/usr/share/radiance/dirt.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 | {
Dirt pattern.
This is probably the simplest application
imaginable for the fractal noise function.
A1 - degree of "dirtiness"; 1 is very dirty.
}
dirt = 1 - A1*.5*(1+fnoise3(Px,Py,Pz));
|