private static float4 Sample2(sampler tex, float4 coords, float polar)
{
float4 tex1 = tex.SampleLevel(coords.xy);
float4 tex2 = tex.SampleLevel(coords.zw);
return(_lerp(tex1, tex2, polar));
}
private static float4 SampleSmooth(sampler tex, float2 coord, float2 size)
{
float2 pix = coord * size;
float2 sub = _floor(pix - 0.5f) + 0.5f;
float2 f = pix - sub;
f = _smoothstep(_float2(0.0f, 0.0f), _float2(1.0f, 1.0f), f);
return(tex.SampleLevel((sub + f) / size));
}
private static float GetHeightUV(float2 coord, float4 detailCoord)
{
float height = _Radius;
float4 heightMap = SampleSmooth(_HeightMap, coord, _HeightMapSize);
float4 maskMap = _MaskMap.SampleLevel(coord);
float polar = _saturate((_abs(coord.y - 0.5f) - 0.2f) * 30.0f);
height += Sample2(_DetailMapA, detailCoord, polar).w *maskMap.x *_DetailScaleA;
height += Sample2(_DetailMapB, detailCoord, polar).w *maskMap.y *_DetailScaleB;
height += heightMap.w * _HeightMapScale;
return(height);
}
