/usr/share/radiance/gloss.cal is in radiance-materials 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | {
Rough surface texture for anisotropic materials.
A1 - RMS facet slope (roughness) in x.
A2 - roughness in y.
A3 - roughness in z.
}
gloss_dx = A1*nrand(Px*.9113+Py*.3697+Pz*.4468);
gloss_dy = A2*nrand(Px*.85875+Py*.1521+Pz*.1782);
gloss_dz = A3*nrand(Px*.5992+Py*.7961+Pz*.3213);
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