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/* Copyright (c) 1988 Regents of the University of California */ |
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/* Copyright (c) 1998 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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#include "ray.h" |
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#include "func.h" |
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/* |
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* A mixture function is specified: |
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* |
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register OBJREC *m; |
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RAY *r; |
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{ |
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extern double varvalue(); |
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extern int errno; |
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OBJECT obj; |
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register int i; |
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double coef; |
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OBJECT mod[2]; |
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register char **sa; |
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register MFUNC *mf; |
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setfunc(m, r); |
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sa = m->oargs.sarg; |
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if (m->oargs.nsargs < 4) |
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objerror(m, USER, "bad # arguments"); |
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obj = objndx(m); |
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for (i = 0; i < 2; i++) |
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if (!strcmp(sa[i], VOIDID)) |
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if (!strcmp(m->oargs.sarg[i], VOIDID)) |
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mod[i] = OVOID; |
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else if ((mod[i] = modifier(sa[i])) == OVOID) { |
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sprintf(errmsg, "undefined modifier \"%s\"", sa[i]); |
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else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) { |
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sprintf(errmsg, "undefined modifier \"%s\"", |
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m->oargs.sarg[i]); |
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objerror(m, USER, errmsg); |
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} |
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funcfile(sa[3]); |
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mf = getfunc(m, 3, 0x4, 0); |
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setfunc(m, r); |
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errno = 0; |
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coef = varvalue(sa[2]); |
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coef = evalue(mf->ep[0]); |
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if (errno) { |
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objerror(m, WARNING, "compute error"); |
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return; |
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return(0); |
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} |
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raymixture(r, mod[0], mod[1], coef); |
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if (raymixture(r, mod[0], mod[1], coef)) { |
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if (m->omod != OVOID) |
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objerror(m, USER, "inappropriate modifier"); |
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return(1); |
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} |
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return(0); |
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} |
