/// <summary>
/// Load the resources.
/// </summary>
/// <remarks>Remember to call the base implementation of this method.</remarks>
protected override void LoadContent()
{
Texture texture = RgbmHelper.ConvertHdrTextureToRgbmOnlyRgb(new Texture("CubeTextures\\Desert-15_XXLResize"), 17);
var stream = new FileStream("Desert-15_XXLResizeRGB.jpg", FileMode.OpenOrCreate);
texture.Resource.SaveAsJpeg(stream, texture.Width, texture.Height);
texture = RgbmHelper.ConvertHdrTextureToRgbmOnlyM(new Texture("CubeTextures\\Desert-15_XXLResize"), 17);
stream = new FileStream("Desert-15_XXLResizeM.jpg", FileMode.OpenOrCreate);
texture.Resource.SaveAsJpeg(stream, texture.Width, texture.Height);
} // Load
} // GetWeightedAverageLightInputFromSphere
private static SphericalHarmonicL2 ExtractSphericalHarmonicForCubeFace(Matrix faceTransform, Color[] colorDataRgb, int faceSize, bool isRgbm, float rgbmMaxRange)
{
SphericalHarmonicL2 sh = new SphericalHarmonicL2();
// For each pixel in the face, generate it's SH contribution.
// Treat each pixel in the cube as a light source, which gets added to the SH.
// This is used to generate an indirect lighting SH for the scene.
float directionStep = 2.0f / (faceSize - 1.0f);
int pixelIndex = 0;
float dirY = 1.0f;
for (int y = 0; y < faceSize; y++)
{
SphericalHarmonicL2 lineSh = new SphericalHarmonicL2();
float dirX = -1.0f;
for (int x = 0; x < faceSize; x++)
{
// The direction to the pixel in the cube.
Vector3 direction = new Vector3(dirX, dirY, 1);
Vector3.TransformNormal(ref direction, ref faceTransform, out direction);
// Length of the direction vector.
float length = direction.Length();
// Approximate area of the pixel (pixels close to the cube edges appear smaller when projected).
float weight = 1.0f / length;
direction.Normalize();
Vector3 rgbFloat;
if (isRgbm)
{
Color rgbm = colorDataRgb[pixelIndex++];
rgbFloat = RgbmHelper.RgbmGammaToFloatLinear(rgbm, rgbmMaxRange);
}
else
{
Color rgb = colorDataRgb[pixelIndex++];
rgbFloat = new Vector3(GammaLinearSpaceHelper.GammaToLinear(rgb).X, GammaLinearSpaceHelper.GammaToLinear(rgb).Y, GammaLinearSpaceHelper.GammaToLinear(rgb).Z);
}
//Add it to the SH
lineSh.AddLight(rgbFloat, direction, weight);
dirX += directionStep;
}
// Average the SH.
if (lineSh.weighting > 0)
{
lineSh *= 1 / lineSh.weighting;
}
// Add the line to the full SH
// (SH is generated line by line to ease problems with floating point accuracy loss)
sh += lineSh;
dirY -= directionStep;
}
// Average the SH.
if (sh.weighting > 0)
{
sh *= 1 / sh.weighting;
}
return(sh);
} // ExtractSphericalHarmonicForCubeFace
