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root/Development/ray/src/px/pinterp.c
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Comparing ray/src/px/pinterp.c (file contents):
Revision 2.31 by gwlarson, Tue Oct 27 09:08:26 1998 UTC vs.
Revision 2.32 by gwlarson, Fri Jul 16 16:11:31 1999 UTC

# Line 1 | Line 1
1 < /* Copyright (c) 1995 Regents of the University of California */
1 > /* Copyright (c) 1999 Silicon Graphics, Inc. */
2  
3   #ifndef lint
4 < static char SCCSid[] = "$SunId$ LBL";
4 > static char SCCSid[] = "$SunId$ SGI";
5   #endif
6  
7   /*
# Line 674 | Line 674 | register FVECT pos;
674   {
675          FVECT   pt, tdir, odir;
676          double  d;
677 –        register int    i;
677          
678          if (pos[2] <= 0)                /* empty pixel */
679                  return(0);
# Line 719 | Line 718 | register FVECT pos;
718                  return(0);
719          if (!averaging)
720                  return(1);
721 <        if (ourview.type == VT_PAR)             /* compute our direction */
722 <                VCOPY(odir, ourview.vdir);
723 <        else
724 <                for (i = 0; i < 3; i++)
725 <                        odir[i] = (pt[i] - ourview.vp[i])/pos[2];
726 <        d = DOT(odir,tdir);                     /* compute pixel weight */
727 <        if (d >= 1.-1./MAXWT/MAXWT)
721 >                                                /* compute pixel weight */
722 >        if (ourview.type == VT_PAR) {
723 >                d = DOT(ourview.vdir,tdir);
724 >                d = 1. - d*d;
725 >        } else {
726 >                VSUB(odir, pt, ourview.vp);
727 >                d = DOT(odir,tdir);
728 >                d = 1. - d*d/DOT(odir,odir);
729 >        }
730 >        if (d <= 1./MAXWT/MAXWT)
731                  return(MAXWT);          /* clip to maximum weight */
732 <        return(1./sqrt(1.-d));
732 >        return(1./sqrt(d));
733   }
734  
735  

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