src/rt/o_instance.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  o_instance.c - routines for computing ray intersections with octrees.
 */

/* ====================================================================
 * 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  "instance.h"


o_instance(o, r)                /* compute ray intersection with octree */
OBJREC  *o;
register RAY  *r;
{
        RAY  rcont;
        register INSTANCE  *in;
        register int  i;
                                        /* get the octree */
        in = getinstance(o, IO_ALL);
                                        /* copy and transform ray */
        copystruct(&rcont, r);
        multp3(rcont.rorg, r->rorg, in->x.b.xfm);
        multv3(rcont.rdir, r->rdir, in->x.b.xfm);
        for (i = 0; i < 3; i++)
                rcont.rdir[i] /= in->x.b.sca;
        rcont.rmax *= in->x.b.sca;
                                        /* clear and trace it */
        rayclear(&rcont);
        if (!localhit(&rcont, &in->obj->scube))
                return(0);                      /* missed */
        if (rcont.rot * in->x.f.sca >= r->rot)
                return(0);                      /* not close enough */

        if (o->omod != OVOID) {         /* if we have modifier, use it */
                r->ro = o;
                r->rox = NULL;
        } else {                        /* else use theirs */
                r->ro = rcont.ro;
                if (rcont.rox != NULL) {
                        newrayxf(r);            /* allocate transformation */
                                        /* NOTE: r->rox may equal rcont.rox! */
                        multmat4(r->rox->f.xfm, rcont.rox->f.xfm, in->x.f.xfm);
                        r->rox->f.sca = rcont.rox->f.sca * in->x.f.sca;
                        multmat4(r->rox->b.xfm, in->x.b.xfm, rcont.rox->b.xfm);
                        r->rox->b.sca = in->x.b.sca * rcont.rox->b.sca;
                } else
                        r->rox = &in->x;
        }
                                        /* transform it back */
        r->rot = rcont.rot * in->x.f.sca;
        multp3(r->rop, rcont.rop, in->x.f.xfm);
        multv3(r->ron, rcont.ron, in->x.f.xfm);
        for (i = 0; i < 3; i++)
                r->ron[i] /= in->x.f.sca;
        r->rod = rcont.rod;
                                        /* return hit */
        return(1);
}
Revision:	2.4
Committed:	Sat Feb 22 02:07:29 2003 UTC (22 years, 8 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			* o_instance.c - routines for computing ray intersections with octrees.
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			#include "instance.h"
68
69
70			o_instance(o, r) /* compute ray intersection with octree */
71			OBJREC *o;
72			register RAY *r;
73			{
74			RAY rcont;
75			register INSTANCE *in;
76			register int i;
77			/* get the octree */
78	greg	1.6	in = getinstance(o, IO_ALL);
79	greg	2.3	/* copy and transform ray */
80	greg	1.7	copystruct(&rcont, r);
81	greg	1.8	multp3(rcont.rorg, r->rorg, in->x.b.xfm);
82			multv3(rcont.rdir, r->rdir, in->x.b.xfm);
83	greg	1.1	for (i = 0; i < 3; i++)
84	greg	1.8	rcont.rdir[i] /= in->x.b.sca;
85	greg	2.3	rcont.rmax *= in->x.b.sca;
86			/* clear and trace it */
87			rayclear(&rcont);
88	greg	1.1	if (!localhit(&rcont, &in->obj->scube))
89	greg	1.11	return(0); /* missed */
90	greg	1.8	if (rcont.rot * in->x.f.sca >= r->rot)
91	greg	1.11	return(0); /* not close enough */
92	greg	1.4
93			if (o->omod != OVOID) { /* if we have modifier, use it */
94	greg	1.1	r->ro = o;
95	greg	1.8	r->rox = NULL;
96	greg	1.4	} else { /* else use theirs */
97	greg	1.1	r->ro = rcont.ro;
98	greg	1.8	if (rcont.rox != NULL) {
99	greg	1.9	newrayxf(r); /* allocate transformation */
100			/* NOTE: r->rox may equal rcont.rox! */
101	greg	1.8	multmat4(r->rox->f.xfm, rcont.rox->f.xfm, in->x.f.xfm);
102			r->rox->f.sca = rcont.rox->f.sca * in->x.f.sca;
103			multmat4(r->rox->b.xfm, in->x.b.xfm, rcont.rox->b.xfm);
104			r->rox->b.sca = in->x.b.sca * rcont.rox->b.sca;
105			} else
106	greg	1.9	r->rox = &in->x;
107	greg	1.1	}
108			/* transform it back */
109	greg	1.8	r->rot = rcont.rot * in->x.f.sca;
110			multp3(r->rop, rcont.rop, in->x.f.xfm);
111			multv3(r->ron, rcont.ron, in->x.f.xfm);
112	greg	1.1	for (i = 0; i < 3; i++)
113	greg	1.8	r->ron[i] /= in->x.f.sca;
114	greg	1.1	r->rod = rcont.rod;
115			/* return hit */
116			return(1);
117			}