/usr/share/radiance/woodpat.cal is in radiance-materials 4R0+20110410-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | {
Wood grain pattern:
A1 - magnitude (0 to 1)
}
xgrain = woodgrain(Ring(Py,Pz)); { along x axis }
ygrain = woodgrain(Ring(Px,Pz)); { along y axis }
zgrain = woodgrain(Ring(Px,Py)); { along z axis }
woodgrain(r) = hermite(.6-A1/2,.6+A1/2,2,.5,2*tri(r,.5));
Ring(a,b) = sqrt( 25 + sq(mod(a,50)-25) + sq(mod(b,50)-25)) +
7 * fnoise3(Px/40,Py/40,Pz/40) ;
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