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greg |
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/* Copyright (c) 1988 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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#endif
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/*
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* mx_func.c - routine for mixture functions.
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*
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* 11/2/88
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*/
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#include "ray.h"
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/*
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* A mixture function is specified:
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*
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* modifier mixfunc name
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* 4+ foremod backmod varname vfname xf
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* 0
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* n A1 A2 ..
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*
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* Vfname is the name of the file where the variable definition
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* can be found. The list of real arguments can be accessed by
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* definitions in the file. The xf is a transformation
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* to get from the original coordinates to the current coordinates.
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*/
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mx_func(m, r) /* compute mixture function */
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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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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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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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for (i = 0; i < 2; i++)
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if (!strcmp(sa[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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objerror(m, USER, errmsg);
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}
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greg |
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funcfile(sa[3]);
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greg |
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errno = 0;
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coef = varvalue(sa[2]);
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if (errno) {
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objerror(m, WARNING, "compute error");
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return;
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}
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raymixture(r, mod[0], mod[1], coef);
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}
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