private void CreateFluid(float radius, float density)
{
Bounds bounds = new Bounds();
Vector3 min = new Vector3(-8, 0, -1);
Vector3 max = new Vector3(-4, 8, 2);
min.x += radius;
min.y += radius;
min.z += radius;
max.x -= radius;
max.y -= radius;
max.z -= radius;
bounds.SetMinMax(min, max);
//The source will create a array of particles
//evenly spaced inside the bounds.
//Multiple the spacing by 0.9 to pack more
//particles into bounds.
float diameter = radius * 2;
ParticlesFromBounds source = new ParticlesFromBounds(diameter * 0.9f, bounds);
Debug.Log("Fluid Particles = " + source.NumParticles);
m_fluid = new FluidBody(source, radius, density, Matrix4x4.identity);
m_fluidSource = bounds;
}
/// <summary>
/// Fills the Volume texture with the particles densities.
/// That texture can then be used to render the fluid by
/// ray tracing in the meshes shader.
/// </summary>
public void FillVolume(FluidBody body, GridHash grid, SmoothingKernel kernel)
{
int computeKernel = m_shader.FindKernel("ComputeVolume");
m_shader.SetFloat("VolumeScale", PixelSize);
m_shader.SetVector("VolumeSize", Bounds.size);
m_shader.SetVector("VolumeTranslate", Bounds.min);
m_shader.SetFloat("HashScale", grid.InvCellSize);
m_shader.SetVector("HashSize", grid.Bounds.size);
m_shader.SetVector("HashTranslate", grid.Bounds.min);
m_shader.SetFloat("KernelRadius", kernel.Radius);
m_shader.SetFloat("KernelRadius2", kernel.Radius2);
m_shader.SetFloat("Poly6", kernel.POLY6);
m_shader.SetFloat("Density", body.Density);
m_shader.SetInt("NumParticles", body.NumParticles);
m_shader.SetFloat("ParticleVolume", body.ParticleVolume);
m_shader.SetBuffer(computeKernel, "IndexMap", grid.IndexMap);
m_shader.SetBuffer(computeKernel, "Table", grid.Table);
m_shader.SetBuffer(computeKernel, "Positions", body.Positions);
m_shader.SetBuffer(computeKernel, "Densities", body.Densities);
m_shader.SetTexture(computeKernel, "Volume", Volume);
m_shader.Dispatch(computeKernel, Groups.x, Groups.y, Groups.z);
}
public FluidSolver(FluidBody body, FluidBoundary boundary)
{
SolverIterations = 2;
ConstraintIterations = 2;
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 / THREAD_1D;
if (numParticles % THREAD_1D != 0)
{
Groups++;
}
m_shader = Resources.Load("FluidSolver") as ComputeShader;
}
