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/* Copyright (c) 1995 Regents of the University of California */ |
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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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* Mist volumetric material. |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "source.h" |
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* |
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* Up to five real arguments may be given for MAT_MIST: |
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* |
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* [ext_r ext_g ext_b [albedo [gecc]]] |
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* [ext_r ext_g ext_b [albedo_r albedo_g albedo_b [gecc]]] |
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* |
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* The primaries indicate medium extinction per unit length (absorption |
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* plus scattering). The albedo is the ratio of scattering to extinction, |
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* plus scattering), which is added to the global extinction coefficient, set |
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* by the -me option. The albedo is the ratio of scattering to extinction, |
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* and is set globally by the -ma option (salbedo) and overridden here. |
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* The Heyney-Greenstein eccentricity parameter (-mg seccg) indicates how much |
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* scattering favors the forward direction. A value of 0 means isotropic |
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* scattering. A value approaching 1 indicates strong forward scattering. |
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*/ |
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#ifndef MAXSLIST |
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#define MAXSLIST 32 /* maximum sources to check */ |
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#endif |
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#define RELAYDELIM '>' /* relay delimiter character */ |
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extern COLOR cextinction; /* global coefficient of extinction */ |
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extern double salbedo; /* global scattering albedo */ |
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extern double seccg; /* global scattering eccentricity */ |
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static int |
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inslist(sl, n) /* return index of source n if it's in list sl */ |
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register int *sl; |
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register SRCREC *sp; |
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register char *id; |
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{ |
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extern char *index(); |
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register char *cp; |
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/* check for relay sources */ |
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while ((cp = index(id, RELAYDELIM)) != NULL) { |
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} |
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static |
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static void |
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add2slist(r, sl) /* add source list to ray's */ |
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register RAY *r; |
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register int *sl; |
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for (i = sl[0]; i > 0; i--) |
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if (!inslist(r->slights, sl[i])) { |
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if (r->slights[0] >= MAXSLIST) |
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error(USER, "scattering source list overflow"); |
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error(INTERNAL, |
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"scattering source list overflow"); |
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r->slights[++r->slights[0]] = sl[i]; |
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} |
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} |
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int |
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m_mist(m, r) /* process a ray entering or leaving some mist */ |
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OBJREC *m; |
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register RAY *r; |
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double re, ge, be; |
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register int i, j; |
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/* check arguments */ |
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if (m->oargs.nfargs > 5) |
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if (m->oargs.nfargs > 7) |
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objerror(m, USER, "bad arguments"); |
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/* get source indices */ |
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if (m->oargs.nsargs > 0 && (myslist = (int *)m->os) == NULL) { |
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if (m->oargs.nsargs > MAXSLIST) |
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objerror(m, USER, "too many sources in list"); |
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objerror(m, INTERNAL, "too many sources in list"); |
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myslist = (int *)malloc((m->oargs.nsargs+1)*sizeof(int)); |
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if (myslist == NULL) |
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goto memerr; |
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p.slights[0] = 0; |
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if (r->rod > 0.) { /* entering ray */ |
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addcolor(p.cext, mext); |
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if (m->oargs.nfargs > 3) |
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p.albedo = m->oargs.farg[3]; |
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if (m->oargs.nfargs > 4) |
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p.gecc = m->oargs.farg[4]; |
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if (m->oargs.nfargs > 5) |
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setcolor(p.albedo, m->oargs.farg[3], |
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m->oargs.farg[4], m->oargs.farg[5]); |
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if (m->oargs.nfargs > 6) |
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p.gecc = m->oargs.farg[6]; |
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add2slist(&p, myslist); /* add to list */ |
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} else { /* leaving ray */ |
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if (myslist != NULL) { /* delete from list */ |
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p.slights[++i] = p.slights[j]; |
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if (p.slights[0] - i < myslist[0]) { /* fix old */ |
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addcolor(r->cext, mext); |
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if (m->oargs.nfargs > 3) |
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r->albedo = m->oargs.farg[3]; |
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if (m->oargs.nfargs > 4) |
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r->gecc = m->oargs.farg[4]; |
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if (m->oargs.nfargs > 5) |
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setcolor(r->albedo, m->oargs.farg[3], |
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m->oargs.farg[4], m->oargs.farg[5]); |
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if (m->oargs.nfargs > 6) |
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r->gecc = m->oargs.farg[6]; |
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add2slist(r, myslist); |
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} |
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p.slights[0] = i; |
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} |
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re = colval(r->cext,RED) - colval(mext,RED); |
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ge = colval(r->cext,GRN) - colval(mext,GRN); |
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be = colval(r->cext,BLU) - colval(mext,BLU); |
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setcolor(p.cext, re<0. ? 0. : re, |
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ge<0. ? 0. : ge, |
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be<0. ? 0. : be); |
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if (m->oargs.nfargs > 3) |
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p.albedo = salbedo; |
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if (m->oargs.nfargs > 4) |
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if ((re = colval(r->cext,RED) - colval(mext,RED)) < |
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colval(cextinction,RED)) |
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re = colval(cextinction,RED); |
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if ((ge = colval(r->cext,GRN) - colval(mext,GRN)) < |
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colval(cextinction,GRN)) |
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ge = colval(cextinction,GRN); |
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if ((be = colval(r->cext,BLU) - colval(mext,BLU)) < |
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colval(cextinction,BLU)) |
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be = colval(cextinction,BLU); |
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setcolor(p.cext, re, ge, be); |
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if (m->oargs.nfargs > 5) |
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copycolor(p.albedo, salbedo); |
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if (m->oargs.nfargs > 6) |
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p.gecc = seccg; |
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} |
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rayvalue(&p); /* calls rayparticipate() */ |
