void Update()
{
CheckInit();
var dt = 1f / fps;
var nSteps = _ticker.Count();
var dx = l / nGrids;
var mass = density * dx * dx;
sim.SetFloat(SHADER_DX, dx);
sim.SetFloat(SHADER_DT, dt);
sim.SetFloat(SHADER_T, tension / mass);
if (Input.GetMouseButton(0))
{
var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
if (collider.Raycast(ray, out hit, float.MaxValue))
{
var pxPos = nGrids * hit.textureCoord;
var projMat = Matrix4x4.Ortho(0f, nGrids, 0f, nGrids, -1f, 1f);
var brushTex = brushMat.mainTexture;
var brushSize = 0.128f * nGrids;
var paintRect = new Rect(pxPos.x - 0.5f * brushSize, pxPos.y - 0.5f * brushSize,
brushSize, brushSize);
GL.PushMatrix();
GL.LoadIdentity();
GL.LoadProjectionMatrix(projMat);
RenderTexture.active = _hvTex0;
Graphics.DrawTexture(paintRect, brushTex, brushMat);
RenderTexture.active = null;
GL.PopMatrix();
}
}
for (var i = 0; i < nSteps; i++)
{
Graphics.Blit(_hvTex0, _hvTex1, sim, 0);
Swap();
Graphics.Blit(_hvTex0, _nTex, sim, 1);
}
var mat = renderer.sharedMaterial;
mat.SetTexture(SHADER_BUMP_TEX, _nTex);
}