//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;
}
//given a cube region, create a fluid body
//the fluid body's size is defined relative to the size of the container
private void CreateFluid(float radius, float density, Vector3 containerPos, Vector3 resizeFactor,
Vector3 fluidBodyPos, Vector3 fluidBodyScale)
{
//the bounds of the (initial) fluid region
Bounds bounds = new Bounds();
//Vector3 min = new Vector3(-8, 0, -1);
//Vector3 max = new Vector3(0, 8, 1);
Bounds fluidChunkBound = new Bounds(fluidBodyPos, fluidBodyScale);
// Vector3 min = new Vector3(fluidBodyPos[0] - 0.5f * fluidBodyScale[0], fluidBodyPos[1] - 0.5f * fluidBodyScale[1], fluidBodyPos[2] - 0.5f * fluidBodyScale[2]);
// Vector3 max = new Vector3(fluidBodyPos[0] + 0.5f * fluidBodyScale[0], fluidBodyPos[1] + 0.5f * fluidBodyScale[1], fluidBodyPos[2] + 0.5f * fluidBodyScale[2]);
Vector3 min = fluidChunkBound.min;
Vector3 max = fluidChunkBound.max;
//create the fluid body according to the size and position of the container
//Vector3 ContainerMin = new Vector3(containerPos[0] - 0.5f * resizeFactor[0], containerPos[1] - 0.4f * resizeFactor[1], containerPos[2] - 0.25f * resizeFactor[2]);
//Vector3 ContainerMax = new Vector3(containerPos[0] + 0.02f * resizeFactor[0], containerPos[1] + 0.4f * resizeFactor[1], containerPos[2] + 0.25f * resizeFactor[2]);
//need to minus/plus a radius since the particles are defined as spheres
min.x += radius;
min.y += radius;
min.z += radius;
max.x -= radius;
max.y -= radius;
max.z -= radius;
//set the bound
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.
//create particles from the bound
float diameter = radius * 2;
ParticlesFromBounds source = new ParticlesFromBounds(diameter * 0.9f, bounds);
Debug.Log("Fluid Particles = " + source.NumParticles);
//create a new fluid body object given the particles contained in "source"
fusion_FluidBody = new FluidBody(source, radius, density, Matrix4x4.identity, FluidInitialVelocity);
// fusion_FluidBodySource = bounds;
}