/usr/share/radiance/fishgeom.cal is in radiance-materials 4R0+20110410-1build1.
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Calculate coordinates for a 180 degree fisheye lens onto local geom.
Assume view direction is (0,1,0), view up (0,0,1), (1,0,0) right.
View origin is (0,0,0).
11/21/2006 G. Ward
}
Fnorm = 1/sqrt(Px*Px + Py*Py + Pz*Pz);
FDx = Px*Fnorm;
FDy = Py*Fnorm;
FDz = Pz*Fnorm;
fish_Rxz = sqrt(FDx*FDx + FDz*FDz);
fish_Ry = acos(FDy) / PI;
fish_u = .5 + FDx/fish_Rxz * fish_Ry;
fish_v = .5 + FDz/fish_Rxz * fish_Ry;
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