protected override void Do(DynamicMesh mesh, int startMeshIndex, int vertexCount, PolyShape poly)
{
var s = new Vector2(texturesPerUnit * aspectRatio, texturesPerUnit);
for (int i = 0; i < vertexCount; i++)
{
int meshIndex = startMeshIndex + i;
mesh.SetUV(meshIndex, Vector2.Scale(s, useMeshVertex ? (Vector2)mesh.vertexes[meshIndex] : poly.positions[i]));
}
}
public void SetColor(int index, Color color, DynamicMesh mesh)
{
switch (mode)
{
case PaintMode.Replace:
mesh.SetColor(index, color);
break;
case PaintMode.AlphaBlending:
//https://en.wikipedia.org/wiki/Alpha_compositing
Color src = color;
Color dst = mesh.GetColor(index);
var out_a = src.a + dst.a * (1f - src.a);
var out_grba = (src * src.a + dst * dst.a * (1f - src.a)) / out_a;
out_grba.a = out_a;
mesh.SetColor(index, out_grba);
break;
default:
break;
}
}
protected abstract void Do(DynamicMesh mesh, int startMeshIndex, int vertexCount, PolyShape poly);
