public void UpdateBoundary(FluidBoundary newBoundary)
{
Boundary = newBoundary;
float cellSize = Body.ParticleRadius * 4.0f;
int total = Body.NumParticles + Boundary.NumParticles;
Hash.Dispose();
Hash = new GridHash(Boundary.Bounds, total, cellSize);
}
//given a cube region, generate boundary particles around it
private void CreateBoundary(float radius, float density, Vector3 containerPos, Vector3 resizeFactor)
{
//innerBounds defines the region that fluid particles could move
Bounds innerBounds = new Bounds();
//create the fluid boundary according to the position and size of the container
//the information about the container is passed in via the Transformation
Vector3 min = new Vector3(containerPos[0] - 0.5f * resizeFactor[0], containerPos[1] - 0.5f * resizeFactor[1], containerPos[2] - 0.5f * resizeFactor[2]);
Vector3 max = new Vector3(containerPos[0] + 0.5f * resizeFactor[0], containerPos[1] + 0.5f * resizeFactor[1], containerPos[2] + 0.5f * resizeFactor[2]);
innerBounds.SetMinMax(min, max);
//Make the boundary 1 particle thick.
//The multiple by 1.2 adds a little of extra
//thickness incase the radius does not evenly
//divide into the bounds size. You might have
//particles missing from one side of the source
//bounds other wise.
float BoundaryThickness = 1;
float diameter = radius * 2;
min.x -= diameter * BoundaryThickness * 1.2f;
min.y -= diameter * BoundaryThickness * 1.2f;
min.z -= diameter * BoundaryThickness * 1.2f;
max.x += diameter * BoundaryThickness * 1.2f;
max.y += diameter * BoundaryThickness * 1.2f;
max.z += diameter * BoundaryThickness * 1.2f;
//outerBounds is the outmost bound of all particles
//A.K.A the boundary of the entire simulation
Bounds outerBounds = new Bounds();
outerBounds.SetMinMax(min, max);
//The source will create a array of particles
//evenly spaced between the inner and outer bounds.
ParticleSource source = new ParticlesFromBounds(diameter, outerBounds, innerBounds);
//print out the number of particles
Debug.Log("Boundary Particles = " + source.NumParticles);
//given the particle positions contained in "source" object
//create the fluid boundary object
fusion_FluidBoundary = new FluidBoundary(source, radius, density, Matrix4x4.identity);
//pass bounds objects
//fusion_innerSource = innerBounds;
//fusion_outerSource = outerBounds;
}
public FluidSolver(FluidBody body, FluidBoundary boundary, int densityComputeIteration, int constraintComputeIteration)
{
DensityComputeIterations = densityComputeIteration;
ConstraintComputeIterations = constraintComputeIteration;
Body = body;
Boundary = boundary;
float cellSize = Body.ParticleRadius * 4.0f;
int total = Body.NumParticles + Boundary.NumParticles;
Hash = new GridHash(Boundary.Bounds, total, cellSize);
Kernel = new SmoothingKernel(cellSize);
int numParticles = Body.NumParticles;
Groups = numParticles / THREADS;
if (numParticles % THREADS != 0)
{
Groups++;
}
fluidSolverShader = Resources.Load("FluidSolver") as ComputeShader;
}
