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Comparing ray/src/gen/rev.cal (file contents):
Revision 1.1 by greg, Thu Aug 22 08:49:42 1991 UTC vs.
Revision 2.3 by greg, Sat Feb 22 02:07:24 2003 UTC

# Line 1 | Line 1
1 < { SCCSid "$SunId$ LBL" }
2 <
1 > { RCSid: $Id$ }
2   {
3          Phong normal interpolation for surfaces of revolution about z.
4  
# Line 9 | Line 8
8          (A3,A4) =       (Mr,Br)
9   }
10  
11 + rev_dr = rev_rad*A3 + A4;
12 + rev_rad = sqrt(Px*Px + Py*Py);
13 +
14   rev_dx = rev_dr * Px/rev_rad;
15   rev_dy = rev_dr * Py/rev_rad;
16   rev_dz = Pz*A1 + A2;
15 –
16 – rev_dr = rev_rad*A3 + A4;
17 – rev_rad = sqrt(Px*Px + Py*Py);

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