*_Size.x*_Size.y;
+    int idxU = id.x + id.y*_Size.x + min(_Size.z-1, id.z+1)*_Size.x*_Size.y;
+    
+	float L = _Pressure[ idxL ];
+    float R = _Pressure[ idxR ];
+    
+    float B = _Pressure[ idxB ];
+    float T = _Pressure[ idxT ];
+    
+    float D = _Pressure[ idxD ];
+    float U = _Pressure[ idxU ];
+    
+    int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    float C = _Pressure[idx];
+    
+    float divergence = _Divergence[idx].r;
+    
+    if(_Obstacles[idxL] > 0.1) L = C;
+    if(_Obstacles[idxR] > 0.1) R = C;
+    
+    if(_Obstacles[idxB] > 0.1) B = C;
+    if(_Obstacles[idxT] > 0.1) T = C;
+    
+    if(_Obstacles[idxD] > 0.1) D = C;
+    if(_Obstacles[idxU] > 0.1) U = C;
+    
+    _Write[idx] = ( L + R + B + T + U + D - divergence ) / 6.0;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeJacobi.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: cebd12b982d79674aab2ed65879e49d0
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeObstacles.compute

@@ -0,0 +1,47 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float4 _Size;
+
+RWStructuredBuffer<float> _Write;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+
+    int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    float obstacle = 0;
+    
+    if(id.x-1 < 0) obstacle = 1;
+    if(id.x+1 > (int)_Size.x-1) obstacle = 1;
+    
+    if(id.y-1 < 0) obstacle = 1;
+    if(id.y+1 > (int)_Size.y-1) obstacle = 1;
+    
+    if(id.z-1 < 0) obstacle = 1;
+    if(id.z+1 > (int)_Size.z-1) obstacle = 1;
+    
+    _Write[idx] = obstacle;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeObstacles.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: 6a49b38e37bae7a4ab2903fbdde8e4ac
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeProjection.compute

@@ -0,0 +1,76 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float4 _Size;
+
+RWStructuredBuffer<float3> _Write;
+StructuredBuffer<float> _Pressure, _Obstacles;
+StructuredBuffer<float3> _Velocity;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+
+	if(_Obstacles[idx] > 0.1)
+	{
+		 _Write[idx] = float3(0,0,0);
+		 return;
+	}
+
+    int idxL = max(0, id.x-1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    int idxR = min(_Size.x-1, id.x+1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxB = id.x + max(0, id.y-1)*_Size.x + id.z*_Size.x*_Size.y;
+    int idxT = id.x + min(_Size.y-1, id.y+1)*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxD = id.x + id.y*_Size.x + max(0, id.z-1)*_Size.x*_Size.y;
+    int idxU = id.x + id.y*_Size.x + min(_Size.z-1, id.z+1)*_Size.x*_Size.y;
+    
+	float L = _Pressure[ idxL ];
+    float R = _Pressure[ idxR ];
+    
+    float B = _Pressure[ idxB ];
+    float T = _Pressure[ idxT ];
+    
+    float D = _Pressure[ idxD ];
+    float U = _Pressure[ idxU ];
+    
+    float C = _Pressure[idx];
+    
+    float3 mask = float3(1,1,1);
+    
+    if(_Obstacles[idxL] > 0.1) { L = C; mask.x = 0; }
+    if(_Obstacles[idxR] > 0.1) { R = C; mask.x = 0; }
+    
+    if(_Obstacles[idxB] > 0.1) { B = C; mask.y = 0; }
+    if(_Obstacles[idxT] > 0.1) { T = C; mask.y = 0; }
+    
+    if(_Obstacles[idxD] > 0.1) { D = C; mask.z = 0; }
+    if(_Obstacles[idxU] > 0.1) { U = C; mask.z = 0; }
+    
+    float3 v = _Velocity[idx] - float3( R - L, T - B, U - D ) * 0.5;
+    
+    _Write[idx] = v * mask;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeProjection.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: aa1de4528a2c0d24983dce181ecd63af
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeVorticity.compute

@@ -0,0 +1,37 @@
+
+#pragma kernel CSMain
+#define NUM_THREADS 8
+
+float4 _Size;
+
+RWStructuredBuffer<float3> _Write;
+StructuredBuffer<float3> _Velocity;
+
+[numthreads(NUM_THREADS,NUM_THREADS,NUM_THREADS)]
+void CSMain (int3 id : SV_DispatchThreadID)
+{
+
+    int idxL = max(0, id.x-1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    int idxR = min(_Size.x-1, id.x+1) + id.y*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxB = id.x + max(0, id.y-1)*_Size.x + id.z*_Size.x*_Size.y;
+    int idxT = id.x + min(_Size.y-1, id.y+1)*_Size.x + id.z*_Size.x*_Size.y;
+    
+    int idxD = id.x + id.y*_Size.x + max(0, id.z-1)*_Size.x*_Size.y;
+    int idxU = id.x + id.y*_Size.x + min(_Size.z-1, id.z+1)*_Size.x*_Size.y;
+
+	float3 L = _Velocity[ idxL ];
+    float3 R = _Velocity[ idxR ];
+    
+    float3 B = _Velocity[ idxB ];
+    float3 T = _Velocity[ idxT ];
+    
+    float3 D = _Velocity[ idxD ];
+    float3 U = _Velocity[ idxU ];
+    
+    float3 vorticity = 0.5 * float3( (( T.z - B.z ) - ( U.y - D.y )) , (( U.x - D.x ) - ( R.z - L.z )) , (( R.y - L.y ) - ( T.x - B.x )) );
+			
+	int idx = id.x + id.y*_Size.x + id.z*_Size.x*_Size.y;
+	
+    _Write[idx] = vorticity;
+}

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/ComputeVorticity.compute.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: 62b5b102c778bbd4682f63bf0a9bd2fe
+ComputeShaderImporter:
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/FireRayCast.shader

@@ -0,0 +1,193 @@
+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
+
+
+Shader "3DFluidSim/FireRayCast" 
+{
+	Properties
+	{
+		_FireGradient("FireGradient", 2D) = "red" {}
+		_SmokeColor("SmokeGradient", Color) = (0,0,0,1)
+		_SmokeAbsorption("SmokeAbsorbtion", float) = 60.0
+		_FireAbsorption("FireAbsorbtion", float) = 40.0
+	}
+	SubShader 
+	{
+		Tags { "Queue" = "Transparent" }
+	
+    	Pass 
+    	{
+    	
+    		Cull front
+    		Blend SrcAlpha OneMinusSrcAlpha
+
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#pragma target 5.0
+			#pragma vertex vert
+			#pragma fragment frag
+			
+			#define NUM_SAMPLES 64
+			
+			sampler2D _FireGradient;
+			float4 _SmokeColor;
+			float _SmokeAbsorption, _FireAbsorption;
+			uniform float3 _Translate, _Scale, _Size;
+			
+			StructuredBuffer<float> _Density, _Reaction;
+		
+			struct v2f 
+			{
+    			float4 pos : SV_POSITION;
+    			float3 worldPos : TEXCOORD0;
+			};
+
+			v2f vert(appdata_base v)
+			{
+    			v2f OUT;
+    			OUT.pos = UnityObjectToClipPos(v.vertex);
+    			OUT.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+    			return OUT;
+			}
+			
+			struct Ray {
+				float3 origin;
+				float3 dir;
+			};
+			
+			struct AABB {
+			    float3 Min;
+			    float3 Max;
+			};
+			
+			//find intersection points of a ray with a box
+			bool intersectBox(Ray r, AABB aabb, out float t0, out float t1)
+			{
+			    float3 invR = 1.0 / r.dir;
+			    float3 tbot = invR * (aabb.Min-r.origin);
+			    float3 ttop = invR * (aabb.Max-r.origin);
+			    float3 tmin = min(ttop, tbot);
+			    float3 tmax = max(ttop, tbot);
+			    float2 t = max(tmin.xx, tmin.yz);
+			    t0 = max(t.x, t.y);
+			    t = min(tmax.xx, tmax.yz);
+			    t1 = min(t.x, t.y);
+			    return t0 <= t1;
+			}
+			
+			float SampleBilinear(StructuredBuffer<float> buffer, float3 uv, float3 size)
+			{
+				uv = saturate(uv);
+				uv = uv * (size-1.0);
+			
+				int x = uv.x;
+				int y = uv.y;
+				int z = uv.z;
+				
+				int X = size.x;
+				int XY = size.x*size.y;
+				
+				float fx = uv.x-x;
+				float fy = uv.y-y;
+				float fz = uv.z-z;
+				
+				int xp1 = min(_Size.x-1, x+1);
+				int yp1 = min(_Size.y-1, y+1);
+				int zp1 = min(_Size.z-1, z+1);
+				
+				float x0 = buffer[x+y*X+z*XY] * (1.0f-fx) + buffer[xp1+y*X+z*XY] * fx;
+				float x1 = buffer[x+y*X+zp1*XY] * (1.0f-fx) + buffer[xp1+y*X+zp1*XY] * fx;
+				
+				float x2 = buffer[x+yp1*X+z*XY] * (1.0f-fx) + buffer[xp1+yp1*X+z*XY] * fx;
+				float x3 = buffer[x+yp1*X+zp1*XY] * (1.0f-fx) + buffer[xp1+yp1*X+zp1*XY] * fx;
+				
+				float z0 = x0 * (1.0f-fz) + x1 * fz;
+				float z1 = x2 * (1.0f-fz) + x3 * fz;
+				
+				return z0 * (1.0f-fy) + z1 * fy;
+				
+			}
+
+			
+			float4 frag(v2f IN) : COLOR
+			{
+				float3 pos = _WorldSpaceCameraPos;
+			
+				Ray r;
+				r.origin = pos;
+				r.dir = normalize(IN.worldPos-pos);
+				
+				AABB aabb;
+				aabb.Min = float3(-0.5,-0.5,-0.5)*_Scale + _Translate;
+				aabb.Max = float3(0.5,0.5,0.5)*_Scale + _Translate;
+
+				//figure out where ray from eye hit front of cube
+				float tnear, tfar;
+				intersectBox(r, aabb, tnear, tfar);
+				
+				//if eye is in cube then start ray at eye
+				if (tnear < 0.0) tnear = 0.0;
+
+				float3 rayStart = r.origin + r.dir * tnear;
+    			float3 rayStop = r.origin + r.dir * tfar;
+    			
+    			//convert to texture space
+    			rayStart -= _Translate;
+    			rayStop -= _Translate;
+   				rayStart = (rayStart + 0.5*_Scale)/_Scale;
+   				rayStop = (rayStop + 0.5*_Scale)/_Scale;
+  
+				float3 start = rayStart;
+				float dist = distance(rayStop, rayStart);
+				float stepSize = dist/float(NUM_SAMPLES);
+			    float3 ds = normalize(rayStop-rayStart) * stepSize;
+			    float fireAlpha = 1.0, smokeAlpha = 1.0;
+			
+   				for(int i=0; i < NUM_SAMPLES; i++, start += ds) 
+   				{
+   				 
+   					float D = SampleBilinear(_Density, start, _Size);
+   					
+   					float R = SampleBilinear(_Reaction, start, _Size);
+   				 	
+        			fireAlpha *= 1.0-saturate(R*stepSize*_FireAbsorption);
+        			
+        			smokeAlpha *= 1.0-saturate(D*stepSize*_SmokeAbsorption);
+        			
+        			if(fireAlpha <= 0.01 && smokeAlpha <= 0.01) break;
+			    }
+			    
+			    float4 smoke = _SmokeColor * (1.0-smokeAlpha);
+			    
+			    float4 fire = tex2D(_FireGradient, float2(fireAlpha,0)) * (1.0-fireAlpha);
+			    
+				return fire + smoke;
+			}
+			
+			ENDCG
+
+    	}
+	}
+}
+
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Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/FireRayCast.shader.meta

@@ -0,0 +1,5 @@
+fileFormatVersion: 2
+guid: ce7e14398ee00d84193a82fb0174f3f6
+ShaderImporter:
+  defaultTextures: []
+  userData: 

Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/SmokeRayCast.shader

@@ -0,0 +1,183 @@
+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
+
+
+Shader "3DFluidSim/SmokeRayCast" 
+{
+	Properties
+	{
+		_SmokeColor("SmokeGradient", Color) = (0,0,0,1)
+		_SmokeAbsorption("SmokeAbsorbtion", float) = 60.0
+	}
+	SubShader 
+	{
+		Tags { "Queue" = "Transparent" }
+	
+    	Pass 
+    	{
+    	
+    		Cull front
+    		Blend SrcAlpha OneMinusSrcAlpha
+
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#pragma target 5.0
+			#pragma vertex vert
+			#pragma fragment frag
+			
+			#define NUM_SAMPLES 64
+			
+			float4 _SmokeColor;
+			float _SmokeAbsorption;
+			uniform float3 _Translate, _Scale, _Size;
+			
+			StructuredBuffer<float> _Density;
+		
+			struct v2f 
+			{
+    			float4 pos : SV_POSITION;
+    			float3 worldPos : TEXCOORD0;
+			};
+
+			v2f vert(appdata_base v)
+			{
+    			v2f OUT;
+    			OUT.pos = UnityObjectToClipPos(v.vertex);
+    			OUT.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+    			return OUT;
+			}
+			
+			struct Ray {
+				float3 origin;
+				float3 dir;
+			};
+			
+			struct AABB {
+			    float3 Min;
+			    float3 Max;
+			};
+			
+			//find intersection points of a ray with a box
+			bool intersectBox(Ray r, AABB aabb, out float t0, out float t1)
+			{
+			    float3 invR = 1.0 / r.dir;
+			    float3 tbot = invR * (aabb.Min-r.origin);
+			    float3 ttop = invR * (aabb.Max-r.origin);
+			    float3 tmin = min(ttop, tbot);
+			    float3 tmax = max(ttop, tbot);
+			    float2 t = max(tmin.xx, tmin.yz);
+			    t0 = max(t.x, t.y);
+			    t = min(tmax.xx, tmax.yz);
+			    t1 = min(t.x, t.y);
+			    return t0 <= t1;
+			}
+			
+			float SampleBilinear(StructuredBuffer<float> buffer, float3 uv, float3 size)
+			{
+				uv = saturate(uv);
+				uv = uv * (size-1.0);
+				
+				int x = uv.x;
+				int y = uv.y;
+				int z = uv.z;
+				
+				int X = size.x;
+				int XY = size.x*size.y;
+				
+				float fx = uv.x-x;
+				float fy = uv.y-y;
+				float fz = uv.z-z;
+				
+				int xp1 = min(_Size.x-1, x+1);
+				int yp1 = min(_Size.y-1, y+1);
+				int zp1 = min(_Size.z-1, z+1);
+				
+				float x0 = buffer[x+y*X+z*XY] * (1.0f-fx) + buffer[xp1+y*X+z*XY] * fx;
+				float x1 = buffer[x+y*X+zp1*XY] * (1.0f-fx) + buffer[xp1+y*X+zp1*XY] * fx;
+				
+				float x2 = buffer[x+yp1*X+z*XY] * (1.0f-fx) + buffer[xp1+yp1*X+z*XY] * fx;
+				float x3 = buffer[x+yp1*X+zp1*XY] * (1.0f-fx) + buffer[xp1+yp1*X+zp1*XY] * fx;
+				
+				float z0 = x0 * (1.0f-fz) + x1 * fz;
+				float z1 = x2 * (1.0f-fz) + x3 * fz;
+				
+				return z0 * (1.0f-fy) + z1 * fy;
+				
+			}
+
+			
+			float4 frag(v2f IN) : COLOR
+			{
+			
+				float3 pos = _WorldSpaceCameraPos;
+			
+				Ray r;
+				r.origin = pos;
+				r.dir = normalize(IN.worldPos-pos);
+				
+				AABB aabb;
+				aabb.Min = float3(-0.5,-0.5,-0.5)*_Scale + _Translate;
+				aabb.Max = float3(0.5,0.5,0.5)*_Scale + _Translate;
+
+				//figure out where ray from eye hit front of cube
+				float tnear, tfar;
+				intersectBox(r, aabb, tnear, tfar);
+				
+				//if eye is in cube then start ray at eye
+				if (tnear < 0.0) tnear = 0.0;
+
+				float3 rayStart = r.origin + r.dir * tnear;
+    			float3 rayStop = r.origin + r.dir * tfar;
+    			
+    			//convert to texture space
+    			rayStart -= _Translate;
+    			rayStop -= _Translate;
+   				rayStart = (rayStart + 0.5*_Scale)/_Scale;
+   				rayStop = (rayStop + 0.5*_Scale)/_Scale;
+   				
+				float3 start = rayStart;
+				float dist = distance(rayStop, rayStart);
+				float stepSize = dist/float(NUM_SAMPLES);
+			    float3 ds = normalize(rayStop-rayStart) * stepSize;
+			    float alpha = 1.0;
+
+   				for(int i=0; i < NUM_SAMPLES; i++, start += ds) 
+   				{
+   				 
+   					float D = SampleBilinear(_Density, start, _Size);
+   				 	
+        			alpha *= 1.0-saturate(D*stepSize*_SmokeAbsorption);
+        			
+        			if(alpha <= 0.01) break;
+			    }
+			    
+				return _SmokeColor * (1-alpha);
+			}
+			
+			ENDCG
+
+    	}
+	}
+}
+
+
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Unity-19050-05-BallPool/Assets/FluidSim3D/Shaders/SmokeRayCast.shader.meta

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Unity-19050-05-BallPool/Assets/FluidSim3D/SmokeFluid.unity

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class FluidSimInputController : MonoBehaviour
+{
+    [SerializeField]
+    FluidSim3DProject.SmokeFluidSim fluidSimulation;
+    public SmokeFluidSimUniforms uniforms;
+
+    List<Transform> children = new List<Transform>();
+    int child_index = 0;
+
+    void Start()
+    {
+
+    }
+    
+    void Update()
+    {
+        children.Clear();
+        for (int i = 0; i < transform.childCount; i++)
+        {
+            var child = transform.GetChild(i);
+            if (child.gameObject.activeSelf)
+                children.Add(child);
+        }
+            
+
+        Vector3 size = fluidSimulation.GridSize;
+        Vector3 root = fluidSimulation.GridRoot;
+        Vector3 inv_size = new Vector3(1.0f / size.x, 1.0f / size.y, 1.0f / size.z);
+
+        if (children.Count > 0)
+        {
+            child_index %= children.Count;
+
+            var trans = children[child_index];
+            Vector3 pos = Vector3.Scale(trans.position - root, inv_size);
+            pos.x = Mathf.Clamp01(pos.x);
+            pos.y = Mathf.Clamp01(pos.y);
+            pos.z = Mathf.Clamp01(pos.z);
+
+            fluidSimulation.m_inputPos = pos;
+            fluidSimulation.m_inputRadius = trans.lossyScale.x / size.x;
+
+            child_index++;
+        }
+        else
+        {
+            fluidSimulation.m_inputPos = Vector4.zero;
+            fluidSimulation.m_inputRadius = 0.0f;
+        }
+
+        {
+            fluidSimulation.m_vorticityStrength = uniforms.m_vorticityStrength;
+            fluidSimulation.m_densityAmount = uniforms.m_densityAmount;
+            fluidSimulation.m_densityDissipation = uniforms.m_densityDissipation;
+            fluidSimulation.m_densityBuoyancy = uniforms.m_densityBuoyancy;
+            fluidSimulation.m_densityWeight = uniforms.m_densityWeight;
+            fluidSimulation.m_temperatureAmount = uniforms.m_temperatureAmount;
+            fluidSimulation.m_temperatureDissipation = uniforms.m_temperatureDissipation;
+            fluidSimulation.m_velocityDissipation = uniforms.m_velocityDissipation;
+        }
+        
+    }
+}

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[CreateAssetMenu(order = 1000, menuName = "UltraCombos/SmokeFluidSimUniforms", fileName = "SmokeFluidSimUniforms")]
+public class SmokeFluidSimUniforms : ScriptableObject
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+    [Range(0, 1)]
+    public float m_velocityDissipation = 0.995f;
+
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