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extern double specthresh; /* specular sampling threshold */ |
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extern double specjitter; /* specular sampling jitter */ |
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26 |
+ |
extern int backvis; /* back faces visible? */ |
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|
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static gaussamp(); |
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/* |
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* red grn blu rspec rough trans tspec |
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*/ |
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|
41 |
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#define BSPEC(m) (6.0) /* specularity parameter b */ |
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|
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/* specularity flags */ |
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#define SP_REFL 01 /* has reflected specular component */ |
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#define SP_TRAN 02 /* has transmitted specular */ |
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{ |
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NORMDAT nd; |
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double transtest, transdist; |
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double dtmp; |
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COLOR ctmp; |
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register int i; |
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/* easy shadow test */ |
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if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
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< |
return; |
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> |
return(1); |
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|
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if (m->oargs.nfargs != (m->otype == MAT_TRANS ? 7 : 5)) |
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objerror(m, USER, "bad number of arguments"); |
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nd.alpha2 = m->oargs.farg[4]; |
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if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
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nd.specfl |= SP_PURE; |
178 |
< |
/* reorient if necessary */ |
179 |
< |
if (r->rod < 0.0) |
180 |
< |
flipsurface(r); |
178 |
> |
/* check for back side */ |
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> |
if (r->rod < 0.0) { |
180 |
> |
if (!backvis && m->otype != MAT_TRANS) { |
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> |
raytrans(r); |
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> |
return(1); |
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> |
} |
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> |
flipsurface(r); /* reorient if backvis */ |
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> |
} |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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nd.pdot = .001; /* non-zero for dirnorm() */ |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
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transtest = 0; |
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+ |
transdist = r->rot; |
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/* get specular component */ |
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if ((nd.rspec = m->oargs.farg[3]) > FTINY) { |
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nd.specfl |= SP_REFL; |
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else |
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setcolor(nd.scolor, 1.0, 1.0, 1.0); |
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scalecolor(nd.scolor, nd.rspec); |
198 |
– |
/* improved model */ |
199 |
– |
dtmp = exp(-BSPEC(m)*nd.pdot); |
200 |
– |
for (i = 0; i < 3; i++) |
201 |
– |
colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp; |
202 |
– |
nd.rspec += (1.0-nd.rspec)*dtmp; |
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/* check threshold */ |
204 |
< |
if (!(nd.specfl & SP_PURE) && |
205 |
< |
specthresh > FTINY && |
206 |
< |
(specthresh >= 1.-FTINY || |
207 |
< |
specthresh + .05 - .1*frandom() > nd.rspec)) |
204 |
> |
if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
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nd.specfl |= SP_RBLT; |
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/* compute reflected ray */ |
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for (i = 0; i < 3; i++) |
228 |
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if (nd.tspec > FTINY) { |
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nd.specfl |= SP_TRAN; |
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/* check threshold */ |
231 |
< |
if (!(nd.specfl & SP_PURE) && specthresh > FTINY && |
232 |
< |
(specthresh >= 1.-FTINY || |
236 |
< |
specthresh + .05 - .1*frandom() > nd.tspec)) |
231 |
> |
if (!(nd.specfl & SP_PURE) && |
232 |
> |
specthresh >= nd.tspec-FTINY) |
233 |
|
nd.specfl |= SP_TBLT; |
234 |
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if (r->crtype & SHADOW || |
235 |
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DOT(r->pert,r->pert) <= FTINY*FTINY) { |
262 |
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transtest = 0; |
263 |
|
|
264 |
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if (r->crtype & SHADOW) /* the rest is shadow */ |
265 |
< |
return; |
265 |
> |
return(1); |
266 |
|
/* diffuse reflection */ |
267 |
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nd.rdiff = 1.0 - nd.trans - nd.rspec; |
268 |
|
|
269 |
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if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
270 |
< |
return; /* 100% pure specular */ |
270 |
> |
return(1); /* 100% pure specular */ |
271 |
|
|
272 |
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if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
273 |
|
r->ro->otype == OBJ_RING)) |
301 |
|
/* check distance */ |
302 |
|
if (transtest > bright(r->rcol)) |
303 |
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r->rt = transdist; |
304 |
+ |
|
305 |
+ |
return(1); |
306 |
|
} |
307 |
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308 |
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