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/* Copyright (c) 1992 Regents of the University of California */ |
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/* Copyright (c) 1995 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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chanvalue(n) /* return channel n to calcomp */ |
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register int n; |
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{ |
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double sum; |
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register RAY *r; |
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if (fray == NULL) |
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syntax("ray parameter used in constant expression"); |
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fray->rop[2]*funcxf.xfm[2][n-6] + |
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funcxf.xfm[3][n-6] ); |
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if (n == 9) { /* total distance */ |
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sum = fray->rot; |
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for (r = fray->parent; r != NULL; r = r->parent) |
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sum += r->rot; |
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return(sum * funcxf.sca); |
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if (n == 9) /* total distance */ |
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return(raydist(fray,PRIMARY) * funcxf.sca); |
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} |
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if (n == 10) /* dot product (range [-1,1]) */ |
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return( fray->rod <= -1.0 ? -1.0 : |
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fray->rod >= 1.0 ? 1.0 : |
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if (n < 24) /* k unit vector */ |
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return(funcxf.xfm[2][n-21] / funcxf.sca); |
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if (n == 24) { /* single ray (shadow) distance */ |
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sum = fray->rot; |
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for (r = fray->parent; r != NULL && r->crtype&SHADOW; |
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r = r->parent) |
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sum += r->rot; |
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return(sum * funcxf.sca); |
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} |
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if (n == 24) /* single ray (shadow) distance */ |
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return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca); |
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badchan: |
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error(USER, "illegal channel number"); |
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} |
