public void UpdateBorder(Material material, bool useOffset)
{
Swap();
GraphicUtil.BlitBorderWithInnerCopy(src, dst, material, useOffset);
}
void UpdateSimulation(float dt)
{
var dx = settings.dx;
// advect
if (settings.enableVelocityAdvection || settings.enableInkAdvection)
{
advectionMat.SetFloat("_ReciprocalDx", 1.0f / dx);
advectionMat.SetFloat("_DeltaTime", dt);
// advect velocity
if (settings.enableVelocityAdvection)
{
boundaryMat.SetFloat("_Scale", -1);
velocityBuf.UpdateBorder(boundaryMat, true);
advectionMat.SetTexture("_VelocityTex", velocityBuf.current);
advectionMat.SetFloat("_OneMinusDissipation", 1.0f);
velocityBuf.UpdateExceptBorder(advectionMat);
}
// advect ink
if (settings.enableInkAdvection)
{
boundaryMat.SetFloat("_Scale", 0);
inkBuf.UpdateBorder(boundaryMat, true);
advectionMat.SetTexture("_VelocityTex", velocityBuf.current);
advectionMat.SetFloat("_OneMinusDissipation", 1.0f - settings.inkDissipation);
inkBuf.UpdateExceptBorder(advectionMat);
}
}
// impulse
if (source.output > 0)
{
impulseMat.SetFloat("_Radius", settings.sourceRadius);
impulseMat.SetVector("_Position", source.position);
if (settings.enableVelocityImpulse)
{
var strength = new Vector4(
Mathf.Clamp(source.force.x, -1, 1),
Mathf.Clamp(source.force.y, -1, 1), 0, 0) * settings.strengthMul;
impulseMat.SetVector("_Color", strength);
Debug.Log(strength);
velocityBuf.UpdateExceptBorder(impulseMat);
}
if (settings.enableInkImpulse)
{
impulseMat.SetColor("_Color", source.color);
inkBuf.UpdateExceptBorder(impulseMat);
}
}
if (settings.viscosity > 0)
{
var alpha = dx * dx / (settings.viscosity * dt);
var beta = 4.0f + alpha;
solver.SolvePoisson(velocityBuf.current, velocityBuf.current,
settings.solverIterations,
alpha, beta);
}
if (settings.enablePressureUpdate)
{
divergenceMat.SetFloat("_HalfReciprocalDx", 0.5f / dx);
Graphics.Blit(velocityBuf.current, divergenceBuf, divergenceMat);
var alpha = -dx * dx;
var beta = 4.0f;
boundaryMat.SetFloat("_Scale", 1);
solver.SolvePoisson(pressureBuf, divergenceBuf,
settings.solverIterations,
alpha, beta, (arg1, arg2) =>
GraphicUtil.BlitBorderWithInnerCopy(arg1, arg2, boundaryMat, true));
}
boundaryMat.SetFloat("_Scale", -1);
velocityBuf.UpdateBorder(boundaryMat, true);
if (settings.enableSubstractPressureGradient)
{
substractGradientMat.SetFloat("_HalfReciprocalDx", 0.5f / dx);
substractGradientMat.SetTexture("_SecondTex", pressureBuf);
velocityBuf.UpdateExceptBorder(substractGradientMat);
}
}