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#ifndef lint |
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static const char RCSid[] = "$Id"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Mist volumetric material. |
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#include "copyright.h" |
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#include "ray.h" |
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#include <string.h> |
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#include "ray.h" |
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#include "source.h" |
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#include "rtotypes.h" |
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/* |
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* A mist volume is used to specify a region in the scene where a certain |
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#define RELAYDELIM '>' /* relay delimiter character */ |
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static int inslist(int *sl, int n); |
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static int srcmatch(SRCREC *sp, char *id); |
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static void add2slist(RAY *r, int *sl); |
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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 int n; |
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inslist( /* return index of source n if it's in list sl */ |
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int *sl, |
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int n |
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) |
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{ |
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register int i; |
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int i; |
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for (i = sl[0]; i > 0; i--) |
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if (sl[i] == n) |
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static int |
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srcmatch(sp, id) /* check for an id match on a light source */ |
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register SRCREC *sp; |
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register char *id; |
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srcmatch( /* check for an id match on a light source */ |
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SRCREC *sp, |
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char *id |
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) |
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{ |
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register char *cp; |
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char *cp; |
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/* check for relay sources */ |
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while ((cp = index(id, RELAYDELIM)) != NULL) { |
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while ((cp = strchr(id, RELAYDELIM)) != NULL) { |
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if (!(sp->sflags & SVIRTUAL) || sp->so == NULL) |
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return(0); |
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if (strncmp(id, sp->so->oname, cp-id) || sp->so->oname[cp-id]) |
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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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add2slist( /* add source list to ray's */ |
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RAY *r, |
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int *sl |
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) |
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{ |
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static int slspare[MAXSLIST+1]; /* in case of emergence */ |
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register int i; |
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int i; |
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if (sl == NULL || sl[0] == 0) /* nothing to add */ |
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return; |
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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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m_mist( /* process a ray entering or leaving some mist */ |
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OBJREC *m, |
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RAY *r |
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) |
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{ |
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RAY p; |
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int *myslist = NULL; |
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int newslist[MAXSLIST+1]; |
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COLOR mext; |
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double re, ge, be; |
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register int i, j; |
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int i, j; |
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/* check arguments */ |
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if (m->oargs.nfargs > 7) |
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objerror(m, USER, "bad arguments"); |
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} else |
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setcolor(mext, 0., 0., 0.); |
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/* start transmitted ray */ |
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if (rayorigin(&p, r, TRANS, 1.) < 0) |
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if (rayorigin(&p, TRANS, r, NULL) < 0) |
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return(1); |
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VCOPY(p.rdir, r->rdir); |
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p.slights = newslist; |
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} else { /* leaving ray */ |
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if (myslist != NULL) { /* delete from list */ |
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for (j = myslist[0]; j > 0; j--) |
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if (i = inslist(p.slights, myslist[j])) |
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if ( (i = inslist(p.slights, myslist[j])) ) |
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p.slights[i] = -1; |
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for (i = 0, j = 1; j <= p.slights[0]; j++) |
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if (p.slights[j] != -1) |
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return(1); |
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memerr: |
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error(SYSTEM, "out of memory in m_mist"); |
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return 0; /* pro forma return */ |
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} |
