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greg |
1.1 |
#ifndef lint
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schorsch |
2.8 |
static const char RCSid[] = "$Id: mx_func.c,v 2.7 2003/03/05 16:16:53 greg Exp $";
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greg |
1.1 |
#endif
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/*
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* mx_func.c - routine for mixture functions.
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greg |
2.5 |
*/
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greg |
2.6 |
#include "copyright.h"
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greg |
1.1 |
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#include "ray.h"
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greg |
2.2 |
#include "func.h"
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schorsch |
2.8 |
#include "rtotypes.h"
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greg |
2.2 |
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greg |
1.1 |
/*
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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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schorsch |
2.8 |
extern int
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mx_func( /* compute mixture function */
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register OBJREC *m,
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RAY *r
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)
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greg |
1.1 |
{
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gwlarson |
2.4 |
OBJECT obj;
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greg |
1.1 |
register int i;
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double coef;
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OBJECT mod[2];
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greg |
2.2 |
register MFUNC *mf;
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greg |
1.1 |
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if (m->oargs.nsargs < 4)
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objerror(m, USER, "bad # arguments");
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gwlarson |
2.4 |
obj = objndx(m);
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greg |
1.1 |
for (i = 0; i < 2; i++)
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greg |
2.2 |
if (!strcmp(m->oargs.sarg[i], VOIDID))
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greg |
1.1 |
mod[i] = OVOID;
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gwlarson |
2.4 |
else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
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greg |
2.2 |
sprintf(errmsg, "undefined modifier \"%s\"",
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m->oargs.sarg[i]);
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greg |
1.1 |
objerror(m, USER, errmsg);
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}
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greg |
2.2 |
mf = getfunc(m, 3, 0x4, 0);
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setfunc(m, r);
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greg |
1.1 |
errno = 0;
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greg |
2.2 |
coef = evalue(mf->ep[0]);
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greg |
2.7 |
if (errno == EDOM || errno == ERANGE) {
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greg |
1.1 |
objerror(m, WARNING, "compute error");
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greg |
2.3 |
return(0);
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greg |
1.1 |
}
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greg |
2.3 |
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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greg |
1.1 |
}
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