/usr/share/radiance/rev.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 | { RCSid: $Id: rev.cal,v 2.3 2003/02/22 02:07:24 greg Exp $ }
{
Phong normal interpolation for surfaces of revolution about z.
11/7/88
(A1,A2) = (Mz,Bz)
(A3,A4) = (Mr,Br)
}
rev_dr = rev_rad*A3 + A4;
rev_rad = sqrt(Px*Px + Py*Py);
rev_dx = rev_dr * Px/rev_rad;
rev_dy = rev_dr * Py/rev_rad;
rev_dz = Pz*A1 + A2;
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