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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for simulating virtual light sources |
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* Thus far, we only support planar mirrors. |
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* |
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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 "otypes.h" |
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|
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#include "source.h" |
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|
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#include "random.h" |
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|
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#define MINSAMPLES 16 /* minimum number of pretest samples */ |
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#define STESTMAX 32 /* maximum seeks per sample */ |
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|
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|
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static OBJECT *vobject; /* virtual source objects */ |
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static int nvobjects = 0; /* number of virtual source objects */ |
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|
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|
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void |
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markvirtuals() /* find and mark virtual sources */ |
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{ |
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register OBJREC *o; |
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register int i; |
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/* check number of direct relays */ |
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if (directrelay <= 0) |
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return; |
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/* find virtual source objects */ |
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for (i = 0; i < nobjects; i++) { |
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o = objptr(i); |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
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if (!isvlight(vsmaterial(o)->otype)) |
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continue; |
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if (sfun[o->otype].of == NULL || |
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sfun[o->otype].of->getpleq == NULL) { |
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objerror(o,WARNING,"secondary sources not supported"); |
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continue; |
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} |
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if (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
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vobject = (OBJECT *)realloc((char *)vobject, |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
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vobject[nvobjects++] = i; |
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} |
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if (nvobjects == 0) |
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return; |
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#ifdef DEBUG |
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fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
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#endif |
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/* append virtual sources */ |
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for (i = nsources; i-- > 0; ) |
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addvirtuals(i, directrelay); |
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/* done with our object list */ |
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free((void *)vobject); |
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nvobjects = 0; |
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} |
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|
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|
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void |
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addvirtuals(sn, nr) /* add virtuals associated with source */ |
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int sn; |
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int nr; |
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{ |
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register int i; |
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/* check relay limit first */ |
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if (nr <= 0) |
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return; |
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if (source[sn].sflags & SSKIP) |
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return; |
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/* check each virtual object for projection */ |
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for (i = 0; i < nvobjects; i++) |
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/* vproject() calls us recursively */ |
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vproject(objptr(vobject[i]), sn, nr-1); |
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} |
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|
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|
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void |
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vproject(o, sn, n) /* create projected source(s) if they exist */ |
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OBJREC *o; |
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int sn; |
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int n; |
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{ |
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register int i; |
152 |
register VSMATERIAL *vsmat; |
153 |
MAT4 proj; |
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int ns; |
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|
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if (o == source[sn].so) /* objects cannot project themselves */ |
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return; |
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/* get virtual source material */ |
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vsmat = sfun[vsmaterial(o)->otype].mf; |
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/* project virtual sources */ |
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for (i = 0; i < vsmat->nproj; i++) |
162 |
if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
163 |
if ((ns = makevsrc(o, sn, proj)) >= 0) { |
164 |
source[ns].sa.sv.pn = i; |
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#ifdef DEBUG |
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virtverb(ns, stderr); |
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#endif |
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addvirtuals(ns, n); |
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} |
170 |
} |
171 |
|
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|
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OBJREC * |
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vsmaterial(o) /* get virtual source material pointer */ |
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OBJREC *o; |
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{ |
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register int i; |
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register OBJREC *m; |
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|
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i = o->omod; |
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m = objptr(i); |
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if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
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!strcmp(m->oargs.sarg[0], VOIDID) || |
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(i = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
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return(m); /* direct modifier */ |
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return(objptr(i)); /* illum alternate */ |
187 |
} |
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|
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|
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int |
191 |
makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
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OBJREC *op; |
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register int sn; |
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MAT4 pm; |
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{ |
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FVECT nsloc, nsnorm, ocent, v; |
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double maxrad2, d; |
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int nsflags; |
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SPOT theirspot, ourspot; |
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register int i; |
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|
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nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
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/* get object center and max. radius */ |
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maxrad2 = getdisk(ocent, op, sn); |
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if (maxrad2 <= FTINY) /* too small? */ |
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return(-1); |
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/* get location and spot */ |
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if (source[sn].sflags & SDISTANT) { /* distant source */ |
209 |
if (source[sn].sflags & SPROX) |
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return(-1); /* should never get here! */ |
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multv3(nsloc, source[sn].sloc, pm); |
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normalize(nsloc); |
213 |
VCOPY(ourspot.aim, ocent); |
214 |
ourspot.siz = PI*maxrad2; |
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ourspot.flen = -1.; |
216 |
if (source[sn].sflags & SSPOT) { |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
218 |
/* adjust for source size */ |
219 |
d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
220 |
d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
221 |
theirspot.siz = PI*d*d; |
222 |
ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
223 |
d = ourspot.siz; |
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if (!commonbeam(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
226 |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = beamdisk(v, op, &ourspot, nsloc); |
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if (d <= FTINY) |
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return(-1); |
230 |
if (d < maxrad2) { |
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maxrad2 = d; |
232 |
VCOPY(ocent, v); |
233 |
} |
234 |
} |
235 |
} |
236 |
} else { /* local source */ |
237 |
multp3(nsloc, source[sn].sloc, pm); |
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for (i = 0; i < 3; i++) |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
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if ((d = normalize(ourspot.aim)) == 0.) |
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return(-1); /* at source!! */ |
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if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
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return(-1); /* too far away */ |
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ourspot.flen = 0.; |
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/* adjust for source size */ |
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d = (sqrt(maxrad2) + source[sn].srad) / d; |
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if (d < 1.-FTINY) |
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ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
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else |
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nsflags &= ~SSPOT; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
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normalize(theirspot.aim); |
255 |
if (nsflags & SSPOT) { |
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ourspot.flen = theirspot.flen; |
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d = ourspot.siz; |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
260 |
} else { |
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nsflags |= SSPOT; |
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copystruct(&ourspot, &theirspot); |
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d = 2.*ourspot.siz; |
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} |
265 |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = spotdisk(v, op, &ourspot, nsloc); |
267 |
if (d <= FTINY) |
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return(-1); |
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if (d < maxrad2) { |
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maxrad2 = d; |
271 |
VCOPY(ocent, v); |
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} |
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} |
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} |
275 |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
276 |
multv3(nsnorm, source[sn].snorm, pm); |
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normalize(nsnorm); |
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if (nsflags & SSPOT && !checkspot(&ourspot, nsnorm)) |
279 |
return(-1); |
280 |
} |
281 |
} |
282 |
/* pretest visibility */ |
283 |
nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
284 |
if (nsflags & SSKIP) |
285 |
return(-1); /* obstructed */ |
286 |
/* it all checks out, so make it */ |
287 |
if ((i = newsource()) < 0) |
288 |
goto memerr; |
289 |
source[i].sflags = nsflags; |
290 |
VCOPY(source[i].sloc, nsloc); |
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multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
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multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
293 |
if (nsflags & SFLAT) |
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VCOPY(source[i].snorm, nsnorm); |
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else |
296 |
multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
297 |
source[i].srad = source[sn].srad; |
298 |
source[i].ss2 = source[sn].ss2; |
299 |
if (nsflags & SSPOT) { |
300 |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
301 |
goto memerr; |
302 |
copystruct(source[i].sl.s, &ourspot); |
303 |
} |
304 |
if (nsflags & SPROX) |
305 |
source[i].sl.prox = source[sn].sl.prox; |
306 |
source[i].sa.sv.sn = sn; |
307 |
source[i].so = op; |
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return(i); |
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memerr: |
310 |
error(SYSTEM, "out of memory in makevsrc"); |
311 |
} |
312 |
|
313 |
|
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double |
315 |
getdisk(oc, op, sn) /* get visible object disk */ |
316 |
FVECT oc; |
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OBJREC *op; |
318 |
register int sn; |
319 |
{ |
320 |
double rad2, roffs, offs, d, rd, rdoto; |
321 |
FVECT rnrm, nrm; |
322 |
/* first, use object getdisk function */ |
323 |
rad2 = getmaxdisk(oc, op); |
324 |
if (!(source[sn].sflags & SVIRTUAL)) |
325 |
return(rad2); /* all done for normal source */ |
326 |
/* check for correct side of relay surface */ |
327 |
roffs = getplaneq(rnrm, source[sn].so); |
328 |
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
329 |
if (!(source[sn].sflags & SDISTANT)) |
330 |
rd -= roffs; |
331 |
d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
332 |
if ((d > 0.) ^ (rd > 0.)) |
333 |
return(rad2); /* OK if opposite sides */ |
334 |
if (d*d >= rad2) |
335 |
return(0.); /* no relay is possible */ |
336 |
/* we need a closer look */ |
337 |
offs = getplaneq(nrm, op); |
338 |
rdoto = DOT(rnrm, nrm); |
339 |
if (d*d >= rad2*(1.-rdoto*rdoto)) |
340 |
return(0.); /* disk entirely on projection side */ |
341 |
/* should shrink disk but I'm lazy */ |
342 |
return(rad2); |
343 |
} |
344 |
|
345 |
|
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int |
347 |
vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
348 |
int f; /* virtual source flags */ |
349 |
OBJREC *o; /* relay object */ |
350 |
FVECT oc; /* relay object center */ |
351 |
double or2; /* relay object radius squared */ |
352 |
register int sn; /* target source number */ |
353 |
{ |
354 |
RAY sr; |
355 |
FVECT onorm; |
356 |
FVECT offsdir; |
357 |
SRCINDEX si; |
358 |
double or, d; |
359 |
int stestlim, ssn; |
360 |
int nhit, nok; |
361 |
register int i, n; |
362 |
/* return if pretesting disabled */ |
363 |
if (vspretest <= 0) |
364 |
return(f); |
365 |
/* get surface normal */ |
366 |
getplaneq(onorm, o); |
367 |
/* set number of rays to sample */ |
368 |
if (source[sn].sflags & SDISTANT) { |
369 |
/* 32. == heuristic constant */ |
370 |
n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
371 |
} else { |
372 |
for (i = 0; i < 3; i++) |
373 |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
374 |
d = DOT(offsdir,offsdir); |
375 |
if (d <= FTINY) |
376 |
n = 2.*PI * vspretest + .5; |
377 |
else |
378 |
n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
379 |
} |
380 |
if (n < MINSAMPLES) n = MINSAMPLES; |
381 |
#ifdef DEBUG |
382 |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
383 |
sn, o->oname, n); |
384 |
#endif |
385 |
/* sample */ |
386 |
or = sqrt(or2); |
387 |
stestlim = n*STESTMAX; |
388 |
ssn = 0; |
389 |
nhit = nok = 0; |
390 |
initsrcindex(&si); |
391 |
while (n-- > 0) { |
392 |
/* get sample point */ |
393 |
do { |
394 |
if (ssn >= stestlim) { |
395 |
#ifdef DEBUG |
396 |
fprintf(stderr, "\ttoo hard to hit\n"); |
397 |
#endif |
398 |
return(f); /* too small a target! */ |
399 |
} |
400 |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
401 |
for (i = 0; i < 3; i++) |
402 |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
403 |
ssn++; |
404 |
d = 1. - DOT(offsdir, onorm); |
405 |
for (i = 0; i < 3; i++) { |
406 |
sr.rorg[i] = oc[i] + offsdir[i] + d*onorm[i]; |
407 |
sr.rdir[i] = -onorm[i]; |
408 |
} |
409 |
sr.rmax = 0.0; |
410 |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
411 |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
412 |
/* check against source */ |
413 |
VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
414 |
samplendx++; |
415 |
if (si.sp >= si.np-1 || |
416 |
!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
417 |
si.sn = sn-1; /* reset index to our source */ |
418 |
si.np = 0; |
419 |
if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
420 |
continue; /* can't get there from here */ |
421 |
} |
422 |
sr.revf = srcvalue; |
423 |
rayvalue(&sr); /* check sample validity */ |
424 |
if (bright(sr.rcol) <= FTINY) |
425 |
continue; |
426 |
nok++; /* got sample; check obstructions */ |
427 |
rayclear(&sr); |
428 |
sr.revf = raytrace; |
429 |
rayvalue(&sr); |
430 |
if (bright(sr.rcol) > FTINY) |
431 |
nhit++; |
432 |
if (nhit > 0 && nhit < nok) { |
433 |
#ifdef DEBUG |
434 |
fprintf(stderr, "\tpartially occluded\n"); |
435 |
#endif |
436 |
return(f); /* need to shadow test */ |
437 |
} |
438 |
} |
439 |
if (nhit == 0) { |
440 |
#ifdef DEBUG |
441 |
fprintf(stderr, "\t0%% hit rate\n"); |
442 |
#endif |
443 |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
444 |
} |
445 |
#ifdef DEBUG |
446 |
fprintf(stderr, "\t100%% hit rate\n"); |
447 |
#endif |
448 |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
449 |
} |
450 |
|
451 |
|
452 |
#ifdef DEBUG |
453 |
void |
454 |
virtverb(sn, fp) /* print verbose description of virtual source */ |
455 |
register int sn; |
456 |
FILE *fp; |
457 |
{ |
458 |
register int i; |
459 |
|
460 |
fprintf(fp, "%s virtual source %d in %s %s\n", |
461 |
source[sn].sflags & SDISTANT ? "distant" : "local", |
462 |
sn, ofun[source[sn].so->otype].funame, |
463 |
source[sn].so->oname); |
464 |
fprintf(fp, "\tat (%f,%f,%f)\n", |
465 |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
466 |
fprintf(fp, "\tlinked to source %d (%s)\n", |
467 |
source[sn].sa.sv.sn, source[source[sn].sa.sv.sn].so->oname); |
468 |
if (source[sn].sflags & SFOLLOW) |
469 |
fprintf(fp, "\talways followed\n"); |
470 |
else |
471 |
fprintf(fp, "\tnever followed\n"); |
472 |
if (!(source[sn].sflags & SSPOT)) |
473 |
return; |
474 |
fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
475 |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
476 |
source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
477 |
} |
478 |
#endif |