src/rt/m_mirror.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 * Routines for mirror material supporting virtual light sources
 */

/* ====================================================================
 * 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  "otypes.h"

#include  "source.h"

/*
 * The real arguments for MAT_MIRROR are simply:
 *
 *      3 rrefl grefl brefl
 *
 * Additionally, the user may specify a single string argument
 * which is interpreted as the name of the material to use
 * instead of the mirror if the ray being considered is not
 * part of the direct calculation.
 */


static int  mir_proj(), mirrorproj();

VSMATERIAL  mirror_vs = {mir_proj, 1};


int
m_mirror(m, r)                  /* shade mirrored ray */
register OBJREC  *m;
register RAY  *r;
{
        COLOR  mcolor;
        RAY  nr;
        int  rpure = 1;
        register int  i;
                                        /* check arguments */
        if (m->oargs.nfargs != 3 || m->oargs.nsargs > 1)
                objerror(m, USER, "bad number of arguments");
                                        /* check for substitute material */
        if (m->oargs.nsargs > 0 &&
                        (r->rsrc < 0 || source[r->rsrc].so != r->ro)) {
                if (!strcmp(m->oargs.sarg[0], VOIDID)) {
                        raytrans(r);
                        return(1);
                }
                return(rayshade(r, lastmod(objndx(m), m->oargs.sarg[0])));
        }
                                        /* check for bad source ray */
        if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
                return(1);

        if (r->rod < 0.)                /* back is black */
                return(1);
                                        /* get modifiers */
        raytexture(r, m->omod);
                                        /* assign material color */
        setcolor(mcolor, m->oargs.farg[0],
                        m->oargs.farg[1],
                        m->oargs.farg[2]);
        multcolor(mcolor, r->pcol);
                                        /* compute reflected ray */
        if (r->rsrc >= 0) {                     /* relayed light source */
                rayorigin(&nr, r, REFLECTED, 1.);
                                        /* ignore textures */
                for (i = 0; i < 3; i++)
                        nr.rdir[i] = r->rdir[i] + 2.*r->rod*r->ron[i];
                                        /* source we're aiming for next */
                nr.rsrc = source[r->rsrc].sa.sv.sn;
        } else {                                /* ordinary reflection */
                FVECT  pnorm;
                double  pdot;

                if (rayorigin(&nr, r, REFLECTED, bright(mcolor)) < 0)
                        return(1);
                if (DOT(r->pert,r->pert) > FTINY*FTINY) {
                        pdot = raynormal(pnorm, r);     /* use textures */
                        for (i = 0; i < 3; i++)
                                nr.rdir[i] = r->rdir[i] + 2.*pdot*pnorm[i];
                        rpure = 0;
                }
                                                /* check for penetration */
                if (rpure || DOT(nr.rdir, r->ron) <= FTINY)
                        for (i = 0; i < 3; i++)
                                nr.rdir[i] = r->rdir[i] + 2.*r->rod*r->ron[i];
        }
        rayvalue(&nr);
        multcolor(nr.rcol, mcolor);
        addcolor(r->rcol, nr.rcol);
        if (rpure && r->ro != NULL && isflat(r->ro->otype))
                r->rt = r->rot + nr.rt;
        return(1);
}


static int
mir_proj(pm, o, s, n)           /* compute a mirror's projection */
MAT4  pm;
register OBJREC  *o;
SRCREC  *s;
int  n;
{
        FVECT  nv, sc;
        double  od;
        register int  i, j;
                                /* get surface normal and offset */
        od = getplaneq(nv, o);
                                /* check for extreme point for behind */
        VCOPY(sc, s->sloc);
        for (i = s->sflags & SFLAT ? SV : SW; i >= 0; i--)
                if (DOT(nv, s->ss[i]) > 0.)
                        for (j = 0; j < 3; j++)
                                sc[j] += s->ss[i][j];
                else
                        for (j = 0; j < 3; j++)
                                sc[j] -= s->ss[i][j];
        if (DOT(sc, nv) <= (s->sflags & SDISTANT ? FTINY : od+FTINY))
                return(0);
                                /* everything OK -- compute projection */
        mirrorproj(pm, nv, od);
        return(1);
}


static int
mirrorproj(m, nv, offs)         /* get mirror projection for surface */
register MAT4  m;
FVECT  nv;
double  offs;
{
        register int  i, j;
                                        /* assign matrix */
        setident4(m);
        for (j = 0; j < 3; j++) {
                for (i = 0; i < 3; i++)
                        m[i][j] -= 2.*nv[i]*nv[j];
                m[3][j] = 2.*offs*nv[j];
        }
}
Revision:	2.8
Committed:	Sat Feb 22 02:07:28 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.7:	+63 -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
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* Routines for mirror material supporting virtual light sources
6	*/
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	*
59	* 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	*/
64
65	#include "ray.h"
66
67	#include "otypes.h"
68
69	#include "source.h"
70
71	/*
72	* The real arguments for MAT_MIRROR are simply:
73	*
74	* 3 rrefl grefl brefl
75	*
76	* Additionally, the user may specify a single string argument
77	* which is interpreted as the name of the material to use
78	* instead of the mirror if the ray being considered is not
79	* part of the direct calculation.
80	*/
81
82
83	static int mir_proj(), mirrorproj();
84
85	VSMATERIAL mirror_vs = {mir_proj, 1};
86
87
88	int
89	m_mirror(m, r) /* shade mirrored ray */
90	register OBJREC *m;
91	register RAY *r;
92	{
93	COLOR mcolor;
94	RAY nr;
95	int rpure = 1;
96	register int i;
97	/* check arguments */
98	if (m->oargs.nfargs != 3 \|\| m->oargs.nsargs > 1)
99	objerror(m, USER, "bad number of arguments");
100	/* check for substitute material */
101	if (m->oargs.nsargs > 0 &&
102	(r->rsrc < 0 \|\| source[r->rsrc].so != r->ro)) {
103	if (!strcmp(m->oargs.sarg[0], VOIDID)) {
104	raytrans(r);
105	return(1);
106	}
107	return(rayshade(r, lastmod(objndx(m), m->oargs.sarg[0])));
108	}
109	/* check for bad source ray */
110	if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
111	return(1);
112
113	if (r->rod < 0.) /* back is black */
114	return(1);
115	/* get modifiers */
116	raytexture(r, m->omod);
117	/* assign material color */
118	setcolor(mcolor, m->oargs.farg[0],
119	m->oargs.farg[1],
120	m->oargs.farg[2]);
121	multcolor(mcolor, r->pcol);
122	/* compute reflected ray */
123	if (r->rsrc >= 0) { /* relayed light source */
124	rayorigin(&nr, r, REFLECTED, 1.);
125	/* ignore textures */
126	for (i = 0; i < 3; i++)
127	nr.rdir[i] = r->rdir[i] + 2.r->rodr->ron[i];
128	/* source we're aiming for next */
129	nr.rsrc = source[r->rsrc].sa.sv.sn;
130	} else { /* ordinary reflection */
131	FVECT pnorm;
132	double pdot;
133
134	if (rayorigin(&nr, r, REFLECTED, bright(mcolor)) < 0)
135	return(1);
136	if (DOT(r->pert,r->pert) > FTINY*FTINY) {
137	pdot = raynormal(pnorm, r); /* use textures */
138	for (i = 0; i < 3; i++)
139	nr.rdir[i] = r->rdir[i] + 2.pdotpnorm[i];
140	rpure = 0;
141	}
142	/* check for penetration */
143	if (rpure \|\| DOT(nr.rdir, r->ron) <= FTINY)
144	for (i = 0; i < 3; i++)
145	nr.rdir[i] = r->rdir[i] + 2.r->rodr->ron[i];
146	}
147	rayvalue(&nr);
148	multcolor(nr.rcol, mcolor);
149	addcolor(r->rcol, nr.rcol);
150	if (rpure && r->ro != NULL && isflat(r->ro->otype))
151	r->rt = r->rot + nr.rt;
152	return(1);
153	}
154
155
156	static int
157	mir_proj(pm, o, s, n) /* compute a mirror's projection */
158	MAT4 pm;
159	register OBJREC *o;
160	SRCREC *s;
161	int n;
162	{
163	FVECT nv, sc;
164	double od;
165	register int i, j;
166	/* get surface normal and offset */
167	od = getplaneq(nv, o);
168	/* check for extreme point for behind */
169	VCOPY(sc, s->sloc);
170	for (i = s->sflags & SFLAT ? SV : SW; i >= 0; i--)
171	if (DOT(nv, s->ss[i]) > 0.)
172	for (j = 0; j < 3; j++)
173	sc[j] += s->ss[i][j];
174	else
175	for (j = 0; j < 3; j++)
176	sc[j] -= s->ss[i][j];
177	if (DOT(sc, nv) <= (s->sflags & SDISTANT ? FTINY : od+FTINY))
178	return(0);
179	/* everything OK -- compute projection */
180	mirrorproj(pm, nv, od);
181	return(1);
182	}
183
184
185	static int
186	mirrorproj(m, nv, offs) /* get mirror projection for surface */
187	register MAT4 m;
188	FVECT nv;
189	double offs;
190	{
191	register int i, j;
192	/* assign matrix */
193	setident4(m);
194	for (j = 0; j < 3; j++) {
195	for (i = 0; i < 3; i++)
196	m[i][j] -= 2.nv[i]nv[j];
197	m[3][j] = 2.offsnv[j];
198	}
199	}