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/* Copyright (c) 1991 Regents of the University of California */ |
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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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} |
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src->srad = sqrt(src->srad); |
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/* compute size vectors */ |
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if (f->nv == 4 || (f->nv == 5 && /* parallelogram case */ |
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dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY)) |
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if (f->nv == 4) /* parallelogram case */ |
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for (j = 0; j < 3; j++) { |
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src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]); |
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src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]); |
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for (i = 0; i < 3; i++) |
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src->ss[SU][i] = src->ss[SV][i] = src->ss[SW][i] = 0.0; |
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for (i = 0; i < 3; i++) |
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src->ss[i][i] = .886227 * so->oargs.farg[3]; |
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src->ss[i][i] = .7236 * so->oargs.farg[3]; |
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} |
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co = getcone(so, 0); |
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if (CO_R0(co) > .2*co->al) /* heuristic constraint */ |
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objerror(so, WARNING, "source aspect too small"); |
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src->sflags |= SCYL; |
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for (i = 0; i < 3; i++) |
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src->sloc[i] = .5 * (CO_P1(co)[i] + CO_P0(co)[i]); |
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src->srad = co->al; |
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src->srad = .5*co->al; |
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src->ss2 = 2.*CO_R0(co)*co->al; |
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/* set sampling vectors */ |
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for (i = 0; i < 3; i++) |
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fcross(src->ss[SW], src->ss[SV], co->ad); |
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normalize(src->ss[SW]); |
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for (i = 0; i < 3; i++) |
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src->ss[SW][i] *= .886227 * CO_R0(co); |
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src->ss[SW][i] *= .8559 * CO_R0(co); |
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fcross(src->ss[SV], src->ss[SW], co->ad); |
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} |
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{ |
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register SPOT *ns; |
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if ((ns = (SPOT *)m->os) != NULL) |
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return(ns); |
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if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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return(NULL); |
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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) |
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objerror(m, USER, "zero focus vector"); |
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m->os = (char *)ns; |
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return(ns); |
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} |
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spotout(r, s) /* check if we're outside spot region */ |
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register RAY *r; |
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register SPOT *s; |
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{ |
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double d; |
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FVECT vd; |
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|
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if (s == NULL) |
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return(0); |
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if (s->flen < -FTINY) { /* distant source */ |
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vd[0] = s->aim[0] - r->rorg[0]; |
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vd[1] = s->aim[1] - r->rorg[1]; |
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vd[2] = s->aim[2] - r->rorg[2]; |
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d = DOT(r->rdir,vd); |
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/* wrong side? |
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if (d <= FTINY) |
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return(1); */ |
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d = DOT(vd,vd) - d*d; |
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if (PI*d > s->siz) |
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return(1); /* out */ |
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return(0); /* OK */ |
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} |
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/* local source */ |
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if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir))) |
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return(1); /* out */ |
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return(0); /* OK */ |
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} |
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|
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|
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double |
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fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
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FVECT ocent; |
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for (i = 0; i < 3; i++) |
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cc[i] = c1[i] + l*disp[i]; |
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return(a2); |
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} |
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sourcehit(r) /* check to see if ray hit distant source */ |
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register RAY *r; |
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{ |
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int first, last; |
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register int i; |
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|
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if (r->rsrc >= 0) { /* check only one if aimed */ |
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first = last = r->rsrc; |
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} else { /* otherwise check all */ |
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first = 0; last = nsources-1; |
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} |
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for (i = first; i <= last; i++) |
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if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
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/* |
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* Check to see if ray is within |
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* solid angle of source. |
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*/ |
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if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
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<= source[i].ss2) { |
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r->ro = source[i].so; |
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if (!(source[i].sflags & SSKIP)) |
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break; |
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} |
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if (r->ro != NULL) { |
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for (i = 0; i < 3; i++) |
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r->ron[i] = -r->rdir[i]; |
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r->rod = 1.0; |
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r->rox = NULL; |
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return(1); |
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} |
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return(0); |
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} |
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#define wrongsource(m, r) (r->rsrc>=0 && \ |
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source[r->rsrc].so!=r->ro && \ |
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(m->otype!=MAT_ILLUM || \ |
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objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM)) |
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#define distglow(m, r) (m->otype==MAT_GLOW && \ |
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r->rot > m->oargs.farg[3]) |
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#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
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!distglow(m, r)) |
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|
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#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
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!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
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|
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#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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|
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|
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m_light(m, r) /* ray hit a light source */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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/* check for over-counting */ |
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if (wrongsource(m, r) || badambient(m, r)) |
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return; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
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if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
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raytrans(r); |
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else |
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rayshade(r, modifier(m->oargs.sarg[0])); |
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return; |
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} |
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/* otherwise treat as source */ |
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/* check for behind */ |
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if (r->rod < 0.0) |
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return; |
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/* check for invisibility */ |
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if (srcignore(m, r)) |
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return; |
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/* get distribution pattern */ |
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raytexture(r, m->omod); |
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/* get source color */ |
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setcolor(r->rcol, m->oargs.farg[0], |
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m->oargs.farg[1], |
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m->oargs.farg[2]); |
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/* modify value */ |
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multcolor(r->rcol, r->pcol); |
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} |
