/usr/share/radiance/slate.cal is in radiance-materials 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o644.
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Slate texture
Aligned in direction of x-axis
2/8/91
}
slate_dx = .5*Rdot * (.1*fnoise3(-Px/10,Py,Pz)
+ if(noise3(Px/10,Py,Pz)+.8,0,noise3a(Px/10,Py,Pz)));
slate_dy = .5*Rdot * (.1*fnoise3(Px/10,-Py,Pz)
+ if(noise3(Px/10,Py,Pz)+.8,0,noise3b(Px/10,Py,Pz)));
slate_dz = .5*Rdot * (.1*fnoise3(Px/10,Py,-Pz)
+ if(noise3(Px/10,Py,Pz)+.8,0,noise3c(Px/10,Py,Pz)));
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