public static GHydraulicErosionParams Create()
{
GHydraulicErosionParams param = new GHydraulicErosionParams();
param.Iteration = 10;
param.Rain = 0.5f;
param.Transportation = 0.1f;
param.AngleMin = 5;
param.Evaporation = 0.1f;
param.Dimension = Vector3.one;
return(param);
}
public void Apply(RenderTexture targetRt, GTextureFilterParams param)
{
GHydraulicErosionParams erosionParam = param.HydraulicErosion;
RenderTexture writeRt = null; //buffer to write to
RenderTexture readRt = null; //buffer to read from
RenderTexture tmp = null; //temp buffer for swapping
CloneBg(targetRt, out writeRt, out readRt);
//init height field & water level
Mat.SetTexture("_HeightMap", targetRt);
GCommon.DrawQuad(writeRt, GCommon.FullRectUvPoints, Mat, 0);
GCommon.DrawQuad(readRt, GCommon.FullRectUvPoints, Mat, 0);
//simulate
for (int i = 0; i < erosionParam.Iteration; ++i)
{
Mat.SetTexture("_HeightMap", readRt);
Mat.SetVector("_Dimension", erosionParam.Dimension);
Mat.SetFloat("_Rain", erosionParam.Rain);
Mat.SetFloat("_Transportation", erosionParam.Transportation);
Mat.SetFloat("_MinAngle", erosionParam.AngleMin);
Mat.SetFloat("_Evaporation", erosionParam.Evaporation);
Mat.SetTexture("_WaterSourceMap", erosionParam.WaterSourceMap);
Mat.SetTexture("_HardnessMap", erosionParam.HardnessMap);
//Mat.SetFloat("_Seed", Random.value);
GCommon.DrawQuad(writeRt, GCommon.FullRectUvPoints, Mat, 1);
//swap buffer
tmp = readRt;
readRt = writeRt;
writeRt = tmp;
}
//copy result
GCommon.CopyToRT(writeRt, targetRt);
}