src/rt/mx_func.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  mx_func.c - routine for mixture functions.
 */

#include "copyright.h"

#include  "ray.h"

#include  "func.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.
 */


mx_func(m, r)                   /* compute mixture function */
register OBJREC  *m;
RAY  *r;
{
        OBJECT  obj;
        register int  i;
        double  coef;
        OBJECT  mod[2];
        register 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) {
                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);
}
Revision:	2.6
Committed:	Tue Feb 25 02:47:22 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+1 -56 lines
Log Message:	Replaced inline copyright notice with #include "copyright.h"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.5	static const char RCSid[] = "$Id$";
3	greg	1.1	#endif
4			/*
5			* mx_func.c - routine for mixture functions.
6	greg	2.5	*/
7
8	greg	2.6	#include "copyright.h"
9	greg	1.1
10			#include "ray.h"
11
12	greg	2.2	#include "func.h"
13
14	greg	1.1	/*
15			* A mixture function is specified:
16			*
17			* modifier mixfunc name
18			* 4+ foremod backmod varname vfname xf
19			* 0
20			* n A1 A2 ..
21			*
22			* Vfname is the name of the file where the variable definition
23			* can be found. The list of real arguments can be accessed by
24			* definitions in the file. The xf is a transformation
25			* to get from the original coordinates to the current coordinates.
26			*/
27
28
29			mx_func(m, r) /* compute mixture function */
30			register OBJREC *m;
31			RAY *r;
32			{
33	gwlarson	2.4	OBJECT obj;
34	greg	1.1	register int i;
35			double coef;
36			OBJECT mod[2];
37	greg	2.2	register MFUNC *mf;
38	greg	1.1
39			if (m->oargs.nsargs < 4)
40			objerror(m, USER, "bad # arguments");
41	gwlarson	2.4	obj = objndx(m);
42	greg	1.1	for (i = 0; i < 2; i++)
43	greg	2.2	if (!strcmp(m->oargs.sarg[i], VOIDID))
44	greg	1.1	mod[i] = OVOID;
45	gwlarson	2.4	else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
46	greg	2.2	sprintf(errmsg, "undefined modifier \"%s\"",
47			m->oargs.sarg[i]);
48	greg	1.1	objerror(m, USER, errmsg);
49			}
50	greg	2.2	mf = getfunc(m, 3, 0x4, 0);
51			setfunc(m, r);
52	greg	1.1	errno = 0;
53	greg	2.2	coef = evalue(mf->ep[0]);
54	greg	1.1	if (errno) {
55			objerror(m, WARNING, "compute error");
56	greg	2.3	return(0);
57	greg	1.1	}
58	greg	2.3	if (raymixture(r, mod[0], mod[1], coef)) {
59			if (m->omod != OVOID)
60			objerror(m, USER, "inappropriate modifier");
61			return(1);
62			}
63			return(0);
64	greg	1.1	}