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mx_func.c
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Thu, Jun 27, 03:31
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text/x-c
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Sat, Jun 29, 03:31 (2 d)
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R10977 RADIANCE Photon Map
mx_func.c
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#ifndef lint
static const char RCSid[] = "$Id: mx_func.c,v 2.9 2014/07/08 18:25:00 greg Exp $";
#endif
/*
* mx_func.c - routine for mixture functions.
*/
#include "copyright.h"
#include "ray.h"
#include "func.h"
#include "rtotypes.h"
/*
* A mixture function is specified:
*
* modifier mixfunc name
* 4+ foremod backmod varname vfname xf
* 0
* n A1 A2 ..
*
* Vfname is the name of the file where the variable definition
* can be found. The list of real arguments can be accessed by
* definitions in the file. The xf is a transformation
* to get from the original coordinates to the current coordinates.
*/
int
mx_func( /* compute mixture function */
OBJREC *m,
RAY *r
)
{
OBJECT obj;
int i;
double coef;
OBJECT mod[2];
MFUNC *mf;
if (m->oargs.nsargs < 4)
objerror(m, USER, "bad # arguments");
obj = objndx(m);
for (i = 0; i < 2; i++)
if (!strcmp(m->oargs.sarg[i], VOIDID))
mod[i] = OVOID;
else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
sprintf(errmsg, "undefined modifier \"%s\"",
m->oargs.sarg[i]);
objerror(m, USER, errmsg);
}
mf = getfunc(m, 3, 0x4, 0);
setfunc(m, r);
errno = 0;
coef = evalue(mf->ep[0]);
if (errno == EDOM || errno == ERANGE) {
objerror(m, WARNING, "compute error");
return(0);
}
if (raymixture(r, mod[0], mod[1], coef)) {
if (m->omod != OVOID)
objerror(m, USER, "inappropriate modifier");
return(1);
}
return(0);
}
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