src/rt/m_clip.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  m_clip.c - routine for clipped (cut) objects.
 */

/* ====================================================================
 * 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"

/*
 *  Clipping objects permit holes and sections to be taken out
 *  of other objects.  The method is simple:  
 *
 *  The argument is the clipped materials;
 *  the first is used to shade upon exit.
 */


int
m_clip(m, r)                    /* clip objects from ray */
register OBJREC  *m;
register RAY  *r;
{
        OBJECT  cset[MAXSET+1], *modset;
        OBJECT  obj, mod;
        int  entering;
        register int  i;

        obj = objndx(m);
        if ((modset = (OBJECT *)m->os) == NULL) {
                if (m->oargs.nsargs < 1 || m->oargs.nsargs > MAXSET)
                        objerror(m, USER, "bad # arguments");
                modset = (OBJECT *)malloc((m->oargs.nsargs+1)*sizeof(OBJECT));
                if (modset == NULL)
                        error(SYSTEM, "out of memory in m_clip");
                modset[0] = 0;
                for (i = 0; i < m->oargs.nsargs; i++) {
                        if (!strcmp(m->oargs.sarg[i], VOIDID))
                                continue;
                        if ((mod = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
                                sprintf(errmsg, "unknown modifier \"%s\"",
                                                m->oargs.sarg[i]);
                                objerror(m, WARNING, errmsg);
                                continue;
                        }
                        if (inset(modset, mod)) {
                                objerror(m, WARNING, "duplicate modifier");
                                continue;
                        }
                        insertelem(modset, mod);
                }
                m->os = (char *)modset;
        }
        if (r->clipset != NULL)
                setcopy(cset, r->clipset);
        else
                cset[0] = 0;

        entering = r->rod > 0.0;                /* entering clipped region? */

        for (i = modset[0]; i > 0; i--) {
                if (entering) {
                        if (!inset(cset, modset[i])) {
                                if (cset[0] >= MAXSET)
                                        error(INTERNAL, "set overflow in m_clip");
                                insertelem(cset, modset[i]);
                        }
                } else {
                        if (inset(cset, modset[i]))
                                deletelem(cset, modset[i]);
                }
        }
                                        /* compute ray value */
        r->newcset = cset;
        if (strcmp(m->oargs.sarg[0], VOIDID)) {
                int  inside = 0;
                register RAY  *rp;
                                        /* check for penetration */
                for (rp = r; rp->parent != NULL; rp = rp->parent)
                        if (!(rp->rtype & RAYREFL) && rp->parent->ro != NULL
                                        && inset(modset, rp->parent->ro->omod))
                                if (rp->parent->rod > 0.0)
                                        inside++;
                                else
                                        inside--;
                if (inside > 0) {       /* we just hit the object */
                        flipsurface(r);
                        return(rayshade(r, lastmod(obj, m->oargs.sarg[0])));
                }
        }
        raytrans(r);                    /* else transfer ray */
        return(1);
}
Revision:	2.5
Committed:	Sat Feb 22 02:07:28 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+58 -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	* m_clip.c - routine for clipped (cut) objects.
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	/*
68	* Clipping objects permit holes and sections to be taken out
69	* of other objects. The method is simple:
70	*
71	* The argument is the clipped materials;
72	* the first is used to shade upon exit.
73	*/
74
75
76	int
77	m_clip(m, r) /* clip objects from ray */
78	register OBJREC *m;
79	register RAY *r;
80	{
81	OBJECT cset[MAXSET+1], *modset;
82	OBJECT obj, mod;
83	int entering;
84	register int i;
85
86	obj = objndx(m);
87	if ((modset = (OBJECT *)m->os) == NULL) {
88	if (m->oargs.nsargs < 1 \|\| m->oargs.nsargs > MAXSET)
89	objerror(m, USER, "bad # arguments");
90	modset = (OBJECT )malloc((m->oargs.nsargs+1)sizeof(OBJECT));
91	if (modset == NULL)
92	error(SYSTEM, "out of memory in m_clip");
93	modset[0] = 0;
94	for (i = 0; i < m->oargs.nsargs; i++) {
95	if (!strcmp(m->oargs.sarg[i], VOIDID))
96	continue;
97	if ((mod = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
98	sprintf(errmsg, "unknown modifier \"%s\"",
99	m->oargs.sarg[i]);
100	objerror(m, WARNING, errmsg);
101	continue;
102	}
103	if (inset(modset, mod)) {
104	objerror(m, WARNING, "duplicate modifier");
105	continue;
106	}
107	insertelem(modset, mod);
108	}
109	m->os = (char *)modset;
110	}
111	if (r->clipset != NULL)
112	setcopy(cset, r->clipset);
113	else
114	cset[0] = 0;
115
116	entering = r->rod > 0.0; /* entering clipped region? */
117
118	for (i = modset[0]; i > 0; i--) {
119	if (entering) {
120	if (!inset(cset, modset[i])) {
121	if (cset[0] >= MAXSET)
122	error(INTERNAL, "set overflow in m_clip");
123	insertelem(cset, modset[i]);
124	}
125	} else {
126	if (inset(cset, modset[i]))
127	deletelem(cset, modset[i]);
128	}
129	}
130	/* compute ray value */
131	r->newcset = cset;
132	if (strcmp(m->oargs.sarg[0], VOIDID)) {
133	int inside = 0;
134	register RAY *rp;
135	/* check for penetration */
136	for (rp = r; rp->parent != NULL; rp = rp->parent)
137	if (!(rp->rtype & RAYREFL) && rp->parent->ro != NULL
138	&& inset(modset, rp->parent->ro->omod))
139	if (rp->parent->rod > 0.0)
140	inside++;
141	else
142	inside--;
143	if (inside > 0) { /* we just hit the object */
144	flipsurface(r);
145	return(rayshade(r, lastmod(obj, m->oargs.sarg[0])));
146	}
147	}
148	raytrans(r); /* else transfer ray */
149	return(1);
150	}