//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; }