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/* specularity flags */ |
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#define SP_REFL 01 /* has reflected specular component */ |
45 |
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#define SP_TRAN 02 /* has transmitted specular */ |
46 |
< |
#define SP_PURE 010 /* purely specular (zero roughness) */ |
47 |
< |
#define SP_FLAT 020 /* flat reflecting surface */ |
48 |
< |
#define SP_RBLT 040 /* reflection below sample threshold */ |
49 |
< |
#define SP_TBLT 0100 /* transmission below threshold */ |
46 |
> |
#define SP_PURE 04 /* purely specular (zero roughness) */ |
47 |
> |
#define SP_FLAT 010 /* flat reflecting surface */ |
48 |
> |
#define SP_RBLT 020 /* reflection below sample threshold */ |
49 |
> |
#define SP_TBLT 040 /* transmission below threshold */ |
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|
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typedef struct { |
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OBJREC *mp; /* material pointer */ |
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+ |
RAY *rp; /* ray pointer */ |
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short specfl; /* specularity flags, defined above */ |
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COLOR mcolor; /* color of this material */ |
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COLOR scolor; /* color of specular component */ |
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double omega; /* light source size */ |
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{ |
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double ldot; |
75 |
< |
double dtmp; |
76 |
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int i; |
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> |
double dtmp, d2; |
76 |
> |
FVECT vtmp; |
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COLOR ctmp; |
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|
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setcolor(cval, 0.0, 0.0, 0.0); |
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* gaussian distribution model. |
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*/ |
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/* roughness */ |
103 |
< |
dtmp = 2.0*np->alpha2; |
103 |
> |
dtmp = np->alpha2; |
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/* + source if flat */ |
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if (np->specfl & SP_FLAT) |
106 |
< |
dtmp += omega/(2.0*PI); |
106 |
> |
dtmp += omega/(4.0*PI); |
107 |
> |
/* delta */ |
108 |
> |
vtmp[0] = ldir[0] - np->rp->rdir[0]; |
109 |
> |
vtmp[1] = ldir[1] - np->rp->rdir[1]; |
110 |
> |
vtmp[2] = ldir[2] - np->rp->rdir[2]; |
111 |
> |
d2 = DOT(vtmp, np->pnorm); |
112 |
> |
d2 = 2.0 - 2.0*d2/sqrt(DOT(vtmp,vtmp)); |
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/* gaussian */ |
114 |
< |
dtmp = exp((DOT(np->vrefl,ldir)-1.)/dtmp)/(2.*PI)/dtmp; |
114 |
> |
dtmp = exp(-d2/dtmp)/(4.*PI*dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->scolor); |
118 |
< |
dtmp *= omega / np->pdot; |
118 |
> |
dtmp *= omega * sqrt(ldot/np->pdot); |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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* is always modified by material color. |
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*/ |
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/* roughness + source */ |
138 |
< |
dtmp = np->alpha2/2.0 + omega/(2.0*PI); |
138 |
> |
dtmp = np->alpha2 + omega/PI; |
139 |
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/* gaussian */ |
140 |
< |
dtmp = exp((DOT(np->prdir,ldir)-1.)/dtmp)/(2.*PI)/dtmp; |
140 |
> |
dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(4.*PI*dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->mcolor); |
144 |
< |
dtmp *= np->tspec * omega / np->pdot; |
144 |
> |
dtmp *= np->tspec * omega * sqrt(-ldot/np->pdot); |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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if (m->oargs.nfargs != (m->otype == MAT_TRANS ? 7 : 5)) |
166 |
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objerror(m, USER, "bad number of arguments"); |
167 |
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nd.mp = m; |
168 |
+ |
nd.rp = r; |
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/* get material color */ |
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setcolor(nd.mcolor, m->oargs.farg[0], |
171 |
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m->oargs.farg[1], |
200 |
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colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp; |
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nd.rspec += (1.0-nd.rspec)*dtmp; |
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/* check threshold */ |
203 |
< |
if (specthresh > FTINY && |
204 |
< |
((specthresh >= 1.-FTINY || |
205 |
< |
specthresh + (.05 - .1*frandom()) > nd.rspec))) |
203 |
> |
if (!(nd.specfl & SP_PURE) && |
204 |
> |
specthresh > FTINY && |
205 |
> |
(specthresh >= 1.-FTINY || |
206 |
> |
specthresh + .05 - .1*frandom() > nd.rspec)) |
207 |
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nd.specfl |= SP_RBLT; |
208 |
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/* compute reflected ray */ |
209 |
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for (i = 0; i < 3; i++) |
230 |
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if (nd.tspec > FTINY) { |
231 |
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nd.specfl |= SP_TRAN; |
232 |
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/* check threshold */ |
233 |
< |
if (specthresh > FTINY && |
234 |
< |
((specthresh >= 1.-FTINY || |
235 |
< |
specthresh + |
227 |
< |
(.05 - .1*frandom()) > nd.tspec))) |
233 |
> |
if (!(nd.specfl & SP_PURE) && specthresh > FTINY && |
234 |
> |
(specthresh >= 1.-FTINY || |
235 |
> |
specthresh + .05 - .1*frandom() > nd.tspec)) |
236 |
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nd.specfl |= SP_TBLT; |
237 |
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if (r->crtype & SHADOW || |
238 |
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DOT(r->pert,r->pert) <= FTINY*FTINY) { |
240 |
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transtest = 2; |
241 |
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} else { |
242 |
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for (i = 0; i < 3; i++) /* perturb */ |
243 |
< |
nd.prdir[i] = r->rdir[i] - |
236 |
< |
0.5*r->pert[i]; |
243 |
> |
nd.prdir[i] = r->rdir[i] - r->pert[i]; |
244 |
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if (DOT(nd.prdir, r->ron) < -FTINY) |
245 |
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normalize(nd.prdir); /* OK */ |
246 |
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else |
261 |
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transtest *= bright(lr.rcol); |
262 |
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transdist = r->rot + lr.rt; |
263 |
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} |
264 |
< |
} |
264 |
> |
} else |
265 |
> |
transtest = 0; |
266 |
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|
267 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
268 |
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return; |
272 |
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if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
273 |
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return; /* 100% pure specular */ |
274 |
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|
275 |
< |
if (r->ro->otype == OBJ_FACE || r->ro->otype == OBJ_RING) |
275 |
> |
if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
276 |
> |
r->ro->otype == OBJ_RING)) |
277 |
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nd.specfl |= SP_FLAT; |
278 |
|
|
279 |
|
if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & SP_PURE)) |
317 |
|
double rv[2]; |
318 |
|
double d, sinp, cosp; |
319 |
|
register int i; |
320 |
+ |
/* quick test */ |
321 |
+ |
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
322 |
+ |
(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
323 |
+ |
return; |
324 |
|
/* set up sample coordinates */ |
325 |
|
v[0] = v[1] = v[2] = 0.0; |
326 |
|
for (i = 0; i < 3; i++) |
369 |
|
if (rv[1] <= FTINY) |
370 |
|
d = 1.0; |
371 |
|
else |
372 |
< |
d = sqrt( np->alpha2/4.0 * -log(rv[1]) ); |
372 |
> |
d = sqrt( -log(rv[1]) * np->alpha2 ); |
373 |
|
for (i = 0; i < 3; i++) |
374 |
|
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
375 |
|
if (DOT(sr.rdir, r->ron) < -FTINY) |
377 |
|
else |
378 |
|
VCOPY(sr.rdir, np->prdir); /* else no jitter */ |
379 |
|
rayvalue(&sr); |
380 |
< |
multcolor(sr.rcol, np->scolor); |
380 |
> |
scalecolor(sr.rcol, np->tspec); |
381 |
> |
multcolor(sr.rcol, np->mcolor); /* modified by color */ |
382 |
|
addcolor(r->rcol, sr.rcol); |
383 |
|
ndims--; |
384 |
|
} |