float dot_to_alpha(float dot) { float f = 1.0f - MathUtil.WyvillFalloff(dot, AlphaCutoff, 1.0f); //float f = MathUtil.WyvillRise01(dot); //if (f < AlphaCutoff) f = 0; return(MathUtil.Clamp(f, 0.0f, 1.0f)); }