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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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* Routines to do the actual calculation for mkillum |
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*/ |
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|
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#include "mkillum.h" |
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#include <string.h> |
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|
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#include "mkillum.h" |
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#include "face.h" |
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|
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#include "cone.h" |
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#include "source.h" |
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|
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#include "random.h" |
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#ifndef NBSDFSAMPS |
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#define NBSDFSAMPS 32 /* BSDF resampling count */ |
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#endif |
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|
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COLORV * distarr = NULL; /* distribution array */ |
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int distsiz = 0; |
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COLORV * direct_discount = NULL; /* amount to take off direct */ |
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|
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< |
o_default(ob, il, rt, nm) /* default illum action */ |
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OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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|
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void |
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newdist( /* allocate & clear distribution array */ |
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int siz |
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) |
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{ |
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if (siz <= 0) { |
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if (distsiz > 0) |
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free((void *)distarr); |
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distarr = NULL; |
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distsiz = 0; |
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return; |
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} |
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if (distsiz < siz) { |
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if (distsiz > 0) |
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free((void *)distarr); |
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distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
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if (distarr == NULL) |
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error(SYSTEM, "out of memory in newdist"); |
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distsiz = siz; |
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} |
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memset(distarr, '\0', sizeof(COLOR)*siz); |
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} |
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|
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|
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static void |
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new_discount() /* allocate space for direct contrib. record */ |
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{ |
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if (distsiz <= 0) |
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return; |
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direct_discount = (COLORV *)calloc(distsiz, sizeof(COLOR)); |
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if (direct_discount == NULL) |
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error(SYSTEM, "out of memory in new_discount"); |
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} |
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|
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|
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static void |
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done_discount() /* clear off direct contrib. record */ |
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{ |
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if (direct_discount == NULL) |
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return; |
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free((void *)direct_discount); |
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direct_discount = NULL; |
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} |
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|
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|
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int |
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process_ray( /* process a ray result or report error */ |
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RAY *r, |
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int rv |
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) |
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{ |
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COLORV *colp; |
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|
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if (rv == 0) /* no result ready */ |
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return(0); |
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if (rv < 0) |
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error(USER, "ray tracing process died"); |
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if (r->rno >= distsiz) |
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error(INTERNAL, "bad returned index in process_ray"); |
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multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
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colp = &distarr[r->rno * 3]; |
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addcolor(colp, r->rcol); |
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if (r->rsrc >= 0 && /* remember source contrib. */ |
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direct_discount != NULL) { |
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colp = &direct_discount[r->rno * 3]; |
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addcolor(colp, r->rcol); |
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} |
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return(1); |
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} |
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|
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|
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void |
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raysamp( /* queue a ray sample */ |
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int ndx, |
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FVECT org, |
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FVECT dir |
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) |
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{ |
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RAY myRay; |
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int rv; |
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|
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if ((ndx < 0) | (ndx >= distsiz)) |
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error(INTERNAL, "bad index in raysamp"); |
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VCOPY(myRay.rorg, org); |
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VCOPY(myRay.rdir, dir); |
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myRay.rmax = .0; |
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rayorigin(&myRay, PRIMARY, NULL, NULL); |
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myRay.rno = ndx; |
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/* queue ray, check result */ |
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process_ray(&myRay, ray_pqueue(&myRay)); |
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} |
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|
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|
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void |
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srcsamps( /* sample sources from this surface position */ |
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struct illum_args *il, |
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FVECT org, |
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FVECT nrm, |
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MAT4 ixfm |
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) |
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{ |
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int nalt, nazi; |
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SRCINDEX si; |
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RAY sr; |
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FVECT v; |
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double d; |
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int i, j; |
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/* get sampling density */ |
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if (il->sampdens <= 0) { |
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nalt = nazi = 1; |
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} else { |
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i = PI * il->sampdens; |
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nalt = sqrt(i/PI) + .5; |
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nazi = PI*nalt + .5; |
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} |
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initsrcindex(&si); /* loop over (sub)sources */ |
140 |
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for ( ; ; ) { |
141 |
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VCOPY(sr.rorg, org); /* pick side to shoot from */ |
142 |
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if (il->sd != NULL) { |
143 |
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int sn = si.sn; |
144 |
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if (si.sp+1 >= si.np) ++sn; |
145 |
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if (sn >= nsources) break; |
146 |
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if (source[sn].sflags & SDISTANT) |
147 |
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d = DOT(source[sn].sloc, nrm); |
148 |
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else { |
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VSUB(v, source[sn].sloc, org); |
150 |
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d = DOT(v, nrm); |
151 |
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} |
152 |
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} else |
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d = 1.0; /* only transmission */ |
154 |
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if (d < 0.0) |
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d = -1.0001*il->thick - 5.*FTINY; |
156 |
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else |
157 |
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d = 5.*FTINY; |
158 |
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for (i = 3; i--; ) |
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sr.rorg[i] += d*nrm[i]; |
160 |
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samplendx++; /* increment sample counter */ |
161 |
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if (!srcray(&sr, NULL, &si)) |
162 |
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break; /* end of sources */ |
163 |
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/* index direction */ |
164 |
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if (ixfm != NULL) |
165 |
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multv3(v, sr.rdir, ixfm); |
166 |
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else |
167 |
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VCOPY(v, sr.rdir); |
168 |
+ |
if (il->sd != NULL) { |
169 |
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i = getBSDF_incndx(il->sd, v); |
170 |
+ |
if (i < 0) |
171 |
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continue; /* must not be important */ |
172 |
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sr.rno = i; |
173 |
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d = 1.0/getBSDF_incohm(il->sd, i); |
174 |
+ |
} else { |
175 |
+ |
if (v[2] >= -FTINY) |
176 |
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continue; /* only sample transmission */ |
177 |
+ |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
178 |
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sr.rno = flatindex(v, nalt, nazi); |
179 |
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d = nalt*nazi*(1./PI) * v[2]; |
180 |
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} |
181 |
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d *= si.dom; /* solid angle correction */ |
182 |
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scalecolor(sr.rcoef, d); |
183 |
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process_ray(&sr, ray_pqueue(&sr)); |
184 |
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} |
185 |
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} |
186 |
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|
187 |
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|
188 |
+ |
void |
189 |
+ |
rayclean() /* finish all pending rays */ |
190 |
+ |
{ |
191 |
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RAY myRay; |
192 |
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|
193 |
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while (process_ray(&myRay, ray_presult(&myRay, 0))) |
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; |
195 |
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} |
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|
197 |
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|
198 |
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static void |
199 |
+ |
mkaxes( /* compute u and v to go with n */ |
200 |
+ |
FVECT u, |
201 |
+ |
FVECT v, |
202 |
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FVECT n |
203 |
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) |
204 |
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{ |
205 |
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register int i; |
206 |
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|
207 |
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v[0] = v[1] = v[2] = 0.0; |
208 |
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for (i = 0; i < 3; i++) |
209 |
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if (n[i] < 0.6 && n[i] > -0.6) |
210 |
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break; |
211 |
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v[i] = 1.0; |
212 |
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fcross(u, v, n); |
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normalize(u); |
214 |
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fcross(v, n, u); |
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} |
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|
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|
218 |
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static void |
219 |
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rounddir( /* compute uniform spherical direction */ |
220 |
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register FVECT dv, |
221 |
+ |
double alt, |
222 |
+ |
double azi |
223 |
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) |
224 |
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{ |
225 |
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double d1, d2; |
226 |
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|
227 |
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dv[2] = 1. - 2.*alt; |
228 |
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d1 = sqrt(1. - dv[2]*dv[2]); |
229 |
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d2 = 2.*PI * azi; |
230 |
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dv[0] = d1*cos(d2); |
231 |
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dv[1] = d1*sin(d2); |
232 |
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} |
233 |
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|
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|
235 |
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void |
236 |
+ |
flatdir( /* compute uniform hemispherical direction */ |
237 |
+ |
FVECT dv, |
238 |
+ |
double alt, |
239 |
+ |
double azi |
240 |
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) |
241 |
+ |
{ |
242 |
+ |
double d1, d2; |
243 |
+ |
|
244 |
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d1 = sqrt(alt); |
245 |
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d2 = 2.*PI * azi; |
246 |
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dv[0] = d1*cos(d2); |
247 |
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dv[1] = d1*sin(d2); |
248 |
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dv[2] = sqrt(1. - alt); |
249 |
+ |
} |
250 |
+ |
|
251 |
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int |
252 |
+ |
flatindex( /* compute index for hemispherical direction */ |
253 |
+ |
FVECT dv, |
254 |
+ |
int nalt, |
255 |
+ |
int nazi |
256 |
+ |
) |
257 |
+ |
{ |
258 |
+ |
double d; |
259 |
+ |
int i, j; |
260 |
+ |
|
261 |
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d = 1.0 - dv[2]*dv[2]; |
262 |
+ |
i = d*nalt; |
263 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
264 |
+ |
if (d < 0.0) d += 1.0; |
265 |
+ |
j = d*nazi + 0.5; |
266 |
+ |
if (j >= nazi) j = 0; |
267 |
+ |
return(i*nazi + j); |
268 |
+ |
} |
269 |
+ |
|
270 |
+ |
|
271 |
+ |
int |
272 |
+ |
my_default( /* default illum action */ |
273 |
+ |
OBJREC *ob, |
274 |
+ |
struct illum_args *il, |
275 |
+ |
char *nm |
276 |
+ |
) |
277 |
+ |
{ |
278 |
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sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
279 |
|
nm, ofun[ob->otype].funame, ob->oname); |
280 |
|
error(WARNING, errmsg); |
281 |
< |
if (!(il->flags & IL_LIGHT)) |
282 |
< |
printobj(il->altmat, ob); |
281 |
> |
printobj(il->altmat, ob); |
282 |
> |
return(1); |
283 |
|
} |
284 |
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|
285 |
|
|
286 |
< |
o_face(ob, il, rt, nm) /* make an illum face */ |
287 |
< |
OBJREC *ob; |
288 |
< |
struct illum_args *il; |
289 |
< |
struct rtproc *rt; |
290 |
< |
char *nm; |
286 |
> |
int |
287 |
> |
my_face( /* make an illum face */ |
288 |
> |
OBJREC *ob, |
289 |
> |
struct illum_args *il, |
290 |
> |
char *nm |
291 |
> |
) |
292 |
|
{ |
293 |
< |
#define MAXMISS (5*n*il->nsamps) |
294 |
< |
int dim[3]; |
42 |
< |
int n, nalt, nazi, h; |
43 |
< |
float *distarr; |
293 |
> |
int dim[2]; |
294 |
> |
int n, nalt, nazi, alti; |
295 |
|
double sp[2], r1, r2; |
296 |
+ |
int h; |
297 |
|
FVECT dn, org, dir; |
298 |
|
FVECT u, v; |
299 |
|
double ur[2], vr[2]; |
300 |
< |
int nmisses; |
301 |
< |
register FACE *fa; |
302 |
< |
register int i, j; |
300 |
> |
MAT4 xfm; |
301 |
> |
int nallow; |
302 |
> |
FACE *fa; |
303 |
> |
int i, j; |
304 |
|
/* get/check arguments */ |
305 |
|
fa = getface(ob); |
306 |
|
if (fa->area == 0.0) { |
307 |
|
freeface(ob); |
308 |
< |
o_default(ob, il, rt, nm); |
56 |
< |
return; |
308 |
> |
return(my_default(ob, il, nm)); |
309 |
|
} |
310 |
|
/* set up sampling */ |
311 |
< |
if (il->sampdens <= 0) |
312 |
< |
nalt = nazi = 1; |
313 |
< |
else { |
314 |
< |
n = PI * il->sampdens; |
315 |
< |
nalt = sqrt(n/PI) + .5; |
316 |
< |
nazi = PI*nalt + .5; |
311 |
> |
if (il->sd != NULL) { |
312 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
313 |
> |
objerror(ob, WARNING, "illegal up direction"); |
314 |
> |
freeface(ob); |
315 |
> |
return(my_default(ob, il, nm)); |
316 |
> |
} |
317 |
> |
n = il->sd->ninc; |
318 |
> |
} else { |
319 |
> |
if (il->sampdens <= 0) { |
320 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
321 |
> |
} else { |
322 |
> |
n = PI * il->sampdens; |
323 |
> |
nalt = sqrt(n/PI) + .5; |
324 |
> |
nazi = PI*nalt + .5; |
325 |
> |
} |
326 |
> |
n = nazi*nalt; |
327 |
|
} |
328 |
< |
n = nalt*nazi; |
329 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
330 |
< |
if (distarr == NULL) |
331 |
< |
error(SYSTEM, "out of memory in o_face"); |
332 |
< |
mkaxes(u, v, fa->norm); |
328 |
> |
newdist(n); |
329 |
> |
/* take first edge >= sqrt(area) */ |
330 |
> |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
331 |
> |
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
332 |
> |
u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
333 |
> |
u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
334 |
> |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
335 |
> |
break; |
336 |
> |
} |
337 |
> |
if (i < fa->nv) { /* got one! -- let's align our axes */ |
338 |
> |
r2 = 1.0/sqrt(r1); |
339 |
> |
u[0] *= r2; u[1] *= r2; u[2] *= r2; |
340 |
> |
fcross(v, fa->norm, u); |
341 |
> |
} else /* oh well, we'll just have to wing it */ |
342 |
> |
mkaxes(u, v, fa->norm); |
343 |
> |
/* now, find limits in (u,v) coordinates */ |
344 |
|
ur[0] = vr[0] = FHUGE; |
345 |
|
ur[1] = vr[1] = -FHUGE; |
346 |
|
for (i = 0; i < fa->nv; i++) { |
353 |
|
} |
354 |
|
dim[0] = random(); |
355 |
|
/* sample polygon */ |
356 |
< |
nmisses = 0; |
357 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
85 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
356 |
> |
nallow = 5*n*il->nsamps; |
357 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
358 |
|
for (i = 0; i < il->nsamps; i++) { |
359 |
< |
/* random direction */ |
360 |
< |
h = ilhash(dim, 3) + i; |
361 |
< |
multisamp(sp, 2, urand(h)); |
362 |
< |
r1 = (dim[1] + sp[0])/nalt; |
363 |
< |
r2 = (dim[2] + sp[1])/nazi; |
364 |
< |
flatdir(dn, r1, r2); |
365 |
< |
for (j = 0; j < 3; j++) |
366 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
367 |
< |
/* random location */ |
359 |
> |
/* randomize direction */ |
360 |
> |
h = ilhash(dim, 2) + i; |
361 |
> |
if (il->sd != NULL) { |
362 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
363 |
> |
} else { |
364 |
> |
multisamp(sp, 2, urand(h)); |
365 |
> |
alti = dim[1]/nazi; |
366 |
> |
r1 = (alti + sp[0])/nalt; |
367 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
368 |
> |
flatdir(dn, r1, r2); |
369 |
> |
for (j = 0; j < 3; j++) |
370 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
371 |
> |
dn[2]*fa->norm[j]; |
372 |
> |
} |
373 |
> |
/* randomize location */ |
374 |
|
do { |
375 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
375 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
376 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
377 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
378 |
|
for (j = 0; j < 3; j++) |
379 |
|
org[j] = r1*u[j] + r2*v[j] |
380 |
|
+ fa->offset*fa->norm[j]; |
381 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
382 |
< |
if (nmisses > MAXMISS) { |
381 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
382 |
> |
if (nallow < 0) { |
383 |
|
objerror(ob, WARNING, "bad aspect"); |
384 |
< |
rt->nrays = 0; |
384 |
> |
rayclean(); |
385 |
|
freeface(ob); |
386 |
< |
free((char *)distarr); |
109 |
< |
o_default(ob, il, rt, nm); |
110 |
< |
return; |
386 |
> |
return(my_default(ob, il, nm)); |
387 |
|
} |
388 |
+ |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
389 |
+ |
r1 = -1.0001*il->thick - 5.*FTINY; |
390 |
+ |
else |
391 |
+ |
r1 = 5.*FTINY; |
392 |
|
for (j = 0; j < 3; j++) |
393 |
< |
org[j] += .001*fa->norm[j]; |
393 |
> |
org[j] += r1*fa->norm[j]; |
394 |
|
/* send sample */ |
395 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
395 |
> |
raysamp(dim[1], org, dir); |
396 |
|
} |
397 |
< |
rayflush(rt); |
397 |
> |
/* add in direct component? */ |
398 |
> |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
399 |
> |
MAT4 ixfm; |
400 |
> |
if (il->sd == NULL) { |
401 |
> |
for (i = 3; i--; ) { |
402 |
> |
ixfm[i][0] = u[i]; |
403 |
> |
ixfm[i][1] = v[i]; |
404 |
> |
ixfm[i][2] = fa->norm[i]; |
405 |
> |
ixfm[i][3] = 0.; |
406 |
> |
} |
407 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
408 |
> |
ixfm[3][3] = 1.; |
409 |
> |
} else { |
410 |
> |
if (!invmat4(ixfm, xfm)) |
411 |
> |
objerror(ob, INTERNAL, |
412 |
> |
"cannot invert BSDF transform"); |
413 |
> |
if (!(il->flags & IL_LIGHT)) |
414 |
> |
new_discount(); |
415 |
> |
} |
416 |
> |
dim[0] = random(); |
417 |
> |
nallow = 10*il->nsamps; |
418 |
> |
for (i = 0; i < il->nsamps; i++) { |
419 |
> |
/* randomize location */ |
420 |
> |
h = dim[0] + samplendx++; |
421 |
> |
do { |
422 |
> |
multisamp(sp, 2, urand(h+nallow)); |
423 |
> |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
424 |
> |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
425 |
> |
for (j = 0; j < 3; j++) |
426 |
> |
org[j] = r1*u[j] + r2*v[j] |
427 |
> |
+ fa->offset*fa->norm[j]; |
428 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
429 |
> |
if (nallow < 0) { |
430 |
> |
objerror(ob, WARNING, "bad aspect"); |
431 |
> |
rayclean(); |
432 |
> |
freeface(ob); |
433 |
> |
return(my_default(ob, il, nm)); |
434 |
> |
} |
435 |
> |
/* sample source rays */ |
436 |
> |
srcsamps(il, org, fa->norm, ixfm); |
437 |
> |
} |
438 |
> |
} |
439 |
> |
/* wait for all rays to finish */ |
440 |
> |
rayclean(); |
441 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
442 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
443 |
> |
nazi = PI*nalt + .5; |
444 |
> |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
445 |
> |
done_discount(); |
446 |
> |
if (!il->sampdens) |
447 |
> |
il->sampdens = nalt*nazi/PI + .999; |
448 |
> |
} |
449 |
|
/* write out the face and its distribution */ |
450 |
< |
if (average(il, distarr, nalt*nazi)) { |
450 |
> |
if (average(il, distarr, n)) { |
451 |
|
if (il->sampdens > 0) |
452 |
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
453 |
|
illumout(il, ob); |
454 |
< |
} else if (!(il->flags & IL_LIGHT)) |
454 |
> |
} else |
455 |
|
printobj(il->altmat, ob); |
456 |
|
/* clean up */ |
457 |
|
freeface(ob); |
458 |
< |
free((char *)distarr); |
128 |
< |
#undef MAXMISS |
458 |
> |
return(0); |
459 |
|
} |
460 |
|
|
461 |
|
|
462 |
< |
o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
463 |
< |
register OBJREC *ob; |
464 |
< |
struct illum_args *il; |
465 |
< |
struct rtproc *rt; |
466 |
< |
char *nm; |
462 |
> |
int |
463 |
> |
my_sphere( /* make an illum sphere */ |
464 |
> |
register OBJREC *ob, |
465 |
> |
struct illum_args *il, |
466 |
> |
char *nm |
467 |
> |
) |
468 |
|
{ |
469 |
|
int dim[3]; |
470 |
|
int n, nalt, nazi; |
140 |
– |
float *distarr; |
471 |
|
double sp[4], r1, r2, r3; |
472 |
|
FVECT org, dir; |
473 |
|
FVECT u, v; |
480 |
|
nalt = nazi = 1; |
481 |
|
else { |
482 |
|
n = 4.*PI * il->sampdens; |
483 |
< |
nalt = sqrt(n/PI) + .5; |
484 |
< |
nazi = PI*nalt + .5; |
483 |
> |
nalt = sqrt(2./PI*n) + .5; |
484 |
> |
nazi = PI/2.*nalt + .5; |
485 |
|
} |
486 |
+ |
if (il->sd != NULL) |
487 |
+ |
objerror(ob, WARNING, "BSDF ignored"); |
488 |
|
n = nalt*nazi; |
489 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
158 |
< |
if (distarr == NULL) |
159 |
< |
error(SYSTEM, "out of memory in o_sphere"); |
489 |
> |
newdist(n); |
490 |
|
dim[0] = random(); |
491 |
|
/* sample sphere */ |
492 |
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
496 |
|
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
497 |
|
/* random direction */ |
498 |
|
r1 = (dim[1] + sp[0])/nalt; |
499 |
< |
r2 = (dim[2] + sp[1])/nazi; |
499 |
> |
r2 = (dim[2] + sp[1] - .5)/nazi; |
500 |
|
rounddir(dir, r1, r2); |
501 |
|
/* random location */ |
502 |
|
mkaxes(u, v, dir); /* yuck! */ |
511 |
|
dir[j] = -dir[j]; |
512 |
|
} |
513 |
|
/* send sample */ |
514 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
514 |
> |
raysamp(dim[1]*nazi+dim[2], org, dir); |
515 |
|
} |
516 |
< |
rayflush(rt); |
516 |
> |
/* wait for all rays to finish */ |
517 |
> |
rayclean(); |
518 |
|
/* write out the sphere and its distribution */ |
519 |
< |
if (average(il, distarr, nalt*nazi)) { |
519 |
> |
if (average(il, distarr, n)) { |
520 |
|
if (il->sampdens > 0) |
521 |
|
roundout(il, distarr, nalt, nazi); |
522 |
|
else |
523 |
|
objerror(ob, WARNING, "diffuse distribution"); |
524 |
|
illumout(il, ob); |
525 |
< |
} else if (!(il->flags & IL_LIGHT)) |
525 |
> |
} else |
526 |
|
printobj(il->altmat, ob); |
527 |
|
/* clean up */ |
528 |
< |
free((char *)distarr); |
528 |
> |
return(1); |
529 |
|
} |
530 |
|
|
531 |
|
|
532 |
< |
o_ring(ob, il, rt, nm) /* make an illum ring */ |
533 |
< |
OBJREC *ob; |
534 |
< |
struct illum_args *il; |
535 |
< |
struct rtproc *rt; |
536 |
< |
char *nm; |
532 |
> |
int |
533 |
> |
my_ring( /* make an illum ring */ |
534 |
> |
OBJREC *ob, |
535 |
> |
struct illum_args *il, |
536 |
> |
char *nm |
537 |
> |
) |
538 |
|
{ |
539 |
< |
int dim[3]; |
540 |
< |
int n, nalt, nazi; |
541 |
< |
float *distarr; |
542 |
< |
double sp[4], r1, r2, r3; |
539 |
> |
int dim[2]; |
540 |
> |
int n, nalt, nazi, alti; |
541 |
> |
double sp[2], r1, r2, r3; |
542 |
> |
int h; |
543 |
|
FVECT dn, org, dir; |
544 |
|
FVECT u, v; |
545 |
< |
register CONE *co; |
546 |
< |
register int i, j; |
545 |
> |
MAT4 xfm; |
546 |
> |
CONE *co; |
547 |
> |
int i, j; |
548 |
|
/* get/check arguments */ |
549 |
|
co = getcone(ob, 0); |
550 |
|
/* set up sampling */ |
551 |
< |
if (il->sampdens <= 0) |
552 |
< |
nalt = nazi = 1; |
553 |
< |
else { |
554 |
< |
n = PI * il->sampdens; |
555 |
< |
nalt = sqrt(n/PI) + .5; |
556 |
< |
nazi = PI*nalt + .5; |
551 |
> |
if (il->sd != NULL) { |
552 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
553 |
> |
objerror(ob, WARNING, "illegal up direction"); |
554 |
> |
freecone(ob); |
555 |
> |
return(my_default(ob, il, nm)); |
556 |
> |
} |
557 |
> |
n = il->sd->ninc; |
558 |
> |
} else { |
559 |
> |
if (il->sampdens <= 0) { |
560 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
561 |
> |
} else { |
562 |
> |
n = PI * il->sampdens; |
563 |
> |
nalt = sqrt(n/PI) + .5; |
564 |
> |
nazi = PI*nalt + .5; |
565 |
> |
} |
566 |
> |
n = nazi*nalt; |
567 |
|
} |
568 |
< |
n = nalt*nazi; |
226 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
227 |
< |
if (distarr == NULL) |
228 |
< |
error(SYSTEM, "out of memory in o_ring"); |
568 |
> |
newdist(n); |
569 |
|
mkaxes(u, v, co->ad); |
570 |
|
dim[0] = random(); |
571 |
|
/* sample disk */ |
572 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
233 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
572 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
573 |
|
for (i = 0; i < il->nsamps; i++) { |
574 |
|
/* next sample point */ |
575 |
< |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
576 |
< |
/* random direction */ |
577 |
< |
r1 = (dim[1] + sp[0])/nalt; |
578 |
< |
r2 = (dim[2] + sp[1])/nalt; |
579 |
< |
flatdir(dn, r1, r2); |
580 |
< |
for (j = 0; j < 3; j++) |
581 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
582 |
< |
/* random location */ |
575 |
> |
h = ilhash(dim,2) + i; |
576 |
> |
/* randomize direction */ |
577 |
> |
if (il->sd != NULL) { |
578 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
579 |
> |
} else { |
580 |
> |
multisamp(sp, 2, urand(h)); |
581 |
> |
alti = dim[1]/nazi; |
582 |
> |
r1 = (alti + sp[0])/nalt; |
583 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
584 |
> |
flatdir(dn, r1, r2); |
585 |
> |
for (j = 0; j < 3; j++) |
586 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
587 |
> |
} |
588 |
> |
/* randomize location */ |
589 |
> |
multisamp(sp, 2, urand(h+8371)); |
590 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
591 |
< |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
592 |
< |
r2 = 2.*PI*sp[3]; |
591 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
592 |
> |
r2 = 2.*PI*sp[1]; |
593 |
|
r1 = r3*cos(r2); |
594 |
|
r2 = r3*sin(r2); |
595 |
+ |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
596 |
+ |
r3 = -1.0001*il->thick - 5.*FTINY; |
597 |
+ |
else |
598 |
+ |
r3 = 5.*FTINY; |
599 |
|
for (j = 0; j < 3; j++) |
600 |
< |
org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
601 |
< |
.001*co->ad[j]; |
252 |
< |
|
600 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
601 |
> |
r3*co->ad[j]; |
602 |
|
/* send sample */ |
603 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
603 |
> |
raysamp(dim[1], org, dir); |
604 |
|
} |
605 |
< |
rayflush(rt); |
605 |
> |
/* add in direct component? */ |
606 |
> |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
607 |
> |
MAT4 ixfm; |
608 |
> |
if (il->sd == NULL) { |
609 |
> |
for (i = 3; i--; ) { |
610 |
> |
ixfm[i][0] = u[i]; |
611 |
> |
ixfm[i][1] = v[i]; |
612 |
> |
ixfm[i][2] = co->ad[i]; |
613 |
> |
ixfm[i][3] = 0.; |
614 |
> |
} |
615 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
616 |
> |
ixfm[3][3] = 1.; |
617 |
> |
} else { |
618 |
> |
if (!invmat4(ixfm, xfm)) |
619 |
> |
objerror(ob, INTERNAL, |
620 |
> |
"cannot invert BSDF transform"); |
621 |
> |
if (!(il->flags & IL_LIGHT)) |
622 |
> |
new_discount(); |
623 |
> |
} |
624 |
> |
dim[0] = random(); |
625 |
> |
for (i = 0; i < il->nsamps; i++) { |
626 |
> |
/* randomize location */ |
627 |
> |
h = dim[0] + samplendx++; |
628 |
> |
multisamp(sp, 2, urand(h)); |
629 |
> |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
630 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
631 |
> |
r2 = 2.*PI*sp[1]; |
632 |
> |
r1 = r3*cos(r2); |
633 |
> |
r2 = r3*sin(r2); |
634 |
> |
for (j = 0; j < 3; j++) |
635 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
636 |
> |
/* sample source rays */ |
637 |
> |
srcsamps(il, org, co->ad, ixfm); |
638 |
> |
} |
639 |
> |
} |
640 |
> |
/* wait for all rays to finish */ |
641 |
> |
rayclean(); |
642 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
643 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
644 |
> |
nazi = PI*nalt + .5; |
645 |
> |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
646 |
> |
done_discount(); |
647 |
> |
if (!il->sampdens) |
648 |
> |
il->sampdens = nalt*nazi/PI + .999; |
649 |
> |
} |
650 |
|
/* write out the ring and its distribution */ |
651 |
< |
if (average(il, distarr, nalt*nazi)) { |
651 |
> |
if (average(il, distarr, n)) { |
652 |
|
if (il->sampdens > 0) |
653 |
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
654 |
|
illumout(il, ob); |
655 |
< |
} else if (!(il->flags & IL_LIGHT)) |
655 |
> |
} else |
656 |
|
printobj(il->altmat, ob); |
657 |
|
/* clean up */ |
658 |
|
freecone(ob); |
659 |
< |
free((char *)distarr); |
659 |
> |
return(1); |
660 |
|
} |
661 |
|
|
662 |
|
|
663 |
< |
raysamp(res, org, dir, rt) /* compute a ray sample */ |
664 |
< |
float res[3]; |
665 |
< |
FVECT org, dir; |
666 |
< |
register struct rtproc *rt; |
663 |
> |
void |
664 |
> |
redistribute( /* pass distarr ray sums through BSDF */ |
665 |
> |
struct BSDF_data *b, |
666 |
> |
int nalt, |
667 |
> |
int nazi, |
668 |
> |
FVECT u, |
669 |
> |
FVECT v, |
670 |
> |
FVECT w, |
671 |
> |
MAT4 xm |
672 |
> |
) |
673 |
|
{ |
674 |
< |
register float *fp; |
675 |
< |
|
676 |
< |
if (rt->nrays == rt->bsiz) |
677 |
< |
rayflush(rt); |
678 |
< |
rt->dest[rt->nrays] = res; |
679 |
< |
fp = rt->buf + 6*rt->nrays++; |
680 |
< |
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
681 |
< |
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
682 |
< |
} |
683 |
< |
|
684 |
< |
|
685 |
< |
rayflush(rt) /* flush buffered rays */ |
686 |
< |
register struct rtproc *rt; |
687 |
< |
{ |
688 |
< |
register int i; |
689 |
< |
|
690 |
< |
if (rt->nrays <= 0) |
691 |
< |
return; |
692 |
< |
bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
693 |
< |
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
694 |
< |
3*sizeof(float)*rt->nrays, |
296 |
< |
6*sizeof(float)*(rt->nrays+1)) < |
297 |
< |
3*sizeof(float)*rt->nrays ) |
298 |
< |
error(SYSTEM, "error reading from rtrace process"); |
299 |
< |
i = rt->nrays; |
300 |
< |
while (i--) { |
301 |
< |
rt->dest[i][0] += rt->buf[3*i]; |
302 |
< |
rt->dest[i][1] += rt->buf[3*i+1]; |
303 |
< |
rt->dest[i][2] += rt->buf[3*i+2]; |
674 |
> |
int nout = 0; |
675 |
> |
MAT4 mymat, inmat; |
676 |
> |
COLORV *idist; |
677 |
> |
COLORV *cp; |
678 |
> |
FVECT dv; |
679 |
> |
double wt; |
680 |
> |
int i, j, k, c, o; |
681 |
> |
COLOR col, cinc; |
682 |
> |
/* copy incoming distribution */ |
683 |
> |
if (b->ninc > distsiz) |
684 |
> |
error(INTERNAL, "error 1 in redistribute"); |
685 |
> |
idist = (COLORV *)malloc(sizeof(COLOR)*b->ninc); |
686 |
> |
if (idist == NULL) |
687 |
> |
error(SYSTEM, "out of memory in redistribute"); |
688 |
> |
memcpy(idist, distarr, sizeof(COLOR)*b->ninc); |
689 |
> |
/* compose direction transform */ |
690 |
> |
for (i = 3; i--; ) { |
691 |
> |
mymat[i][0] = u[i]; |
692 |
> |
mymat[i][1] = v[i]; |
693 |
> |
mymat[i][2] = w[i]; |
694 |
> |
mymat[i][3] = 0.; |
695 |
|
} |
696 |
< |
rt->nrays = 0; |
697 |
< |
} |
698 |
< |
|
699 |
< |
|
700 |
< |
mkaxes(u, v, n) /* compute u and v to go with n */ |
701 |
< |
FVECT u, v, n; |
702 |
< |
{ |
703 |
< |
register int i; |
704 |
< |
|
705 |
< |
v[0] = v[1] = v[2] = 0.0; |
706 |
< |
for (i = 0; i < 3; i++) |
707 |
< |
if (n[i] < 0.6 && n[i] > -0.6) |
708 |
< |
break; |
709 |
< |
v[i] = 1.0; |
710 |
< |
fcross(u, v, n); |
711 |
< |
normalize(u); |
712 |
< |
fcross(v, n, u); |
713 |
< |
} |
714 |
< |
|
715 |
< |
|
716 |
< |
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
717 |
< |
register FVECT dv; |
718 |
< |
double alt, azi; |
719 |
< |
{ |
720 |
< |
double d1, d2; |
721 |
< |
|
722 |
< |
dv[2] = 1. - 2.*alt; |
723 |
< |
d1 = sqrt(1. - dv[2]*dv[2]); |
724 |
< |
d2 = 2.*PI * azi; |
725 |
< |
dv[0] = d1*cos(d2); |
726 |
< |
dv[1] = d1*sin(d2); |
727 |
< |
} |
728 |
< |
|
729 |
< |
|
730 |
< |
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
731 |
< |
register FVECT dv; |
732 |
< |
double alt, azi; |
733 |
< |
{ |
734 |
< |
double d1, d2; |
735 |
< |
|
736 |
< |
d1 = sqrt(alt); |
737 |
< |
d2 = 2.*PI * azi; |
738 |
< |
dv[0] = d1*cos(d2); |
739 |
< |
dv[1] = d1*sin(d2); |
740 |
< |
dv[2] = sqrt(1. - alt); |
696 |
> |
mymat[3][0] = mymat[3][1] = mymat[3][2] = 0.; |
697 |
> |
mymat[3][3] = 1.; |
698 |
> |
if (xm != NULL) |
699 |
> |
multmat4(mymat, xm, mymat); |
700 |
> |
for (i = 3; i--; ) { /* make sure it's normalized */ |
701 |
> |
wt = 1./sqrt( mymat[0][i]*mymat[0][i] + |
702 |
> |
mymat[1][i]*mymat[1][i] + |
703 |
> |
mymat[2][i]*mymat[2][i] ); |
704 |
> |
for (j = 3; j--; ) |
705 |
> |
mymat[j][i] *= wt; |
706 |
> |
} |
707 |
> |
if (!invmat4(inmat, mymat)) /* need inverse as well */ |
708 |
> |
error(INTERNAL, "cannot invert BSDF transform"); |
709 |
> |
newdist(nalt*nazi); /* resample distribution */ |
710 |
> |
for (i = b->ninc; i--; ) { |
711 |
> |
int direct_out = -1; |
712 |
> |
COLOR cdir; |
713 |
> |
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
714 |
> |
multv3(dv, dv, mymat); |
715 |
> |
if (dv[2] < 0.0) { |
716 |
> |
dv[0] = -dv[0]; dv[1] = -dv[1]; dv[2] = -dv[2]; |
717 |
> |
direct_out += (direct_discount != NULL); |
718 |
> |
} |
719 |
> |
wt = getBSDF_incohm(b, i); |
720 |
> |
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
721 |
> |
cp = &idist[3*i]; |
722 |
> |
copycolor(cinc, cp); |
723 |
> |
scalecolor(cinc, wt); |
724 |
> |
if (!direct_out) { /* discount direct contr. */ |
725 |
> |
cp = &direct_discount[3*i]; |
726 |
> |
copycolor(cdir, cp); |
727 |
> |
scalecolor(cdir, -wt); |
728 |
> |
direct_out = flatindex(dv, nalt, nazi); |
729 |
> |
} |
730 |
> |
for (k = nalt; k--; ) /* loop over distribution */ |
731 |
> |
for (j = nazi; j--; ) { |
732 |
> |
int rstart = random(); |
733 |
> |
for (c = NBSDFSAMPS; c--; ) { |
734 |
> |
double sp[2]; |
735 |
> |
multisamp(sp, 2, urand(rstart+c)); |
736 |
> |
flatdir(dv, (k + sp[0])/nalt, |
737 |
> |
(j + .5 - sp[1])/nazi); |
738 |
> |
multv3(dv, dv, inmat); |
739 |
> |
/* evaluate BSDF @ outgoing */ |
740 |
> |
o = getBSDF_outndx(b, dv); |
741 |
> |
if (o < 0) { |
742 |
> |
nout++; |
743 |
> |
continue; |
744 |
> |
} |
745 |
> |
wt = BSDF_value(b, i, o) * (1./NBSDFSAMPS); |
746 |
> |
copycolor(col, cinc); |
747 |
> |
o = k*nazi + j; |
748 |
> |
if (o == direct_out) |
749 |
> |
addcolor(col, cdir); /* minus direct */ |
750 |
> |
scalecolor(col, wt); |
751 |
> |
cp = &distarr[3*o]; |
752 |
> |
addcolor(cp, col); /* sum into distribution */ |
753 |
> |
} |
754 |
> |
} |
755 |
> |
} |
756 |
> |
free(idist); /* free temp space */ |
757 |
> |
if (nout) { |
758 |
> |
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
759 |
> |
100.*nout/(b->ninc*nalt*nazi*NBSDFSAMPS)); |
760 |
> |
error(WARNING, errmsg); |
761 |
> |
} |
762 |
|
} |