/usr/share/radiance/jigglepic.cal is in radiance-materials 4R0+20110410-1build1.
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Calculation of randomly jiggled 2d picture coordinates.
A1 - Degree of jiggleing.
A2 - Ratio of height to width for non-square tiles.
}
jigglepic_u = Px + A1*noise3(Px+8.7,Py-31.2,Pz+44.4);
jigglepic_v = Py + A1*noise3(Py-13.4,Py+11.7,Pz-33.8);
fjigglepic_u = Px + A1*fnoise3(Px+8.7,Py-31.2,Pz+44.4);
fjigglepic_v = Py + A1*fnoise3(Py-13.4,Py+11.7,Pz-33.8);
jiggletile_u = mod(jigglepic_u,max(1,1/jgpic_aspect));
jiggletile_v = mod(jigglepic_v,max(1,jgpic_aspect));
jigglematch_u = tri(jigglepic_u,max(1,1/jgpic_aspect));
jigglematch_v = tri(jigglepic_v,max(1,jgpic_aspect));
fjiggletile_u = mod(fjigglepic_u,max(1,1/jgpic_aspect));
fjiggletile_v = mod(fjigglepic_v,max(1,jgpic_aspect));
fjigglematch_u = tri(fjigglepic_u,max(1,1/jgpic_aspect));
fjigglematch_v = tri(fjigglepic_v,max(1,jgpic_aspect));
jgpic_aspect = if(arg(0)-1.5, arg(2), 1);
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