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/* Copyright (c) 1995 Regents of the University of California */ |
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/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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{ |
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FVECT pt, tdir, odir; |
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double d; |
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register int i; |
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if (pos[2] <= 0) /* empty pixel */ |
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return(0); |
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return(0); |
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if (!averaging) |
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return(1); |
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if (ourview.type == VT_PAR) /* compute our direction */ |
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VCOPY(odir, ourview.vdir); |
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else |
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for (i = 0; i < 3; i++) |
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odir[i] = (pt[i] - ourview.vp[i])/pos[2]; |
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d = DOT(odir,tdir); /* compute pixel weight */ |
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if (d >= 1.-1./MAXWT/MAXWT) |
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/* compute pixel weight */ |
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if (ourview.type == VT_PAR) { |
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d = DOT(ourview.vdir,tdir); |
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d = 1. - d*d; |
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} else { |
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VSUB(odir, pt, ourview.vp); |
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d = DOT(odir,tdir); |
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d = 1. - d*d/DOT(odir,odir); |
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} |
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if (d <= 1./MAXWT/MAXWT) |
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return(MAXWT); /* clip to maximum weight */ |
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return(1./sqrt(1.-d)); |
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return(1./sqrt(d)); |
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} |
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