I used my own routine for generating it. Here it is:
It converts a 2^n + 1 height map to 2^n normal map by averaging the normals of the four corners of the pixel. It also loops the texture (when i = size -> i = 0)
int i, j, ci, cj; CVector3 vSum, v1, v2, v3; Img.Create(ImgSize - 1, ImgSize - 1, 3); CVector3* Normals; Normals = new CVector3[ImgSize * ImgSize]; for (i = 0; i < ImgSize; i++) { for (j = 0; j < ImgSize; j++) { vSum = CVector3(0, 0, 0); v1 = CVector3(i, SrcImg[i * ImgSize + j], j); ci = i - 1; cj = j; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v2 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); ci = i; cj = j + 1; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v3 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); vSum = vSum + Cross(v1 - v2, v1 - v3); ci = i; cj = j + 1; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v2 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); ci = i + 1; cj = j; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v3 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); vSum = vSum + Cross(v1 - v2, v1 - v3); ci = i + 1; cj = j; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v2 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); ci = i; cj = j - 1; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v3 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); vSum = vSum + Cross(v1 - v2, v1 - v3); ci = i; cj = j - 1; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v2 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); ci = i - 1; cj = j; ci = abs(ci % ImgSize); cj = abs(cj % ImgSize); v3 = CVector3(ci, SrcImg[ci * ImgSize + cj], cj); vSum = vSum + Cross(v2 - v1, v3 - v1); vSum = Normalize(vSum); Normals[i * ImgSize + j] = vSum; } } int Size = ImgSize - 1; for (i = 0; i < Size; i++) { for (j = 0; j < Size; j++) { vSum = Normals[i * ImgSize + j] + Normals[i * ImgSize + j + 1] + Normals[(i + 1) * ImgSize + j] + Normals[(i + 1) * ImgSize + j + 1]; vSum = Normalize(vSum); Img.PutPixel((i * Size + j) * 3 ,(BYTE)(vSum.x * 127.0f + 128)); Img.PutPixel((i * Size + j) * 3 + 1,(BYTE)(vSum.y * 127.0f + 128)); Img.PutPixel((i * Size + j) * 3 + 2,(BYTE)(vSum.z * 127.0f + 128)); } } delete [] Normals; Img.SaveToFile("data\\normal.bmp"); if (!built) { texnum = 0; while (GL.IsTexture(texnum)) texnum++; GL.GenTextures(1, &texnum); } GL.BindTexture(GL_TEXTURE_2D, texnum); GL.BuildMipmaps2D(GL_TEXTURE_2D, GL_RGB8, Size, Size, GL_RGB, GL_UNSIGNED_BYTE, Img.GetDataPointer()); GL.TextureParam(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); GL.TextureParam(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); GL.TextureParam(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); GL.TextureParam(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
I was thinking the same - the normals are screwed up - and i dont have that utility for generating normals, but i''ll search for it.
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