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/* Copyright (c) 1991 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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/* |
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* Support routines for source objects and materials |
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* |
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* External symbols declared in source.h |
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*/ |
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#include "copyright.h" |
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|
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#include "ray.h" |
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#include "otypes.h" |
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#include "face.h" |
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#define SRCINC 8 /* realloc increment for array */ |
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SRCREC *source = NULL; /* our list of sources */ |
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int nsources = 0; /* the number of sources */ |
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SRCFUNC sfun[NUMOTYPE]; /* source dispatch table */ |
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void |
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initstypes() /* initialize source dispatch table */ |
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{ |
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extern VSMATERIAL mirror_vs; |
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extern int fsetsrc(), ssetsrc(), sphsetsrc(), rsetsrc(); |
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extern double fgetplaneq(), rgetplaneq(); |
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extern double fgetmaxdisk(), rgetmaxdisk(); |
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static SOBJECT fsobj = {fsetsrc, fgetplaneq, fgetmaxdisk}; |
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static SOBJECT ssobj = {ssetsrc}; |
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static SOBJECT sphsobj = {sphsetsrc}; |
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static SOBJECT rsobj = {rsetsrc, rgetplaneq, rgetmaxdisk}; |
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extern VSMATERIAL mirror_vs, direct1_vs, direct2_vs; |
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static SOBJECT fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk}; |
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static SOBJECT ssobj = {ssetsrc, nopart}; |
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static SOBJECT sphsobj = {sphsetsrc, nopart}; |
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static SOBJECT cylsobj = {cylsetsrc, cylpart}; |
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static SOBJECT rsobj = {rsetsrc, flatpart, rgetplaneq, rgetmaxdisk}; |
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|
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sfun[MAT_MIRROR].mf = &mirror_vs; |
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sfun[MAT_DIRECT1].mf = &direct1_vs; |
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sfun[MAT_DIRECT2].mf = &direct2_vs; |
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sfun[OBJ_FACE].of = &fsobj; |
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sfun[OBJ_SOURCE].of = &ssobj; |
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sfun[OBJ_SPHERE].of = &sphsobj; |
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sfun[OBJ_CYLINDER].of = &cylsobj; |
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sfun[OBJ_RING].of = &rsobj; |
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} |
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newsource() /* allocate new source in our array */ |
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{ |
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if (nsources == 0) |
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source = (SRCREC *)malloc(sizeof(SRCREC)); |
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else |
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source = (SRCREC *)realloc((char *)source, |
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(unsigned)(nsources+1)*sizeof(SRCREC)); |
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source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC)); |
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else if (nsources%SRCINC == 0) |
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source = (SRCREC *)realloc((void *)source, |
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(unsigned)(nsources+SRCINC)*sizeof(SRCREC)); |
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if (source == NULL) |
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return(-1); |
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source[nsources].sflags = 0; |
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source[nsources].nhits = 1; |
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source[nsources].ntests = 2; /* initial hit probability = 1/2 */ |
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source[nsources].ntests = 2; /* initial hit probability = 50% */ |
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#if SHADCACHE |
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source[nsources].obscache = NULL; |
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#endif |
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return(nsources++); |
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} |
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void |
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setflatss(src) /* set sampling for a flat source */ |
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register SRCREC *src; |
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{ |
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double mult; |
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register int i; |
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|
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src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0; |
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for (i = 0; i < 3; i++) |
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if (src->snorm[i] < 0.6 && src->snorm[i] > -0.6) |
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break; |
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src->ss[SV][i] = 1.0; |
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fcross(src->ss[SU], src->ss[SV], src->snorm); |
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mult = .5 * sqrt( src->ss2 / DOT(src->ss[SU],src->ss[SU]) ); |
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for (i = 0; i < 3; i++) |
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src->ss[SU][i] *= mult; |
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fcross(src->ss[SV], src->snorm, src->ss[SU]); |
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} |
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|
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|
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void |
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fsetsrc(src, so) /* set a face as a source */ |
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register SRCREC *src; |
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OBJREC *so; |
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{ |
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register FACE *f; |
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register int i, j; |
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double d; |
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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
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src->so = so; |
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/* get the face */ |
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f = getface(so); |
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if (f->area == 0.0) |
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objerror(so, USER, "zero source area"); |
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/* find the center */ |
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for (j = 0; j < 3; j++) { |
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src->sloc[j] = 0.0; |
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src->sloc[j] /= (double)f->nv; |
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} |
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if (!inface(src->sloc, f)) |
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objerror(so, USER, "cannot hit center"); |
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objerror(so, USER, "cannot hit source center"); |
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src->sflags |= SFLAT; |
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VCOPY(src->snorm, f->norm); |
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src->ss = sqrt(f->area / PI); |
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src->ss2 = f->area; |
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/* find maximum radius */ |
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src->srad = 0.; |
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for (i = 0; i < f->nv; i++) { |
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d = dist2(VERTEX(f,i), src->sloc); |
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if (d > src->srad) |
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src->srad = d; |
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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) /* 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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} |
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else |
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setflatss(src); |
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} |
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void |
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ssetsrc(src, so) /* set a source as a source */ |
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register SRCREC *src; |
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register OBJREC *so; |
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theta = PI/180.0/2.0 * so->oargs.farg[3]; |
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if (theta <= FTINY) |
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objerror(so, USER, "zero size"); |
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src->ss = theta >= PI/4.0 ? 1.0 : tan(theta); |
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src->ss2 = 2.0*PI * (1.0 - cos(theta)); |
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/* the following is approximate */ |
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src->srad = sqrt(src->ss2/PI); |
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VCOPY(src->snorm, src->sloc); |
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setflatss(src); /* hey, whatever works */ |
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src->ss[SW][0] = src->ss[SW][1] = src->ss[SW][2] = 0.0; |
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} |
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|
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void |
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sphsetsrc(src, so) /* set a sphere as a source */ |
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register SRCREC *src; |
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register OBJREC *so; |
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{ |
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register int i; |
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|
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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
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src->so = so; |
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if (so->oargs.nfargs != 4) |
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objerror(so, USER, "bad # arguments"); |
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if (so->oargs.farg[3] <= FTINY) |
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objerror(so, USER, "illegal radius"); |
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> |
objerror(so, USER, "illegal source radius"); |
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VCOPY(src->sloc, so->oargs.farg); |
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< |
src->ss = so->oargs.farg[3]; |
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src->ss2 = PI * src->ss * src->ss; |
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> |
src->srad = so->oargs.farg[3]; |
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src->ss2 = PI * src->srad * src->srad; |
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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] = .7236 * so->oargs.farg[3]; |
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} |
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void |
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rsetsrc(src, so) /* set a ring (disk) as a source */ |
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register SRCREC *src; |
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OBJREC *so; |
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src->so = so; |
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/* get the ring */ |
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co = getcone(so, 0); |
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if (CO_R1(co) <= FTINY) |
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objerror(so, USER, "illegal source radius"); |
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VCOPY(src->sloc, CO_P0(co)); |
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if (CO_R0(co) > 0.0) |
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objerror(so, USER, "cannot hit center"); |
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objerror(so, USER, "cannot hit source center"); |
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src->sflags |= SFLAT; |
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VCOPY(src->snorm, co->ad); |
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src->ss = CO_R1(co); |
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src->ss2 = PI * src->ss * src->ss; |
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src->srad = CO_R1(co); |
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src->ss2 = PI * src->srad * src->srad; |
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setflatss(src); |
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} |
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void |
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cylsetsrc(src, so) /* set a cylinder as a source */ |
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register SRCREC *src; |
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OBJREC *so; |
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{ |
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register CONE *co; |
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register int i; |
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|
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src->sa.success = 4*AIMREQT-1; /* bitch on fourth failure */ |
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src->so = so; |
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/* get the cylinder */ |
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co = getcone(so, 0); |
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if (CO_R0(co) <= FTINY) |
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objerror(so, USER, "illegal source radius"); |
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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 = .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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src->ss[SU][i] = .5 * co->al * co->ad[i]; |
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src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0; |
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for (i = 0; i < 3; i++) |
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if (co->ad[i] < 0.6 && co->ad[i] > -0.6) |
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break; |
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src->ss[SV][i] = 1.0; |
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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] *= .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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|
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SPOT * |
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makespot(m) /* make a spotlight */ |
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register OBJREC *m; |
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{ |
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register SPOT *ns; |
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|
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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); |
| 258 |
+ |
if (m->oargs.farg[3] <= FTINY) |
| 259 |
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objerror(m, USER, "zero angle"); |
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ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3])); |
| 261 |
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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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|
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|
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int |
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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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+ |
|
| 277 |
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if (s == NULL) |
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return(0); |
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+ |
if (s->flen < -FTINY) { /* distant source */ |
| 280 |
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vd[0] = s->aim[0] - r->rorg[0]; |
| 281 |
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vd[1] = s->aim[1] - r->rorg[1]; |
| 282 |
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vd[2] = s->aim[2] - r->rorg[2]; |
| 283 |
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d = DOT(r->rdir,vd); |
| 284 |
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/* wrong side? |
| 285 |
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if (d <= FTINY) |
| 286 |
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return(1); */ |
| 287 |
+ |
d = DOT(vd,vd) - d*d; |
| 288 |
+ |
if (PI*d > s->siz) |
| 289 |
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return(1); /* out */ |
| 290 |
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return(0); /* OK */ |
| 291 |
+ |
} |
| 292 |
+ |
/* local source */ |
| 293 |
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if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir))) |
| 294 |
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return(1); /* out */ |
| 295 |
+ |
return(0); /* OK */ |
| 296 |
+ |
} |
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+ |
|
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+ |
|
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double |
| 300 |
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fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
| 301 |
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FVECT ocent; |
| 367 |
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} |
| 368 |
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|
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|
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+ |
int |
| 371 |
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commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
| 372 |
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register SPOT *sp1, *sp2; |
| 373 |
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FVECT org; |
| 391 |
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} |
| 392 |
|
|
| 393 |
|
|
| 394 |
+ |
int |
| 395 |
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commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
| 396 |
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register SPOT *sp1, *sp2; |
| 397 |
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FVECT dir; |
| 416 |
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} |
| 417 |
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|
| 418 |
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|
| 419 |
+ |
int |
| 420 |
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checkspot(sp, nrm) /* check spotlight for behind source */ |
| 421 |
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register SPOT *sp; /* spotlight */ |
| 422 |
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FVECT nrm; /* source surface normal */ |
| 512 |
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for (i = 0; i < 3; i++) |
| 513 |
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cc[i] = c1[i] + l*disp[i]; |
| 514 |
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return(a2); |
| 378 |
– |
} |
| 379 |
– |
|
| 380 |
– |
|
| 381 |
– |
sourcehit(r) /* check to see if ray hit distant source */ |
| 382 |
– |
register RAY *r; |
| 383 |
– |
{ |
| 384 |
– |
int first, last; |
| 385 |
– |
register int i; |
| 386 |
– |
|
| 387 |
– |
if (r->rsrc >= 0) { /* check only one if aimed */ |
| 388 |
– |
first = last = r->rsrc; |
| 389 |
– |
} else { /* otherwise check all */ |
| 390 |
– |
first = 0; last = nsources-1; |
| 391 |
– |
} |
| 392 |
– |
for (i = first; i <= last; i++) |
| 393 |
– |
if (source[i].sflags & SDISTANT) |
| 394 |
– |
/* |
| 395 |
– |
* Check to see if ray is within |
| 396 |
– |
* solid angle of source. |
| 397 |
– |
*/ |
| 398 |
– |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
| 399 |
– |
<= source[i].ss2) { |
| 400 |
– |
r->ro = source[i].so; |
| 401 |
– |
if (!(source[i].sflags & SSKIP)) |
| 402 |
– |
break; |
| 403 |
– |
} |
| 404 |
– |
|
| 405 |
– |
if (r->ro != NULL) { |
| 406 |
– |
for (i = 0; i < 3; i++) |
| 407 |
– |
r->ron[i] = -r->rdir[i]; |
| 408 |
– |
r->rod = 1.0; |
| 409 |
– |
r->rox = NULL; |
| 410 |
– |
return(1); |
| 411 |
– |
} |
| 412 |
– |
return(0); |
| 413 |
– |
} |
| 414 |
– |
|
| 415 |
– |
|
| 416 |
– |
#define wrongsource(m, r) (m->otype!=MAT_ILLUM && \ |
| 417 |
– |
r->rsrc>=0 && \ |
| 418 |
– |
source[r->rsrc].so!=r->ro) |
| 419 |
– |
|
| 420 |
– |
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
| 421 |
– |
!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3])) |
| 422 |
– |
|
| 423 |
– |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
| 424 |
– |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
| 425 |
– |
|
| 426 |
– |
|
| 427 |
– |
m_light(m, r) /* ray hit a light source */ |
| 428 |
– |
register OBJREC *m; |
| 429 |
– |
register RAY *r; |
| 430 |
– |
{ |
| 431 |
– |
/* check for over-counting */ |
| 432 |
– |
if (wrongsource(m, r) || badambient(m, r)) |
| 433 |
– |
return; |
| 434 |
– |
/* check for passed illum */ |
| 435 |
– |
if (passillum(m, r)) { |
| 436 |
– |
|
| 437 |
– |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
| 438 |
– |
raytrans(r); |
| 439 |
– |
else |
| 440 |
– |
rayshade(r, modifier(m->oargs.sarg[0])); |
| 441 |
– |
|
| 442 |
– |
/* otherwise treat as source */ |
| 443 |
– |
} else { |
| 444 |
– |
/* check for behind */ |
| 445 |
– |
if (r->rod < 0.0) |
| 446 |
– |
return; |
| 447 |
– |
/* get distribution pattern */ |
| 448 |
– |
raytexture(r, m->omod); |
| 449 |
– |
/* get source color */ |
| 450 |
– |
setcolor(r->rcol, m->oargs.farg[0], |
| 451 |
– |
m->oargs.farg[1], |
| 452 |
– |
m->oargs.farg[2]); |
| 453 |
– |
/* modify value */ |
| 454 |
– |
multcolor(r->rcol, r->pcol); |
| 455 |
– |
} |
| 515 |
|
} |
