/usr/share/radiance/fisheye.cal is in radiance-materials 4R0+20110410-1build1.
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Calculate coordinates for a 180 degree fisheye lens.
Assume view direction is (0,1,0), view up (0,0,1), (1,0,0) right.
4/30/90
}
fish_u = .5 + Dx/fish_Rxz * fish_Ry;
fish_v = .5 + Dz/fish_Rxz * fish_Ry;
fish_Rxz = sqrt(Dx*Dx + Dz*Dz);
fish_Ry = acos(Dy) / PI;
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