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/* Copyright (c) 1991 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 sampling routines |
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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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#include "source.h" |
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#include "random.h" |
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static int cyl_partit(), flt_partit(); |
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|
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|
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double |
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nextssamp(r, si) /* compute sample for source, rtn. distance */ |
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register RAY *r; /* origin is read, direction is set */ |
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FVECT vpos; |
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double d; |
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register int i; |
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nextsample: |
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while (++si->sp >= si->np) { /* get next sample */ |
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if (++si->sn >= nsources) |
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return(0.0); /* no more */ |
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r->rdir[i] -= r->rorg[i]; |
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/* compute distance */ |
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if ((d = normalize(r->rdir)) == 0.0) |
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return(nextssamp(r, si)); /* at source! */ |
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goto nextsample; /* at source! */ |
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/* compute sample size */ |
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si->dom = source[si->sn].ss2; |
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if (source[si->sn].sflags & SFLAT) { |
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si->dom *= sflatform(si->sn, r->rdir); |
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si->dom *= (double)(size[SU]*size[SV])/(MAXSPART*MAXSPART); |
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si->dom = sflatform(si->sn, r->rdir); |
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si->dom *= size[SU]*size[SV]/(MAXSPART*(double)MAXSPART); |
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} else if (source[si->sn].sflags & SCYL) { |
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si->dom *= scylform(si->sn, r->rdir); |
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si->dom *= (double)size[SU]/MAXSPART; |
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si->dom = scylform(si->sn, r->rdir); |
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si->dom *= size[SU]/(double)MAXSPART; |
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} else { |
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si->dom *= (double)(size[SU]*size[SV]*size[SW]) / |
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(MAXSPART*MAXSPART*MAXSPART) ; |
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si->dom = size[SU]*size[SV]*(double)size[SW] / |
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(MAXSPART*MAXSPART*(double)MAXSPART) ; |
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} |
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if (source[si->sn].sflags & SDISTANT) |
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if (source[si->sn].sflags & SDISTANT) { |
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si->dom *= source[si->sn].ss2; |
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return(FHUGE); |
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si->dom /= d*d; |
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} |
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if (si->dom <= 1e-4) |
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goto nextsample; /* behind source? */ |
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si->dom *= source[si->sn].ss2/(d*d); |
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return(d); /* sample OK, return distance */ |
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} |
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int |
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skipparts(ct, sz, pp, pt) /* skip to requested partition */ |
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int ct[3], sz[3]; /* center and size of partition (returned) */ |
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register int pp[2]; /* current index, number to skip (modified) */ |
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} |
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void |
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nopart(si, r) /* single source partition */ |
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register SRCINDEX *si; |
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RAY *r; |
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} |
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void |
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cylpart(si, r) /* partition a cylinder */ |
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SRCINDEX *si; |
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register RAY *r; |
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} |
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void |
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flatpart(si, r) /* partition a flat source */ |
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register SRCINDEX *si; |
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register RAY *r; |