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/* Copyright (c) 1993 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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|
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#include "octree.h" |
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|
69 |
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#include "otypes.h" |
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|
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#include "source.h" |
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|
73 |
+ |
#include "random.h" |
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|
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extern double ssampdist; /* scatter sampling distance */ |
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|
77 |
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#ifndef MAXSSAMP |
78 |
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#define MAXSSAMP 16 /* maximum samples per ray */ |
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#endif |
80 |
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|
81 |
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/* |
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* Structures used by direct() |
83 |
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*/ |
99 |
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static int maxcntr = 0; /* size of contribution arrays */ |
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|
101 |
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|
102 |
+ |
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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o->otype != OBJ_SOURCE && |
130 |
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m->oargs.farg[3] <= FTINY) |
131 |
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continue; /* don't bother */ |
132 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
133 |
+ |
m->oargs.farg[2] <= FTINY) |
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continue; /* don't bother */ |
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|
136 |
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if (sfun[o->otype].of == NULL || |
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sfun[o->otype].of->setsrc == NULL) |
178 |
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} |
179 |
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|
180 |
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|
181 |
+ |
void |
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+ |
freesources() /* free all source structures */ |
183 |
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{ |
184 |
+ |
if (nsources > 0) { |
185 |
+ |
free((void *)source); |
186 |
+ |
source = NULL; |
187 |
+ |
nsources = 0; |
188 |
+ |
} |
189 |
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if (maxcntr <= 0) |
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return; |
191 |
+ |
free((void *)srccnt); |
192 |
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srccnt = NULL; |
193 |
+ |
free((void *)cntord); |
194 |
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cntord = NULL; |
195 |
+ |
maxcntr = 0; |
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+ |
} |
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|
198 |
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|
199 |
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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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sr->rsrc = si->sn; /* remember source */ |
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srcp = source + si->sn; |
213 |
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if (srcp->sflags & SDISTANT) { |
214 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
214 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
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continue; |
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return(1); /* sample OK */ |
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} |
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continue; |
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/* check angle */ |
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if (srcp->sflags & SSPOT) { |
224 |
< |
if (spotout(sr, srcp->sl.s, 0)) |
224 |
> |
if (spotout(sr, srcp->sl.s)) |
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continue; |
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/* adjust solid angle */ |
227 |
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si->dom *= d*d; |
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} |
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|
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|
237 |
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void |
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srcvalue(r) /* punch ray to source and compute value */ |
239 |
< |
RAY *r; |
239 |
> |
register RAY *r; |
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{ |
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register SRCREC *sp; |
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|
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/* check intersection */ |
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if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
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return; |
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< |
raycont(r); /* compute contribution */ |
248 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
249 |
> |
goto nomat; |
250 |
> |
rayparticipate(r); |
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return; |
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} |
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/* compute intersection */ |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
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if (sp->sa.success >= 0) |
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sp->sa.success++; |
258 |
< |
raycont(r); /* compute contribution */ |
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> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
260 |
> |
rayparticipate(r); |
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return; |
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} |
263 |
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/* we missed our mark! */ |
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if (sp->sa.success < 0) |
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return; /* bitched already */ |
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sp->sa.success -= AIMREQT; |
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sprintf(errmsg, "aiming failure for light source \"%s\"", |
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sp->so->oname); |
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error(WARNING, errmsg); /* issue warning */ |
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return; |
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nomat: |
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objerror(r->ro, USER, "material not found"); |
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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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|
303 |
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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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|
327 |
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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 */ |
330 |
< |
int (*f)(); /* direct component coefficient function */ |
330 |
> |
void (*f)(); /* direct component coefficient function */ |
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char *p; /* data for f */ |
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{ |
333 |
< |
extern int (*trace)(); |
333 |
> |
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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source[scp->sno].sflags & SFOLLOW )) { |
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/* follow entire path */ |
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raycont(&sr); |
417 |
+ |
rayparticipate(&sr); |
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if (trace != NULL) |
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(*trace)(&sr); /* trace execution */ |
420 |
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if (bright(sr.rcol) <= FTINY) |
450 |
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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; |
458 |
+ |
int nsamps; |
459 |
+ |
RAY sr; |
460 |
+ |
SRCINDEX si; |
461 |
+ |
double t, d; |
462 |
+ |
double re, ge, be; |
463 |
+ |
COLOR cvext; |
464 |
+ |
int i, j; |
465 |
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|
466 |
+ |
if (r->slights == NULL || r->slights[0] == 0 |
467 |
+ |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
468 |
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return; |
469 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
470 |
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nsamps = 1; |
471 |
+ |
#if MAXSSAMP |
472 |
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else if (nsamps > MAXSSAMP) |
473 |
+ |
nsamps = MAXSSAMP; |
474 |
+ |
#endif |
475 |
+ |
oldsampndx = samplendx; |
476 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
477 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
478 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
479 |
+ |
samplendx++; |
480 |
+ |
t = r->rot * (j+frandom())/nsamps; |
481 |
+ |
/* extinction */ |
482 |
+ |
re = t*colval(r->cext,RED); |
483 |
+ |
ge = t*colval(r->cext,GRN); |
484 |
+ |
be = t*colval(r->cext,BLU); |
485 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
486 |
+ |
ge > 92. ? 0. : exp(-ge), |
487 |
+ |
be > 92. ? 0. : exp(-be)); |
488 |
+ |
if (intens(cvext) <= FTINY) |
489 |
+ |
break; /* too far away */ |
490 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
491 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
492 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
493 |
+ |
sr.rmax = 0.; |
494 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
495 |
+ |
si.sn = r->slights[i]; |
496 |
+ |
nopart(&si, &sr); |
497 |
+ |
if (!srcray(&sr, NULL, &si) || |
498 |
+ |
sr.rsrc != r->slights[i]) |
499 |
+ |
continue; /* no path */ |
500 |
+ |
copycolor(sr.cext, r->cext); |
501 |
+ |
copycolor(sr.albedo, r->albedo); |
502 |
+ |
sr.gecc = r->gecc; |
503 |
+ |
sr.slights = r->slights; |
504 |
+ |
rayvalue(&sr); /* eval. source ray */ |
505 |
+ |
if (bright(sr.rcol) <= FTINY) |
506 |
+ |
continue; |
507 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
508 |
+ |
d = 1.; |
509 |
+ |
else { |
510 |
+ |
d = DOT(r->rdir, sr.rdir); |
511 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
512 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
513 |
+ |
} |
514 |
+ |
/* other factors */ |
515 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
516 |
+ |
multcolor(sr.rcol, r->cext); |
517 |
+ |
multcolor(sr.rcol, r->albedo); |
518 |
+ |
scalecolor(sr.rcol, d); |
519 |
+ |
multcolor(sr.rcol, cvext); |
520 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
521 |
+ |
} |
522 |
+ |
} |
523 |
+ |
samplendx = oldsampndx; |
524 |
+ |
} |
525 |
+ |
|
526 |
+ |
|
527 |
|
/**************************************************************** |
528 |
|
* The following macros were separated from the m_light() routine |
529 |
|
* because they are very nasty and difficult to understand. |
565 |
|
* (Glows with negative radii should NEVER participate in illumination.) |
566 |
|
*/ |
567 |
|
|
568 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
568 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
569 |
|
m->oargs.farg[3] >= -FTINY && \ |
570 |
< |
r->rot > m->oargs.farg[3]) |
570 |
> |
d > m->oargs.farg[3]) |
571 |
|
|
572 |
|
/* badcomponent * |
573 |
|
* |
580 |
|
|
581 |
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
582 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
583 |
< |
distglow(m, r))) |
583 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
584 |
|
|
585 |
|
/* passillum * |
586 |
|
* |
598 |
|
* The -dv flag is normally on for sources to be visible. |
599 |
|
*/ |
600 |
|
|
601 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
602 |
< |
!distglow(m, r)) |
601 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
602 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
603 |
|
|
604 |
|
|
605 |
+ |
int |
606 |
|
m_light(m, r) /* ray hit a light source */ |
607 |
|
register OBJREC *m; |
608 |
|
register RAY *r; |
610 |
|
/* check for over-counting */ |
611 |
|
if (badcomponent(m, r)) |
612 |
|
return(1); |
613 |
< |
if (wrongsource(m,r)) |
613 |
> |
if (wrongsource(m, r)) |
614 |
|
return(1); |
615 |
|
/* check for passed illum */ |
616 |
|
if (passillum(m, r)) { |
617 |
|
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
618 |
< |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
618 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
619 |
|
raytrans(r); |
620 |
|
return(1); |
621 |
|
} |
627 |
|
if (srcignore(m, r)) |
628 |
|
return(1); |
629 |
|
/* check for outside spot */ |
630 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
630 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
631 |
|
return(1); |
632 |
|
/* get distribution pattern */ |
633 |
|
raytexture(r, m->omod); |