| 1 |
greg |
1.25 |
/* Copyright (c) 1990 Regents of the University of California */ |
| 2 |
greg |
1.1 |
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| 3 |
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#ifndef lint |
| 4 |
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static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
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#endif |
| 6 |
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| 7 |
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/* |
| 8 |
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* source.c - routines dealing with illumination sources. |
| 9 |
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* |
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* 8/20/85 |
| 11 |
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*/ |
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| 13 |
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#include "ray.h" |
| 14 |
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| 15 |
greg |
1.4 |
#include "octree.h" |
| 16 |
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| 17 |
greg |
1.1 |
#include "source.h" |
| 18 |
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| 19 |
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#include "otypes.h" |
| 20 |
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| 21 |
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#include "cone.h" |
| 22 |
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| 23 |
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#include "face.h" |
| 24 |
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| 25 |
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#include "random.h" |
| 26 |
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| 27 |
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| 28 |
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extern double dstrsrc; /* source distribution amount */ |
| 29 |
greg |
1.4 |
extern double shadthresh; /* relative shadow threshold */ |
| 30 |
greg |
1.12 |
extern double shadcert; /* shadow testing certainty */ |
| 31 |
greg |
1.1 |
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| 32 |
greg |
1.4 |
SRCREC *source = NULL; /* our list of sources */ |
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greg |
1.1 |
int nsources = 0; /* the number of sources */ |
| 34 |
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| 35 |
greg |
1.25 |
static CONTRIB *srccnt; /* source contributions in direct() */ |
| 36 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
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greg |
1.1 |
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| 38 |
greg |
1.25 |
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greg |
1.1 |
marksources() /* find and mark source objects */ |
| 40 |
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{ |
| 41 |
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register OBJREC *o, *m; |
| 42 |
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register int i; |
| 43 |
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| 44 |
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for (i = 0; i < nobjects; i++) { |
| 45 |
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| 46 |
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o = objptr(i); |
| 47 |
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| 48 |
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if (o->omod == OVOID) |
| 49 |
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continue; |
| 50 |
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| 51 |
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m = objptr(o->omod); |
| 52 |
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| 53 |
greg |
1.24 |
if (!islight(m->otype)) |
| 54 |
greg |
1.1 |
continue; |
| 55 |
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| 56 |
greg |
1.6 |
if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
| 57 |
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m->otype == MAT_SPOT ? 7 : 3)) |
| 58 |
greg |
1.1 |
objerror(m, USER, "bad # arguments"); |
| 59 |
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| 60 |
greg |
1.6 |
if (m->otype == MAT_GLOW && |
| 61 |
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o->otype != OBJ_SOURCE && |
| 62 |
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m->oargs.farg[3] <= FTINY) |
| 63 |
greg |
1.1 |
continue; /* don't bother */ |
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| 65 |
greg |
1.4 |
if (source == NULL) |
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source = (SRCREC *)malloc(sizeof(SRCREC)); |
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else |
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source = (SRCREC *)realloc((char *)source, |
| 69 |
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(unsigned)(nsources+1)*sizeof(SRCREC)); |
| 70 |
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if (source == NULL) |
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greg |
1.25 |
goto memerr; |
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greg |
1.1 |
|
| 73 |
greg |
1.4 |
newsource(&source[nsources], o); |
| 74 |
greg |
1.1 |
|
| 75 |
greg |
1.6 |
if (m->otype == MAT_GLOW) { |
| 76 |
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source[nsources].sflags |= SPROX; |
| 77 |
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source[nsources].sl.prox = m->oargs.farg[3]; |
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if (o->otype == OBJ_SOURCE) |
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source[nsources].sflags |= SSKIP; |
| 80 |
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} else if (m->otype == MAT_SPOT) { |
| 81 |
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source[nsources].sflags |= SSPOT; |
| 82 |
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source[nsources].sl.s = makespot(m); |
| 83 |
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} |
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greg |
1.1 |
nsources++; |
| 85 |
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} |
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greg |
1.25 |
if (nsources <= 0) { |
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error(WARNING, "no light sources found"); |
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return; |
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} |
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srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
| 91 |
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cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
| 92 |
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if (srccnt != NULL && cntord != NULL) |
| 93 |
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return; |
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/* fall through */ |
| 95 |
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memerr: |
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error(SYSTEM, "out of memory in marksources"); |
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greg |
1.1 |
} |
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| 100 |
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newsource(src, so) /* add a source to the array */ |
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greg |
1.4 |
register SRCREC *src; |
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greg |
1.1 |
register OBJREC *so; |
| 103 |
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{ |
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double cos(), tan(), sqrt(); |
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double theta; |
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FACE *f; |
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CONE *co; |
| 108 |
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int j; |
| 109 |
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register int i; |
| 110 |
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| 111 |
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src->sflags = 0; |
| 112 |
greg |
1.30 |
src->aimsuccess = 2*AIMREQT-1; /* bitch on second failure */ |
| 113 |
greg |
1.6 |
src->nhits = 1; src->ntests = 2; /* start probability = 1/2 */ |
| 114 |
greg |
1.1 |
src->so = so; |
| 115 |
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| 116 |
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switch (so->otype) { |
| 117 |
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case OBJ_SOURCE: |
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if (so->oargs.nfargs != 4) |
| 119 |
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objerror(so, USER, "bad arguments"); |
| 120 |
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src->sflags |= SDISTANT; |
| 121 |
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VCOPY(src->sloc, so->oargs.farg); |
| 122 |
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if (normalize(src->sloc) == 0.0) |
| 123 |
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objerror(so, USER, "zero direction"); |
| 124 |
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theta = PI/180.0/2.0 * so->oargs.farg[3]; |
| 125 |
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if (theta <= FTINY) |
| 126 |
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objerror(so, USER, "zero size"); |
| 127 |
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src->ss = theta >= PI/4 ? 1.0 : tan(theta); |
| 128 |
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src->ss2 = 2.0*PI * (1.0 - cos(theta)); |
| 129 |
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break; |
| 130 |
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case OBJ_SPHERE: |
| 131 |
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VCOPY(src->sloc, so->oargs.farg); |
| 132 |
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src->ss = so->oargs.farg[3]; |
| 133 |
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src->ss2 = PI * src->ss * src->ss; |
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break; |
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case OBJ_FACE: |
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/* get the face */ |
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f = getface(so); |
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/* find the center */ |
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for (j = 0; j < 3; j++) { |
| 140 |
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src->sloc[j] = 0.0; |
| 141 |
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for (i = 0; i < f->nv; i++) |
| 142 |
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src->sloc[j] += VERTEX(f,i)[j]; |
| 143 |
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src->sloc[j] /= f->nv; |
| 144 |
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} |
| 145 |
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if (!inface(src->sloc, f)) |
| 146 |
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objerror(so, USER, "cannot hit center"); |
| 147 |
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src->ss = sqrt(f->area / PI); |
| 148 |
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src->ss2 = f->area; |
| 149 |
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break; |
| 150 |
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case OBJ_RING: |
| 151 |
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/* get the ring */ |
| 152 |
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co = getcone(so, 0); |
| 153 |
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VCOPY(src->sloc, CO_P0(co)); |
| 154 |
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if (CO_R0(co) > 0.0) |
| 155 |
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objerror(so, USER, "cannot hit center"); |
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src->ss = CO_R1(co); |
| 157 |
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src->ss2 = PI * src->ss * src->ss; |
| 158 |
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break; |
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default: |
| 160 |
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objerror(so, USER, "illegal material"); |
| 161 |
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} |
| 162 |
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} |
| 163 |
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| 164 |
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greg |
1.6 |
SPOT * |
| 166 |
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makespot(m) /* make a spotlight */ |
| 167 |
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register OBJREC *m; |
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{ |
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extern double cos(); |
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register SPOT *ns; |
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if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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error(SYSTEM, "out of memory in makespot"); |
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ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3])); |
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VCOPY(ns->aim, m->oargs.farg+4); |
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if ((ns->flen = normalize(ns->aim)) == 0.0) |
| 177 |
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objerror(m, USER, "zero focus vector"); |
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return(ns); |
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} |
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greg |
1.1 |
double |
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srcray(sr, r, sn) /* send a ray to a source, return domega */ |
| 184 |
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register RAY *sr; /* returned source ray */ |
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RAY *r; /* ray which hit object */ |
| 186 |
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register int sn; /* source number */ |
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{ |
| 188 |
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register double *norm = NULL; /* plane normal */ |
| 189 |
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double ddot; /* (distance times) cosine */ |
| 190 |
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FVECT vd; |
| 191 |
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double d; |
| 192 |
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register int i; |
| 193 |
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| 194 |
greg |
1.4 |
if (source[sn].sflags & SSKIP) |
| 195 |
greg |
1.1 |
return(0.0); /* skip this source */ |
| 196 |
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| 197 |
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rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
| 198 |
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| 199 |
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sr->rsrc = sn; /* remember source */ |
| 200 |
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/* get source direction */ |
| 201 |
greg |
1.4 |
if (source[sn].sflags & SDISTANT) |
| 202 |
greg |
1.1 |
/* constant direction */ |
| 203 |
greg |
1.4 |
VCOPY(sr->rdir, source[sn].sloc); |
| 204 |
greg |
1.1 |
else { /* compute direction */ |
| 205 |
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for (i = 0; i < 3; i++) |
| 206 |
greg |
1.4 |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
| 207 |
greg |
1.1 |
|
| 208 |
greg |
1.4 |
if (source[sn].so->otype == OBJ_FACE) |
| 209 |
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norm = getface(source[sn].so)->norm; |
| 210 |
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else if (source[sn].so->otype == OBJ_RING) |
| 211 |
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norm = getcone(source[sn].so,0)->ad; |
| 212 |
greg |
1.1 |
|
| 213 |
greg |
1.2 |
if (norm != NULL && (ddot = -DOT(sr->rdir, norm)) <= FTINY) |
| 214 |
greg |
1.1 |
return(0.0); /* behind surface! */ |
| 215 |
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} |
| 216 |
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if (dstrsrc > FTINY) { |
| 217 |
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/* distribute source direction */ |
| 218 |
greg |
1.31 |
dimlist[ndims++] = sn; |
| 219 |
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for (i = 0; i < 3; i++) { |
| 220 |
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dimlist[ndims] = i + 8831; |
| 221 |
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vd[i] = dstrsrc * source[sn].ss * |
| 222 |
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(1.0 - 2.0*urand(ilhash(dimlist,ndims+1)+samplendx)); |
| 223 |
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} |
| 224 |
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ndims--; |
| 225 |
greg |
1.1 |
if (norm != NULL) { /* project offset */ |
| 226 |
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d = DOT(vd, norm); |
| 227 |
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for (i = 0; i < 3; i++) |
| 228 |
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vd[i] -= d * norm[i]; |
| 229 |
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} |
| 230 |
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for (i = 0; i < 3; i++) /* offset source direction */ |
| 231 |
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sr->rdir[i] += vd[i]; |
| 232 |
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| 233 |
greg |
1.4 |
} else if (source[sn].sflags & SDISTANT) |
| 234 |
greg |
1.1 |
/* already normalized */ |
| 235 |
greg |
1.4 |
return(source[sn].ss2); |
| 236 |
greg |
1.1 |
|
| 237 |
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if ((d = normalize(sr->rdir)) == 0.0) |
| 238 |
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/* at source! */ |
| 239 |
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return(0.0); |
| 240 |
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| 241 |
greg |
1.4 |
if (source[sn].sflags & SDISTANT) |
| 242 |
greg |
1.1 |
/* domega constant */ |
| 243 |
greg |
1.4 |
return(source[sn].ss2); |
| 244 |
greg |
1.1 |
|
| 245 |
greg |
1.6 |
/* check proximity */ |
| 246 |
greg |
1.27 |
if (source[sn].sflags & SPROX && |
| 247 |
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d > source[sn].sl.prox) |
| 248 |
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return(0.0); |
| 249 |
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/* compute dot product */ |
| 250 |
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if (norm != NULL) |
| 251 |
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ddot /= d; |
| 252 |
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else |
| 253 |
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ddot = 1.0; |
| 254 |
greg |
1.6 |
/* check angle */ |
| 255 |
greg |
1.27 |
if (source[sn].sflags & SSPOT) { |
| 256 |
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if (source[sn].sl.s->siz < 2.0*PI * |
| 257 |
greg |
1.6 |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
| 258 |
greg |
1.27 |
return(0.0); |
| 259 |
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d += source[sn].sl.s->flen; /* adjust length */ |
| 260 |
greg |
1.1 |
} |
| 261 |
greg |
1.27 |
/* compute domega */ |
| 262 |
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return(ddot*source[sn].ss2/(d*d)); |
| 263 |
greg |
1.1 |
} |
| 264 |
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| 265 |
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| 266 |
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sourcehit(r) /* check to see if ray hit distant source */ |
| 267 |
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register RAY *r; |
| 268 |
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{ |
| 269 |
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int first, last; |
| 270 |
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register int i; |
| 271 |
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| 272 |
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if (r->rsrc >= 0) { /* check only one if aimed */ |
| 273 |
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first = last = r->rsrc; |
| 274 |
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} else { /* otherwise check all */ |
| 275 |
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first = 0; last = nsources-1; |
| 276 |
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} |
| 277 |
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for (i = first; i <= last; i++) |
| 278 |
greg |
1.4 |
if (source[i].sflags & SDISTANT) |
| 279 |
greg |
1.1 |
/* |
| 280 |
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* Check to see if ray is within |
| 281 |
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* solid angle of source. |
| 282 |
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*/ |
| 283 |
greg |
1.4 |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
| 284 |
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<= source[i].ss2) { |
| 285 |
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r->ro = source[i].so; |
| 286 |
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if (!(source[i].sflags & SSKIP)) |
| 287 |
greg |
1.1 |
break; |
| 288 |
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} |
| 289 |
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| 290 |
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if (r->ro != NULL) { |
| 291 |
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for (i = 0; i < 3; i++) |
| 292 |
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r->ron[i] = -r->rdir[i]; |
| 293 |
|
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r->rod = 1.0; |
| 294 |
greg |
1.26 |
r->rox = NULL; |
| 295 |
greg |
1.1 |
return(1); |
| 296 |
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} |
| 297 |
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return(0); |
| 298 |
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} |
| 299 |
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| 300 |
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| 301 |
greg |
1.4 |
static int |
| 302 |
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cntcmp(sc1, sc2) /* contribution compare (descending) */ |
| 303 |
greg |
1.9 |
register CNTPTR *sc1, *sc2; |
| 304 |
greg |
1.4 |
{ |
| 305 |
|
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if (sc1->brt > sc2->brt) |
| 306 |
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return(-1); |
| 307 |
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if (sc1->brt < sc2->brt) |
| 308 |
|
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return(1); |
| 309 |
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return(0); |
| 310 |
|
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} |
| 311 |
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| 312 |
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| 313 |
|
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direct(r, f, p) /* add direct component */ |
| 314 |
|
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RAY *r; /* ray that hit surface */ |
| 315 |
|
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int (*f)(); /* direct component coefficient function */ |
| 316 |
|
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char *p; /* data for f */ |
| 317 |
|
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{ |
| 318 |
greg |
1.12 |
extern double pow(); |
| 319 |
greg |
1.4 |
register int sn; |
| 320 |
greg |
1.12 |
int nshadcheck, ncnts; |
| 321 |
greg |
1.29 |
int nhits; |
| 322 |
|
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double prob, ourthresh, hwt; |
| 323 |
greg |
1.4 |
RAY sr; |
| 324 |
greg |
1.25 |
/* NOTE: srccnt and cntord global so no recursion */ |
| 325 |
greg |
1.22 |
if (nsources <= 0) |
| 326 |
greg |
1.25 |
return; /* no sources?! */ |
| 327 |
greg |
1.12 |
/* compute number to check */ |
| 328 |
|
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nshadcheck = pow((double)nsources, shadcert) + .5; |
| 329 |
greg |
1.8 |
/* modify threshold */ |
| 330 |
|
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ourthresh = shadthresh / r->rweight; |
| 331 |
greg |
1.4 |
/* potential contributions */ |
| 332 |
|
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for (sn = 0; sn < nsources; sn++) { |
| 333 |
greg |
1.9 |
cntord[sn].sno = sn; |
| 334 |
|
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cntord[sn].brt = 0.0; |
| 335 |
greg |
1.4 |
/* get source ray */ |
| 336 |
|
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if ((srccnt[sn].dom = srcray(&sr, r, sn)) == 0.0) |
| 337 |
|
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continue; |
| 338 |
|
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VCOPY(srccnt[sn].dir, sr.rdir); |
| 339 |
|
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/* compute coefficient */ |
| 340 |
|
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(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
| 341 |
greg |
1.9 |
cntord[sn].brt = bright(srccnt[sn].val); |
| 342 |
greg |
1.15 |
if (cntord[sn].brt <= 0.0) |
| 343 |
greg |
1.4 |
continue; |
| 344 |
|
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/* compute intersection */ |
| 345 |
greg |
1.30 |
if (source[sn].sflags & SDISTANT ? |
| 346 |
greg |
1.4 |
sourcehit(&sr) : |
| 347 |
|
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(*ofun[source[sn].so->otype].funp) |
| 348 |
greg |
1.30 |
(source[sn].so, &sr)) { |
| 349 |
|
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if (source[sn].aimsuccess >= 0) |
| 350 |
|
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source[sn].aimsuccess++; |
| 351 |
|
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} else { |
| 352 |
|
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cntord[sn].brt = 0.0; |
| 353 |
|
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if (source[sn].aimsuccess < 0) |
| 354 |
|
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continue; /* bitched already */ |
| 355 |
|
|
source[sn].aimsuccess -= AIMREQT; |
| 356 |
|
|
if (source[sn].aimsuccess >= 0) |
| 357 |
|
|
continue; /* leniency */ |
| 358 |
greg |
1.25 |
sprintf(errmsg, |
| 359 |
|
|
"aiming failure for light source \"%s\"", |
| 360 |
|
|
source[sn].so->oname); |
| 361 |
|
|
error(WARNING, errmsg); |
| 362 |
greg |
1.4 |
continue; |
| 363 |
greg |
1.25 |
} |
| 364 |
greg |
1.4 |
/* compute contribution */ |
| 365 |
greg |
1.19 |
raycont(&sr); |
| 366 |
greg |
1.4 |
multcolor(srccnt[sn].val, sr.rcol); |
| 367 |
greg |
1.9 |
cntord[sn].brt = bright(srccnt[sn].val); |
| 368 |
greg |
1.4 |
} |
| 369 |
|
|
/* sort contributions */ |
| 370 |
greg |
1.9 |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
| 371 |
greg |
1.13 |
{ /* find last */ |
| 372 |
|
|
register int l, m; |
| 373 |
|
|
|
| 374 |
|
|
sn = 0; ncnts = l = nsources; |
| 375 |
|
|
while ((m = (sn + ncnts) >> 1) != l) { |
| 376 |
|
|
if (cntord[m].brt > 0.0) |
| 377 |
|
|
sn = m; |
| 378 |
|
|
else |
| 379 |
|
|
ncnts = m; |
| 380 |
|
|
l = m; |
| 381 |
|
|
} |
| 382 |
|
|
} |
| 383 |
greg |
1.12 |
/* accumulate tail */ |
| 384 |
|
|
for (sn = ncnts-1; sn > 0; sn--) |
| 385 |
|
|
cntord[sn-1].brt += cntord[sn].brt; |
| 386 |
greg |
1.10 |
/* test for shadows */ |
| 387 |
greg |
1.29 |
nhits = 0; |
| 388 |
greg |
1.12 |
for (sn = 0; sn < ncnts; sn++) { |
| 389 |
greg |
1.10 |
/* check threshold */ |
| 390 |
greg |
1.12 |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
| 391 |
greg |
1.27 |
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
| 392 |
|
|
< ourthresh*bright(r->rcol)) |
| 393 |
greg |
1.4 |
break; |
| 394 |
|
|
/* get statistics */ |
| 395 |
greg |
1.9 |
source[cntord[sn].sno].ntests++; |
| 396 |
greg |
1.4 |
/* test for hit */ |
| 397 |
|
|
rayorigin(&sr, r, SHADOW, 1.0); |
| 398 |
greg |
1.9 |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
| 399 |
greg |
1.19 |
sr.rsrc = cntord[sn].sno; |
| 400 |
greg |
1.4 |
if (localhit(&sr, &thescene) && |
| 401 |
greg |
1.9 |
sr.ro != source[cntord[sn].sno].so) { |
| 402 |
greg |
1.4 |
/* check for transmission */ |
| 403 |
greg |
1.19 |
raycont(&sr); |
| 404 |
greg |
1.5 |
if (bright(sr.rcol) <= FTINY) |
| 405 |
greg |
1.4 |
continue; /* missed! */ |
| 406 |
greg |
1.9 |
(*f)(srccnt[cntord[sn].sno].val, p, |
| 407 |
|
|
srccnt[cntord[sn].sno].dir, |
| 408 |
|
|
srccnt[cntord[sn].sno].dom); |
| 409 |
|
|
multcolor(srccnt[cntord[sn].sno].val, sr.rcol); |
| 410 |
greg |
1.4 |
} |
| 411 |
|
|
/* add contribution if hit */ |
| 412 |
greg |
1.9 |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
| 413 |
greg |
1.29 |
nhits++; |
| 414 |
greg |
1.9 |
source[cntord[sn].sno].nhits++; |
| 415 |
greg |
1.4 |
} |
| 416 |
greg |
1.29 |
/* surface hit rate */ |
| 417 |
|
|
if (sn > 0) |
| 418 |
|
|
hwt = (double)nhits / (double)sn; |
| 419 |
|
|
else |
| 420 |
|
|
hwt = 0.5; |
| 421 |
greg |
1.20 |
#ifdef DEBUG |
| 422 |
greg |
1.12 |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
| 423 |
|
|
sn, ncnts-sn, hwt); |
| 424 |
|
|
eputs(errmsg); |
| 425 |
greg |
1.4 |
#endif |
| 426 |
|
|
/* add in untested sources */ |
| 427 |
greg |
1.12 |
for ( ; sn < ncnts; sn++) { |
| 428 |
greg |
1.9 |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
| 429 |
|
|
(double)source[cntord[sn].sno].ntests; |
| 430 |
|
|
scalecolor(srccnt[cntord[sn].sno].val, prob); |
| 431 |
|
|
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
| 432 |
greg |
1.4 |
} |
| 433 |
|
|
} |
| 434 |
|
|
|
| 435 |
|
|
|
| 436 |
greg |
1.1 |
#define wrongsource(m, r) (m->otype!=MAT_ILLUM && \ |
| 437 |
|
|
r->rsrc>=0 && \ |
| 438 |
greg |
1.4 |
source[r->rsrc].so!=r->ro) |
| 439 |
greg |
1.1 |
|
| 440 |
|
|
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
| 441 |
greg |
1.6 |
!(r->rtype&REFLECTED) && /* hack! */\ |
| 442 |
|
|
!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3])) |
| 443 |
greg |
1.1 |
|
| 444 |
|
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
| 445 |
greg |
1.4 |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
| 446 |
greg |
1.1 |
|
| 447 |
|
|
|
| 448 |
|
|
m_light(m, r) /* ray hit a light source */ |
| 449 |
|
|
register OBJREC *m; |
| 450 |
|
|
register RAY *r; |
| 451 |
|
|
{ |
| 452 |
|
|
/* check for over-counting */ |
| 453 |
|
|
if (wrongsource(m, r) || badambient(m, r)) |
| 454 |
|
|
return; |
| 455 |
|
|
/* check for passed illum */ |
| 456 |
|
|
if (passillum(m, r)) { |
| 457 |
|
|
|
| 458 |
|
|
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
| 459 |
|
|
raytrans(r); |
| 460 |
|
|
else |
| 461 |
|
|
rayshade(r, modifier(m->oargs.sarg[0])); |
| 462 |
|
|
|
| 463 |
|
|
/* otherwise treat as source */ |
| 464 |
|
|
} else { |
| 465 |
greg |
1.16 |
/* check for behind */ |
| 466 |
|
|
if (r->rod < 0.0) |
| 467 |
|
|
return; |
| 468 |
greg |
1.1 |
/* get distribution pattern */ |
| 469 |
|
|
raytexture(r, m->omod); |
| 470 |
|
|
/* get source color */ |
| 471 |
|
|
setcolor(r->rcol, m->oargs.farg[0], |
| 472 |
|
|
m->oargs.farg[1], |
| 473 |
|
|
m->oargs.farg[2]); |
| 474 |
|
|
/* modify value */ |
| 475 |
|
|
multcolor(r->rcol, r->pcol); |
| 476 |
|
|
} |
| 477 |
|
|
} |
