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Comparing ray/src/rt/aniso.c (file contents):
Revision 2.68 by greg, Fri Dec 20 16:29:50 2024 UTC vs.
Revision 2.69 by greg, Fri May 23 17:09:26 2025 UTC

# Line 324 | Line 324 | getacoords(            /* set up coordinate system */
324          if (normalize(np->v) == 0.0) {
325                  if (fabs(np->u_alpha - np->v_alpha) > 0.001)
326                          objerror(np->mp, WARNING, "illegal orientation vector");
327 <                getperpendicular(np->u, np->pnorm, 1);  /* punting */
327 >                getperpendicular(np->u, np->pnorm, 0);  /* punting */
328                  fcross(np->v, np->pnorm, np->u);
329                  np->u_alpha = np->v_alpha = sqrt( 0.5 *
330                          (np->u_alpha*np->u_alpha + np->v_alpha*np->v_alpha) );

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