/usr/share/radiance/surf.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 15 16 17 18 | { SCCSid "@(#)surf.cal 2.2 7/9/98 LBL" }
{
surf.cal - calculation of interpolated surface normal
A1 - dominant axis (we use the other two)
A2 A3 A4 \
A5 A6 A7 \ normal perturbation vector matrix
A8 A9 A10 / multiplied by [u*v u v 1] for perturbation
A11 A12 A13 /
}
surf_u = select(arg(1)+1, Py, Pz, Px);
surf_v = select(arg(1)+1, Pz, Px, Py);
surf_dx = surf_u*surf_v*arg(2) + surf_u*arg(5) + surf_v*arg(8) + arg(11);
surf_dy = surf_u*surf_v*arg(3) + surf_u*arg(6) + surf_v*arg(9) + arg(12);
surf_dz = surf_u*surf_v*arg(4) + surf_u*arg(7) + surf_v*arg(10) + arg(13);
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