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Comparing ray/src/cv/source.cal (file contents):
Revision 2.4 by greg, Wed Oct 14 13:21:09 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;

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