| 43 |
|
/* specularity flags */ |
| 44 |
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#define SP_REFL 01 /* has reflected specular component */ |
| 45 |
|
#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 */ |
| 50 |
|
|
| 51 |
|
typedef struct { |
| 52 |
|
OBJREC *mp; /* material pointer */ |
| 53 |
+ |
RAY *rp; /* ray pointer */ |
| 54 |
|
short specfl; /* specularity flags, defined above */ |
| 55 |
|
COLOR mcolor; /* color of this material */ |
| 56 |
|
COLOR scolor; /* color of specular component */ |
| 72 |
|
double omega; /* light source size */ |
| 73 |
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{ |
| 74 |
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double ldot; |
| 75 |
< |
double dtmp; |
| 76 |
< |
int i; |
| 75 |
> |
double dtmp, d2; |
| 76 |
> |
FVECT vtmp; |
| 77 |
> |
register int i; |
| 78 |
|
COLOR ctmp; |
| 79 |
|
|
| 80 |
|
setcolor(cval, 0.0, 0.0, 0.0); |
| 101 |
|
* gaussian distribution model. |
| 102 |
|
*/ |
| 103 |
|
/* roughness */ |
| 104 |
< |
dtmp = 2.0*np->alpha2; |
| 104 |
> |
dtmp = np->alpha2; |
| 105 |
|
/* + source if flat */ |
| 106 |
|
if (np->specfl & SP_FLAT) |
| 107 |
< |
dtmp += omega/(2.0*PI); |
| 107 |
> |
dtmp += omega/(4.0*PI); |
| 108 |
> |
/* delta */ |
| 109 |
> |
for (i = 0; i < 3; i++) |
| 110 |
> |
vtmp[i] = ldir[i] - np->rp->rdir[i]; |
| 111 |
> |
d2 = DOT(vtmp, np->pnorm); |
| 112 |
> |
d2 = 2.0 - 2.0*d2/sqrt(DOT(vtmp,vtmp)); |
| 113 |
|
/* gaussian */ |
| 114 |
< |
dtmp = exp((DOT(np->vrefl,ldir)-1.)/dtmp)/(2.*PI)/dtmp; |
| 114 |
> |
dtmp = exp(-d2/dtmp)/(4.*PI*dtmp); |
| 115 |
|
/* worth using? */ |
| 116 |
|
if (dtmp > FTINY) { |
| 117 |
|
copycolor(ctmp, np->scolor); |
| 118 |
< |
dtmp *= omega / np->pdot; |
| 118 |
> |
dtmp *= omega * sqrt(ldot/np->pdot); |
| 119 |
|
scalecolor(ctmp, dtmp); |
| 120 |
|
addcolor(cval, ctmp); |
| 121 |
|
} |
| 141 |
|
/* worth using? */ |
| 142 |
|
if (dtmp > FTINY) { |
| 143 |
|
copycolor(ctmp, np->mcolor); |
| 144 |
< |
dtmp *= np->tspec * omega / np->pdot; |
| 144 |
> |
dtmp *= np->tspec * omega * sqrt(ldot/np->pdot); |
| 145 |
|
scalecolor(ctmp, dtmp); |
| 146 |
|
addcolor(cval, ctmp); |
| 147 |
|
} |
| 165 |
|
if (m->oargs.nfargs != (m->otype == MAT_TRANS ? 7 : 5)) |
| 166 |
|
objerror(m, USER, "bad number of arguments"); |
| 167 |
|
nd.mp = m; |
| 168 |
+ |
nd.rp = r; |
| 169 |
|
/* get material color */ |
| 170 |
|
setcolor(nd.mcolor, m->oargs.farg[0], |
| 171 |
|
m->oargs.farg[1], |
| 200 |
|
colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp; |
| 201 |
|
nd.rspec += (1.0-nd.rspec)*dtmp; |
| 202 |
|
/* check threshold */ |
| 203 |
< |
if (specthresh > FTINY && |
| 204 |
< |
((specthresh >= 1.-FTINY || |
| 205 |
< |
specthresh + (.1 - .2*urand(8199+samplendx)) |
| 206 |
< |
> nd.rspec))) |
| 203 |
> |
if (!(nd.specfl & SP_PURE) && |
| 204 |
> |
specthresh > FTINY && |
| 205 |
> |
(specthresh >= 1.-FTINY || |
| 206 |
> |
specthresh > nd.rspec)) |
| 207 |
|
nd.specfl |= SP_RBLT; |
| 208 |
|
/* compute reflected ray */ |
| 209 |
|
for (i = 0; i < 3; i++) |
| 230 |
|
if (nd.tspec > FTINY) { |
| 231 |
|
nd.specfl |= SP_TRAN; |
| 232 |
|
/* check threshold */ |
| 233 |
< |
if (specthresh > FTINY && |
| 234 |
< |
((specthresh >= 1.-FTINY || |
| 235 |
< |
specthresh + |
| 228 |
< |
(.1 - .2*urand(7241+samplendx)) |
| 229 |
< |
> nd.tspec))) |
| 233 |
> |
if (!(nd.specfl & SP_PURE) && specthresh > FTINY && |
| 234 |
> |
(specthresh >= 1.-FTINY || |
| 235 |
> |
specthresh > nd.tspec)) |
| 236 |
|
nd.specfl |= SP_TBLT; |
| 237 |
|
if (r->crtype & SHADOW || |
| 238 |
|
DOT(r->pert,r->pert) <= FTINY*FTINY) { |
| 262 |
|
transtest *= bright(lr.rcol); |
| 263 |
|
transdist = r->rot + lr.rt; |
| 264 |
|
} |
| 265 |
< |
} |
| 265 |
> |
} else |
| 266 |
> |
transtest = 0; |
| 267 |
|
|
| 268 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 269 |
|
return; |
| 273 |
|
if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
| 274 |
|
return; /* 100% pure specular */ |
| 275 |
|
|
| 276 |
< |
if (r->ro->otype == OBJ_FACE || r->ro->otype == OBJ_RING) |
| 276 |
> |
if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
| 277 |
> |
r->ro->otype == OBJ_RING)) |
| 278 |
|
nd.specfl |= SP_FLAT; |
| 279 |
|
|
| 280 |
|
if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & SP_PURE)) |
| 318 |
|
double rv[2]; |
| 319 |
|
double d, sinp, cosp; |
| 320 |
|
register int i; |
| 321 |
+ |
/* quick test */ |
| 322 |
+ |
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
| 323 |
+ |
(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
| 324 |
+ |
return; |
| 325 |
|
/* set up sample coordinates */ |
| 326 |
|
v[0] = v[1] = v[2] = 0.0; |
| 327 |
|
for (i = 0; i < 3; i++) |
| 378 |
|
else |
| 379 |
|
VCOPY(sr.rdir, np->prdir); /* else no jitter */ |
| 380 |
|
rayvalue(&sr); |
| 381 |
< |
multcolor(sr.rcol, np->scolor); |
| 381 |
> |
scalecolor(sr.rcol, np->tspec); |
| 382 |
> |
multcolor(sr.rcol, np->mcolor); /* modified by color */ |
| 383 |
|
addcolor(r->rcol, sr.rcol); |
| 384 |
|
ndims--; |
| 385 |
|
} |
