public static float?CalculateSmoothLight(SubsystemTerrain subsystemTerrain, Vector3 p)
{
p -= new Vector3(0.5f);
int num = (int)MathUtils.Floor(p.X);
int num2 = (int)MathUtils.Floor(p.Y);
int num3 = (int)MathUtils.Floor(p.Z);
int x = (int)MathUtils.Ceiling(p.X);
int num4 = (int)MathUtils.Ceiling(p.Y);
int z = (int)MathUtils.Ceiling(p.Z);
Terrain terrain = subsystemTerrain.Terrain;
if (num2 >= 0 && num4 <= 255)
{
TerrainChunk chunkAtCell = terrain.GetChunkAtCell(num, num3);
TerrainChunk chunkAtCell2 = terrain.GetChunkAtCell(x, num3);
TerrainChunk chunkAtCell3 = terrain.GetChunkAtCell(num, z);
TerrainChunk chunkAtCell4 = terrain.GetChunkAtCell(x, z);
if (chunkAtCell != null && chunkAtCell.State >= TerrainChunkState.InvalidVertices1 && chunkAtCell2 != null && chunkAtCell2.State >= TerrainChunkState.InvalidVertices1 && chunkAtCell3 != null && chunkAtCell3.State >= TerrainChunkState.InvalidVertices1 && chunkAtCell4 != null && chunkAtCell4.State >= TerrainChunkState.InvalidVertices1)
{
float f = p.X - (float)num;
float f2 = p.Y - (float)num2;
float f3 = p.Z - (float)num3;
float x2 = terrain.GetCellLightFast(num, num2, num3);
float x3 = terrain.GetCellLightFast(num, num2, z);
float x4 = terrain.GetCellLightFast(num, num4, num3);
float x5 = terrain.GetCellLightFast(num, num4, z);
float x6 = terrain.GetCellLightFast(x, num2, num3);
float x7 = terrain.GetCellLightFast(x, num2, z);
float x8 = terrain.GetCellLightFast(x, num4, num3);
float x9 = terrain.GetCellLightFast(x, num4, z);
float x10 = MathUtils.Lerp(x2, x6, f);
float x11 = MathUtils.Lerp(x3, x7, f);
float x12 = MathUtils.Lerp(x4, x8, f);
float x13 = MathUtils.Lerp(x5, x9, f);
float x14 = MathUtils.Lerp(x10, x12, f2);
float x15 = MathUtils.Lerp(x11, x13, f2);
float num5 = MathUtils.Lerp(x14, x15, f3);
int num6 = (int)MathUtils.Floor(num5);
int num7 = (int)MathUtils.Ceiling(num5);
float f4 = num5 - (float)num6;
return(MathUtils.Lerp(LightIntensityByLightValue[num6], LightIntensityByLightValue[num7], f4));
}
}
return(null);
}