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root/radiance/ray/src/gen/surf.cal
Revision: 1.1
Committed: Thu Aug 22 08:49:45 1991 UTC (32 years, 7 months ago) by greg
Branch: MAIN
Log Message:
Initial revision

File Contents

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