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Comparing ray/src/cv/source.cal (file contents):
Revision 2.3 by greg, Tue Aug 18 13:23:14 1992 UTC vs.
Revision 2.5 by greg, Wed Feb 24 10:24:58 1993 UTC

# Line 14 | Line 14
14          with a rectangular box.  lboxcorr provides a more
15          accurate calculation for nearby surfaces, but requires
16          that the source box be centered at the origin.
17 +        The dimensions of the box, which must be aligned with
18 +        the x,y,z axes, are given in meters regardless of the
19 +        units being used in the scene file.
20  
21          A1              - optional multipier
22 <        A2,A3,A4        - X,Y,Z dimensions of axis-aligned box
22 >        A2,A3,A4        - X,Y,Z dimensions of axis-aligned box (in meters!)
23   }
24                                          { local definitions }
25   boxprojection = abs(Dx)*A3*A4 + abs(Dy)*A2*A4 + abs(Dz)*A2*A3;
# Line 39 | Line 42 | src_phi4 = tri( src_phi, 90 );         { 0-90 }
42                                  { Type B photometry coordinates }
43   srcB_vert = atan( -Dx/Dz ) / DEGREE;
44   srcB_horiz = Asin(Dy) / DEGREE;
45 <                                { w/ bilateral symmetry }
45 >                                { w/ symmetry }
46 > srcB_vert2 = abs( srcB_vert );
47   srcB_horiz2 = abs( srcB_horiz );

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