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);
	}