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/* Copyright (c) 1995 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* source.c - routines dealing with illumination sources. |
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* |
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* 8/20/85 |
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* External symbols declared in source.h |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#include "ray.h" |
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "source.h" |
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#include "random.h" |
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|
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extern double ssampdist; /* scatter sampling distance */ |
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|
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#ifndef MAXSSAMP |
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#define MAXSSAMP 16 /* maximum samples per ray */ |
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#endif |
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|
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/* |
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* Structures used by direct() |
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*/ |
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static int maxcntr = 0; /* size of contribution arrays */ |
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|
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void |
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marksources() /* find and mark source objects */ |
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{ |
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int foundsource = 0; |
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} |
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|
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|
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void |
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freesources() /* free all source structures */ |
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{ |
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if (nsources > 0) { |
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free((void *)source); |
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source = NULL; |
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nsources = 0; |
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} |
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if (maxcntr <= 0) |
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return; |
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free((void *)srccnt); |
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srccnt = NULL; |
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free((void *)cntord); |
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cntord = NULL; |
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maxcntr = 0; |
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} |
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|
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|
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int |
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srcray(sr, r, si) /* send a ray to a source, return domega */ |
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register RAY *sr; /* returned source ray */ |
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RAY *r; /* ray which hit object */ |
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} |
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|
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|
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void |
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srcvalue(r) /* punch ray to source and compute value */ |
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register RAY *r; |
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{ |
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return; |
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if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
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rayparticipate(r); |
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return; |
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} |
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/* compute intersection */ |
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sp->sa.success++; |
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if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
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rayparticipate(r); |
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return; |
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} |
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/* we missed our mark! */ |
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} |
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|
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|
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int |
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sourcehit(r) /* check to see if ray hit distant source */ |
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register RAY *r; |
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{ |
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} |
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if (r->ro != NULL) { |
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r->robj = objndx(r->ro); |
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for (i = 0; i < 3; i++) |
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r->ron[i] = -r->rdir[i]; |
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r->rod = 1.0; |
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} |
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|
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void |
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direct(r, f, p) /* add direct component */ |
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RAY *r; /* ray that hit surface */ |
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int (*f)(); /* direct component coefficient function */ |
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void (*f)(); /* direct component coefficient function */ |
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char *p; /* data for f */ |
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{ |
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extern int (*trace)(); |
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extern void (*trace)(); |
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register int sn; |
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register CONTRIB *scp; |
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SRCINDEX si; |
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( sr.ro != source[scp->sno].so || |
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source[scp->sno].sflags & SFOLLOW )) { |
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/* follow entire path */ |
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if (!raycont(&sr)) |
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objerror(sr.ro, USER, "material not found"); |
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raycont(&sr); |
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rayparticipate(&sr); |
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if (trace != NULL) |
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(*trace)(&sr); /* trace execution */ |
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if (bright(sr.rcol) <= FTINY) |
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} |
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|
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|
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void |
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srcscatter(r) /* compute source scattering into ray */ |
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register RAY *r; |
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{ |
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int oldsampndx; |
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int nsamps; |
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RAY sr; |
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SRCINDEX si; |
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double t, d; |
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double re, ge, be; |
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COLOR cvext; |
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int i, j; |
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|
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if (r->slights == NULL || r->slights[0] == 0 |
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|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
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return; |
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if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
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nsamps = 1; |
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#if MAXSSAMP |
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else if (nsamps > MAXSSAMP) |
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nsamps = MAXSSAMP; |
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#endif |
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oldsampndx = samplendx; |
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samplendx = random()&0x7fff; /* randomize */ |
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for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
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for (j = 0; j < nsamps; j++) { /* for each sample position */ |
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samplendx++; |
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t = r->rot * (j+frandom())/nsamps; |
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/* extinction */ |
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re = t*colval(r->cext,RED); |
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ge = t*colval(r->cext,GRN); |
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be = t*colval(r->cext,BLU); |
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setcolor(cvext, re > 92. ? 0. : exp(-re), |
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ge > 92. ? 0. : exp(-ge), |
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be > 92. ? 0. : exp(-be)); |
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if (intens(cvext) <= FTINY) |
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break; /* too far away */ |
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sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
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sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
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sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
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sr.rmax = 0.; |
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initsrcindex(&si); /* sample ray to this source */ |
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si.sn = r->slights[i]; |
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nopart(&si, &sr); |
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if (!srcray(&sr, NULL, &si) || |
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sr.rsrc != r->slights[i]) |
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continue; /* no path */ |
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copycolor(sr.cext, r->cext); |
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copycolor(sr.albedo, r->albedo); |
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sr.gecc = r->gecc; |
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sr.slights = r->slights; |
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rayvalue(&sr); /* eval. source ray */ |
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if (bright(sr.rcol) <= FTINY) |
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continue; |
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if (r->gecc <= FTINY) /* compute P(theta) */ |
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d = 1.; |
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else { |
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d = DOT(r->rdir, sr.rdir); |
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d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
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d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
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} |
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/* other factors */ |
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d *= si.dom * r->rot / (4.*PI*nsamps); |
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multcolor(sr.rcol, r->cext); |
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multcolor(sr.rcol, r->albedo); |
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scalecolor(sr.rcol, d); |
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multcolor(sr.rcol, cvext); |
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addcolor(r->rcol, sr.rcol); /* add it in */ |
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} |
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} |
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samplendx = oldsampndx; |
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} |
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|
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|
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/**************************************************************** |
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* The following macros were separated from the m_light() routine |
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* because they are very nasty and difficult to understand. |
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distglow(m, r, raydist(r,PRIMARY))) |
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|
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|
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int |
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m_light(m, r) /* ray hit a light source */ |
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register OBJREC *m; |
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register RAY *r; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
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if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
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return(rayshade(r, modifier(m->oargs.sarg[0]))); |
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return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
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raytrans(r); |
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return(1); |
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} |