/usr/share/radiance/cyl.cal is in radiance-materials 4R1+20120125-1.
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 12 13 14 15 16 17 18 19 20 | {
cyl.cal - 2d coordinate mapping onto cylinder.
Unit radius cylinder with axis along z.
A1 = picture height/width
A2 = unit scale for pattern
}
cyl_u = (atan2(Py,Px)+PI)/A2;
cyl_v = Pz/A2;
cyl_tile_u = mod(cyl_u,pic_width);
cyl_tile_v = mod(cyl_v,pic_height);
cyl_match_u = tri(cyl_u,pic_width);
cyl_match_v = tri(cyl_v,pic_height);
pic_width = max(1,1/A1);
pic_height = max(1,A1);
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