/usr/share/radiance/wrinkle.cal is in radiance-materials 4R1+20120125-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | {
A texture function for wrinkled materials.
11/23/93 Greg Ward
A1 - average rise of wrinkles
A2 - average run of wrinkles
A3 - average spacing of wrinkles
}
diri = noise3(Px/A2/3,Py/A2/3,Pz/A2/3);
mx = Sqrt(-diri);
my = Sqrt(1-abs(diri));
mz = Sqrt(diri);
xwrink = Rdot*A1/A3*mx*fnoise3(Px/A3,Py/A2,Pz/A2);
ywrink = Rdot*A1/A3*my*fnoise3(Px/A2,Py/A3,Pz/A2);
zwrink = Rdot*A1/A3*mz*fnoise3(Py/A2,Py/A2,Pz/A3);
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