src/rt/t_func.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  t_func.c - routine for procedural textures.
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#include  "ray.h"

#include  "func.h"

/*
 *      A procedural texture perturbs the surface normal
 *  at the point of intersection with an object.  It has
 *  the form:
 *
 *      modifier texfunc name
 *      4+ xvarname yvarname zvarname filename xf
 *      0
 *      n A1 A2 ..
 *
 *  Filename is the name of the file where the variable definitions
 *  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.
 */


t_func(m, r)                    /* compute texture for ray */
register OBJREC  *m;
register RAY  *r;
{
        FVECT  disp;
        double  d;
        register MFUNC  *mf;
        register int  i;

        if (m->oargs.nsargs < 4)
                objerror(m, USER, "bad # arguments");
        mf = getfunc(m, 3, 0x7, 1);
        setfunc(m, r);
        errno = 0;
        for (i = 0; i < 3; i++) {
                disp[i] = evalue(mf->ep[i]);
                if (errno) {
                        objerror(m, WARNING, "compute error");
                        return(0);
                }
        }
        if (mf->f != &unitxf)
                multv3(disp, disp, mf->f->xfm);
        if (r->rox != NULL) {
                multv3(disp, disp, r->rox->f.xfm);
                d = 1.0 / (mf->f->sca * r->rox->f.sca);
        } else
                d = 1.0 / mf->f->sca;
        for (i = 0; i < 3; i++)
                r->pert[i] += disp[i] * d;
        return(0);
}
Revision:	2.4
Committed:	Sat Feb 22 02:07:29 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.3:	+57 -5 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.4	static const char RCSid[] = "$Id$";
3	greg	1.1	#endif
4			/*
5			* t_func.c - routine for procedural textures.
6	greg	2.4	*/
7
8			/* ====================================================================
9			* The Radiance Software License, Version 1.0
10			*
11			* Copyright (c) 1990 - 2002 The Regents of the University of California,
12			* through Lawrence Berkeley National Laboratory. All rights reserved.
13			*
14			* Redistribution and use in source and binary forms, with or without
15			* modification, are permitted provided that the following conditions
16			* are met:
17			*
18			* 1. Redistributions of source code must retain the above copyright
19			* notice, this list of conditions and the following disclaimer.
20			*
21			* 2. Redistributions in binary form must reproduce the above copyright
22			* notice, this list of conditions and the following disclaimer in
23			* the documentation and/or other materials provided with the
24			* distribution.
25			*
26			* 3. The end-user documentation included with the redistribution,
27			* if any, must include the following acknowledgment:
28			* "This product includes Radiance software
29			* (http://radsite.lbl.gov/)
30			* developed by the Lawrence Berkeley National Laboratory
31			* (http://www.lbl.gov/)."
32			* Alternately, this acknowledgment may appear in the software itself,
33			* if and wherever such third-party acknowledgments normally appear.
34			*
35			* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
36			* and "The Regents of the University of California" must
37			* not be used to endorse or promote products derived from this
38			* software without prior written permission. For written
39			* permission, please contact [email protected].
40			*
41			* 5. Products derived from this software may not be called "Radiance",
42			* nor may "Radiance" appear in their name, without prior written
43			* permission of Lawrence Berkeley National Laboratory.
44			*
45			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
46			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
48			* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
49			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
50			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
51			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
52			* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
53			* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
54			* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
55			* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56			* SUCH DAMAGE.
57			* ====================================================================
58	greg	1.1	*
59	greg	2.4	* This software consists of voluntary contributions made by many
60			* individuals on behalf of Lawrence Berkeley National Laboratory. For more
61			* information on Lawrence Berkeley National Laboratory, please see
62			* <http://www.lbl.gov/>.
63	greg	1.1	*/
64
65			#include "ray.h"
66
67	greg	2.2	#include "func.h"
68
69	greg	1.1	/*
70			* A procedural texture perturbs the surface normal
71			* at the point of intersection with an object. It has
72			* the form:
73			*
74			* modifier texfunc name
75			* 4+ xvarname yvarname zvarname filename xf
76			* 0
77			* n A1 A2 ..
78			*
79			* Filename is the name of the file where the variable definitions
80			* can be found. The list of real arguments can be accessed by
81			* definitions in the file. The xf is a transformation to get
82			* from the original coordinates to the current coordinates.
83			*/
84
85
86			t_func(m, r) /* compute texture for ray */
87			register OBJREC *m;
88			register RAY *r;
89			{
90			FVECT disp;
91	greg	1.6	double d;
92	greg	2.2	register MFUNC *mf;
93	greg	1.1	register int i;
94
95			if (m->oargs.nsargs < 4)
96			objerror(m, USER, "bad # arguments");
97	greg	2.2	mf = getfunc(m, 3, 0x7, 1);
98			setfunc(m, r);
99	greg	1.1	errno = 0;
100	greg	2.2	for (i = 0; i < 3; i++) {
101			disp[i] = evalue(mf->ep[i]);
102			if (errno) {
103			objerror(m, WARNING, "compute error");
104	greg	2.3	return(0);
105	greg	2.2	}
106	greg	1.1	}
107	greg	2.2	if (mf->f != &unitxf)
108			multv3(disp, disp, mf->f->xfm);
109	greg	1.8	if (r->rox != NULL) {
110			multv3(disp, disp, r->rox->f.xfm);
111	greg	2.2	d = 1.0 / (mf->f->sca * r->rox->f.sca);
112	greg	1.8	} else
113	greg	2.2	d = 1.0 / mf->f->sca;
114	greg	1.4	for (i = 0; i < 3; i++)
115	greg	1.6	r->pert[i] += disp[i] * d;
116	greg	2.3	return(0);
117	greg	1.1	}