| 14 |
|
|
| 15 |
|
#include "otypes.h" |
| 16 |
|
|
| 17 |
+ |
#include "func.h" |
| 18 |
+ |
|
| 19 |
|
/* |
| 20 |
|
* Arguments to this material include the color and specularity. |
| 21 |
|
* String arguments include the reflection function and files. |
| 22 |
|
* The BRDF is currently used just for the specular component to light |
| 23 |
|
* sources. Reflectance values or data coordinates are functions |
| 24 |
< |
* of the direction to the light source. |
| 24 |
> |
* of the direction to the light source. (Data modification functions |
| 25 |
> |
* are passed the source direction as args 2-4.) |
| 26 |
|
* We orient the surface towards the incoming ray, so a single |
| 27 |
|
* surface can be used to represent an infinitely thin object. |
| 28 |
|
* |
| 52 |
|
* rbrtd gbrtd bbrtd |
| 53 |
|
* funcfile transform |
| 54 |
|
* 0 |
| 55 |
< |
* 6+ red grn blu rspec trans tspec A7 .. |
| 55 |
> |
* 9+ rdf gdf bdf |
| 56 |
> |
* rdb gdb bdb |
| 57 |
> |
* rdt gdt bdt A10 .. |
| 58 |
|
* |
| 59 |
|
* In addition to the normal variables available to functions, |
| 60 |
|
* we define the following: |
| 61 |
|
* NxP, NyP, NzP - perturbed surface normal |
| 62 |
|
* RdotP - perturbed ray dot product |
| 63 |
< |
* CrP, CgP, CbP - perturbed material color |
| 63 |
> |
* CrP, CgP, CbP - perturbed material color (or pattern) |
| 64 |
|
*/ |
| 65 |
|
|
| 61 |
– |
extern double funvalue(), varvalue(); |
| 62 |
– |
extern XF funcxf; |
| 63 |
– |
|
| 66 |
|
typedef struct { |
| 67 |
|
OBJREC *mp; /* material pointer */ |
| 68 |
|
RAY *pr; /* intersected ray */ |
| 69 |
|
DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
| 70 |
< |
COLOR mcolor; /* color of this material */ |
| 71 |
< |
double rspec; /* specular reflection */ |
| 72 |
< |
double rdiff; /* diffuse reflection */ |
| 73 |
< |
double trans; /* transmissivity */ |
| 74 |
< |
double tspec; /* specular transmission */ |
| 75 |
< |
double tdiff; /* diffuse transmission */ |
| 70 |
> |
COLOR mcolor; /* material (or pattern) color */ |
| 71 |
> |
COLOR rdiff; /* diffuse reflection */ |
| 72 |
> |
COLOR tdiff; /* diffuse transmission */ |
| 73 |
> |
double rspec; /* specular reflectance (1 for BRDTF) */ |
| 74 |
> |
double trans; /* transmissivity (.5 for BRDTF) */ |
| 75 |
> |
double tspec; /* specular transmittance (1 for BRDTF) */ |
| 76 |
|
FVECT pnorm; /* perturbed surface normal */ |
| 77 |
|
double pdot; /* perturbed dot product */ |
| 78 |
|
} BRDFDAT; /* BRDF material data */ |
| 88 |
|
double dtmp; |
| 89 |
|
COLOR ctmp; |
| 90 |
|
FVECT ldx; |
| 91 |
< |
double pt[MAXDIM]; |
| 91 |
> |
double lddx[3], pt[MAXDIM]; |
| 92 |
> |
double vldx[4]; |
| 93 |
|
register char **sa; |
| 94 |
|
register int i; |
| 95 |
|
|
| 99 |
|
|
| 100 |
|
if (ldot <= FTINY && ldot >= -FTINY) |
| 101 |
|
return; /* too close to grazing */ |
| 102 |
+ |
|
| 103 |
|
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
| 104 |
|
return; /* wrong side */ |
| 105 |
|
|
| 106 |
< |
if (ldot > 0.0 && np->rdiff > FTINY) { |
| 106 |
> |
if (ldot > 0.0) { |
| 107 |
|
/* |
| 108 |
|
* Compute and add diffuse reflected component to returned |
| 109 |
|
* color. The diffuse reflected component will always be |
| 110 |
|
* modified by the color of the material. |
| 111 |
|
*/ |
| 112 |
< |
copycolor(ctmp, np->mcolor); |
| 113 |
< |
dtmp = ldot * omega * np->rdiff / PI; |
| 112 |
> |
copycolor(ctmp, np->rdiff); |
| 113 |
> |
dtmp = ldot * omega / PI; |
| 114 |
|
scalecolor(ctmp, dtmp); |
| 115 |
|
addcolor(cval, ctmp); |
| 116 |
< |
} |
| 113 |
< |
if (ldot < 0.0 && np->tdiff > FTINY) { |
| 116 |
> |
} else { |
| 117 |
|
/* |
| 118 |
|
* Diffuse transmitted component. |
| 119 |
|
*/ |
| 120 |
< |
copycolor(ctmp, np->mcolor); |
| 121 |
< |
dtmp = -ldot * omega * np->tdiff / PI; |
| 120 |
> |
copycolor(ctmp, np->tdiff); |
| 121 |
> |
dtmp = -ldot * omega / PI; |
| 122 |
|
scalecolor(ctmp, dtmp); |
| 123 |
|
addcolor(cval, ctmp); |
| 124 |
|
} |
| 125 |
|
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
| 126 |
|
return; /* no specular component */ |
| 127 |
|
/* set up function */ |
| 128 |
< |
setfunc(np->mp, np->pr); |
| 128 |
> |
setbrdfunc(np); |
| 129 |
|
sa = np->mp->oargs.sarg; |
| 130 |
|
errno = 0; |
| 131 |
|
/* transform light vector */ |
| 132 |
|
multv3(ldx, ldir, funcxf.xfm); |
| 133 |
|
for (i = 0; i < 3; i++) |
| 134 |
< |
ldx[i] /= funcxf.sca; |
| 134 |
> |
lddx[i] = ldx[i]/funcxf.sca; |
| 135 |
|
/* compute BRTDF */ |
| 136 |
|
if (np->mp->otype == MAT_BRTDF) { |
| 137 |
< |
colval(ctmp,RED) = funvalue(sa[6], 3, ldx); |
| 137 |
> |
if (sa[6][0] == '0') /* special case */ |
| 138 |
> |
colval(ctmp,RED) = 0.0; |
| 139 |
> |
else |
| 140 |
> |
colval(ctmp,RED) = funvalue(sa[6], 3, lddx); |
| 141 |
|
if (!strcmp(sa[7],sa[6])) |
| 142 |
|
colval(ctmp,GRN) = colval(ctmp,RED); |
| 143 |
|
else |
| 144 |
< |
colval(ctmp,GRN) = funvalue(sa[7], 3, ldx); |
| 144 |
> |
colval(ctmp,GRN) = funvalue(sa[7], 3, lddx); |
| 145 |
|
if (!strcmp(sa[8],sa[6])) |
| 146 |
|
colval(ctmp,BLU) = colval(ctmp,RED); |
| 147 |
|
else if (!strcmp(sa[8],sa[7])) |
| 148 |
|
colval(ctmp,BLU) = colval(ctmp,GRN); |
| 149 |
|
else |
| 150 |
< |
colval(ctmp,BLU) = funvalue(sa[8], 3, ldx); |
| 150 |
> |
colval(ctmp,BLU) = funvalue(sa[8], 3, lddx); |
| 151 |
|
dtmp = bright(ctmp); |
| 152 |
|
} else if (np->dp == NULL) { |
| 153 |
< |
dtmp = funvalue(sa[0], 3, ldx); |
| 153 |
> |
dtmp = funvalue(sa[0], 3, lddx); |
| 154 |
|
setcolor(ctmp, dtmp, dtmp, dtmp); |
| 155 |
|
} else { |
| 156 |
|
for (i = 0; i < np->dp->nd; i++) |
| 157 |
< |
pt[i] = funvalue(sa[3+i], 3, ldx); |
| 158 |
< |
dtmp = datavalue(np->dp, pt); |
| 159 |
< |
dtmp = funvalue(sa[0], 1, &dtmp); |
| 157 |
> |
pt[i] = funvalue(sa[3+i], 3, lddx); |
| 158 |
> |
vldx[0] = datavalue(np->dp, pt); |
| 159 |
> |
vldx[1] = lddx[0]; vldx[2] = lddx[1]; vldx[3] = lddx[2]; |
| 160 |
> |
dtmp = funvalue(sa[0], 4, vldx); |
| 161 |
|
setcolor(ctmp, dtmp, dtmp, dtmp); |
| 162 |
|
} |
| 163 |
< |
if (errno) |
| 164 |
< |
goto computerr; |
| 163 |
> |
if (errno) { |
| 164 |
> |
objerror(np->mp, WARNING, "compute error"); |
| 165 |
> |
return; |
| 166 |
> |
} |
| 167 |
|
if (dtmp <= FTINY) |
| 168 |
|
return; |
| 169 |
|
if (ldot > 0.0) { |
| 170 |
|
/* |
| 171 |
|
* Compute reflected non-diffuse component. |
| 172 |
|
*/ |
| 173 |
< |
if (np->mp->otype == MAT_MFUNC || np->mp->otype == MAT_MDATA) |
| 173 |
> |
if (np->mp->otype == MAT_MFUNC | np->mp->otype == MAT_MDATA) |
| 174 |
|
multcolor(ctmp, np->mcolor); |
| 175 |
|
dtmp = ldot * omega * np->rspec; |
| 176 |
|
scalecolor(ctmp, dtmp); |
| 179 |
|
/* |
| 180 |
|
* Compute transmitted non-diffuse component. |
| 181 |
|
*/ |
| 182 |
< |
if (np->mp->otype == MAT_TFUNC || np->mp->otype == MAT_TDATA) |
| 182 |
> |
if (np->mp->otype == MAT_TFUNC | np->mp->otype == MAT_TDATA) |
| 183 |
|
multcolor(ctmp, np->mcolor); |
| 184 |
|
dtmp = -ldot * omega * np->tspec; |
| 185 |
|
scalecolor(ctmp, dtmp); |
| 186 |
|
addcolor(cval, ctmp); |
| 187 |
|
} |
| 179 |
– |
return; |
| 180 |
– |
computerr: |
| 181 |
– |
objerror(np->mp, WARNING, "compute error"); |
| 182 |
– |
return; |
| 188 |
|
} |
| 189 |
|
|
| 190 |
|
|
| 191 |
< |
m_brdf(m, r) /* color a ray which hit a BRDF material */ |
| 191 |
> |
m_brdf(m, r) /* color a ray which hit a BRDTF material */ |
| 192 |
|
register OBJREC *m; |
| 193 |
|
register RAY *r; |
| 194 |
|
{ |
| 190 |
– |
int minsa, minfa; |
| 195 |
|
BRDFDAT nd; |
| 196 |
+ |
RAY sr; |
| 197 |
|
double transtest, transdist; |
| 198 |
+ |
int hasrefl, hastrans; |
| 199 |
|
COLOR ctmp; |
| 200 |
|
double dtmp; |
| 201 |
< |
FVECT vec; |
| 201 |
> |
register MFUNC *mf; |
| 202 |
|
register int i; |
| 203 |
|
/* check arguments */ |
| 204 |
< |
switch (m->otype) { |
| 205 |
< |
case MAT_PFUNC: case MAT_MFUNC: |
| 206 |
< |
minsa = 2; minfa = 4; break; |
| 207 |
< |
case MAT_PDATA: case MAT_MDATA: |
| 208 |
< |
minsa = 4; minfa = 4; break; |
| 209 |
< |
case MAT_TFUNC: |
| 210 |
< |
minsa = 2; minfa = 6; break; |
| 211 |
< |
case MAT_TDATA: |
| 212 |
< |
minsa = 4; minfa = 6; break; |
| 213 |
< |
case MAT_BRTDF: |
| 214 |
< |
minsa = 10; minfa = 6; break; |
| 204 |
> |
if (m->oargs.nsargs < 10 | m->oargs.nfargs < 9) |
| 205 |
> |
objerror(m, USER, "bad # arguments"); |
| 206 |
> |
nd.mp = m; |
| 207 |
> |
nd.pr = r; |
| 208 |
> |
/* dummy values */ |
| 209 |
> |
nd.rspec = nd.tspec = 1.0; |
| 210 |
> |
nd.trans = 0.5; |
| 211 |
> |
/* diffuse reflectance */ |
| 212 |
> |
if (r->rod > 0.0) |
| 213 |
> |
setcolor(nd.rdiff, m->oargs.farg[0], |
| 214 |
> |
m->oargs.farg[1], |
| 215 |
> |
m->oargs.farg[2]); |
| 216 |
> |
else |
| 217 |
> |
setcolor(nd.rdiff, m->oargs.farg[3], |
| 218 |
> |
m->oargs.farg[4], |
| 219 |
> |
m->oargs.farg[5]); |
| 220 |
> |
/* diffuse transmittance */ |
| 221 |
> |
setcolor(nd.tdiff, m->oargs.farg[6], |
| 222 |
> |
m->oargs.farg[7], |
| 223 |
> |
m->oargs.farg[8]); |
| 224 |
> |
/* get modifiers */ |
| 225 |
> |
raytexture(r, m->omod); |
| 226 |
> |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 227 |
> |
if (r->rod < 0.0) { /* orient perturbed values */ |
| 228 |
> |
nd.pdot = -nd.pdot; |
| 229 |
> |
for (i = 0; i < 3; i++) { |
| 230 |
> |
nd.pnorm[i] = -nd.pnorm[i]; |
| 231 |
> |
r->pert[i] = -r->pert[i]; |
| 232 |
> |
} |
| 233 |
|
} |
| 234 |
< |
if (m->oargs.nsargs < minsa || m->oargs.nfargs < minfa) |
| 234 |
> |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
| 235 |
> |
multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
| 236 |
> |
multcolor(nd.tdiff, nd.mcolor); |
| 237 |
> |
hasrefl = bright(nd.rdiff) > FTINY; |
| 238 |
> |
hastrans = bright(nd.tdiff) > FTINY; |
| 239 |
> |
/* load cal file */ |
| 240 |
> |
nd.dp = NULL; |
| 241 |
> |
mf = getfunc(m, 9, 0x3f, 0); |
| 242 |
> |
/* compute transmitted ray */ |
| 243 |
> |
setbrdfunc(&nd); |
| 244 |
> |
transtest = 0; |
| 245 |
> |
transdist = r->rot; |
| 246 |
> |
errno = 0; |
| 247 |
> |
setcolor(ctmp, evalue(mf->ep[3]), |
| 248 |
> |
evalue(mf->ep[4]), |
| 249 |
> |
evalue(mf->ep[5])); |
| 250 |
> |
if (errno) |
| 251 |
> |
objerror(m, WARNING, "compute error"); |
| 252 |
> |
else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
| 253 |
> |
if (!(r->crtype & SHADOW) && |
| 254 |
> |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 255 |
> |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 256 |
> |
sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
| 257 |
> |
if (normalize(sr.rdir) == 0.0) { |
| 258 |
> |
objerror(m, WARNING, "illegal perturbation"); |
| 259 |
> |
VCOPY(sr.rdir, r->rdir); |
| 260 |
> |
} |
| 261 |
> |
} else { |
| 262 |
> |
VCOPY(sr.rdir, r->rdir); |
| 263 |
> |
transtest = 2; |
| 264 |
> |
} |
| 265 |
> |
rayvalue(&sr); |
| 266 |
> |
multcolor(sr.rcol, ctmp); |
| 267 |
> |
addcolor(r->rcol, sr.rcol); |
| 268 |
> |
transtest *= bright(sr.rcol); |
| 269 |
> |
transdist = r->rot + sr.rt; |
| 270 |
> |
} |
| 271 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 272 |
> |
return; |
| 273 |
> |
/* compute reflected ray */ |
| 274 |
> |
setbrdfunc(&nd); |
| 275 |
> |
errno = 0; |
| 276 |
> |
setcolor(ctmp, evalue(mf->ep[0]), |
| 277 |
> |
evalue(mf->ep[1]), |
| 278 |
> |
evalue(mf->ep[2])); |
| 279 |
> |
if (errno) |
| 280 |
> |
objerror(m, WARNING, "compute error"); |
| 281 |
> |
else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
| 282 |
> |
for (i = 0; i < 3; i++) |
| 283 |
> |
sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
| 284 |
> |
rayvalue(&sr); |
| 285 |
> |
multcolor(sr.rcol, ctmp); |
| 286 |
> |
addcolor(r->rcol, sr.rcol); |
| 287 |
> |
} |
| 288 |
> |
/* compute ambient */ |
| 289 |
> |
if (hasrefl) { |
| 290 |
> |
if (nd.pdot < 0.0) |
| 291 |
> |
flipsurface(r); |
| 292 |
> |
ambient(ctmp, r); |
| 293 |
> |
multcolor(ctmp, nd.rdiff); |
| 294 |
> |
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 295 |
> |
if (nd.pdot < 0.0) |
| 296 |
> |
flipsurface(r); |
| 297 |
> |
} |
| 298 |
> |
if (hastrans) { /* from other side */ |
| 299 |
> |
if (nd.pdot > 0.0) |
| 300 |
> |
flipsurface(r); |
| 301 |
> |
ambient(ctmp, r); |
| 302 |
> |
multcolor(ctmp, nd.tdiff); |
| 303 |
> |
addcolor(r->rcol, ctmp); |
| 304 |
> |
if (nd.pdot > 0.0) |
| 305 |
> |
flipsurface(r); |
| 306 |
> |
} |
| 307 |
> |
if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
| 308 |
> |
direct(r, dirbrdf, &nd); /* add direct component */ |
| 309 |
> |
/* check distance */ |
| 310 |
> |
if (transtest > bright(r->rcol)) |
| 311 |
> |
r->rt = transdist; |
| 312 |
> |
} |
| 313 |
> |
|
| 314 |
> |
|
| 315 |
> |
|
| 316 |
> |
m_brdf2(m, r) /* color a ray which hit a BRDF material */ |
| 317 |
> |
register OBJREC *m; |
| 318 |
> |
register RAY *r; |
| 319 |
> |
{ |
| 320 |
> |
BRDFDAT nd; |
| 321 |
> |
COLOR ctmp; |
| 322 |
> |
double dtmp; |
| 323 |
> |
/* always a shadow */ |
| 324 |
> |
if (r->crtype & SHADOW) |
| 325 |
> |
return; |
| 326 |
> |
/* check arguments */ |
| 327 |
> |
if (m->oargs.nsargs < (hasdata(m->otype)?4:2) | m->oargs.nfargs < |
| 328 |
> |
(m->otype==MAT_TFUNC|m->otype==MAT_TDATA?6:4)) |
| 329 |
|
objerror(m, USER, "bad # arguments"); |
| 330 |
|
nd.mp = m; |
| 331 |
|
nd.pr = r; |
| 332 |
+ |
/* get material color */ |
| 333 |
+ |
setcolor(nd.mcolor, m->oargs.farg[0], |
| 334 |
+ |
m->oargs.farg[1], |
| 335 |
+ |
m->oargs.farg[2]); |
| 336 |
|
/* get specular component */ |
| 337 |
|
nd.rspec = m->oargs.farg[3]; |
| 338 |
< |
/* compute transmission */ |
| 339 |
< |
if (m->otype == MAT_TFUNC || m->otype == MAT_TDATA |
| 218 |
< |
|| m->otype == MAT_BRTDF) { |
| 338 |
> |
/* compute transmittance */ |
| 339 |
> |
if (m->otype == MAT_TFUNC | m->otype == MAT_TDATA) { |
| 340 |
|
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
| 341 |
|
nd.tspec = nd.trans * m->oargs.farg[5]; |
| 342 |
< |
nd.tdiff = nd.trans - nd.tspec; |
| 343 |
< |
} else |
| 344 |
< |
nd.tdiff = nd.tspec = nd.trans = 0.0; |
| 345 |
< |
/* early shadow check */ |
| 346 |
< |
if (r->crtype & SHADOW && (m->otype != MAT_BRTDF || nd.tspec <= FTINY)) |
| 347 |
< |
return; |
| 348 |
< |
/* diffuse reflection */ |
| 349 |
< |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
| 350 |
< |
/* get material color */ |
| 230 |
< |
setcolor(nd.mcolor, m->oargs.farg[0], |
| 231 |
< |
m->oargs.farg[1], |
| 232 |
< |
m->oargs.farg[2]); |
| 342 |
> |
dtmp = nd.trans - nd.tspec; |
| 343 |
> |
setcolor(nd.tdiff, dtmp, dtmp, dtmp); |
| 344 |
> |
} else { |
| 345 |
> |
nd.tspec = nd.trans = 0.0; |
| 346 |
> |
setcolor(nd.tdiff, 0.0, 0.0, 0.0); |
| 347 |
> |
} |
| 348 |
> |
/* compute reflectance */ |
| 349 |
> |
dtmp = 1.0 - nd.trans - nd.rspec; |
| 350 |
> |
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
| 351 |
|
/* fix orientation */ |
| 352 |
|
if (r->rod < 0.0) |
| 353 |
|
flipsurface(r); |
| 355 |
|
raytexture(r, m->omod); |
| 356 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 357 |
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 358 |
< |
r->rt = r->rot; /* default ray length */ |
| 359 |
< |
transtest = 0; |
| 358 |
> |
multcolor(nd.rdiff, nd.mcolor); |
| 359 |
> |
multcolor(nd.tdiff, nd.mcolor); |
| 360 |
|
/* load auxiliary files */ |
| 361 |
< |
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA |
| 244 |
< |
|| m->otype == MAT_TDATA) { |
| 361 |
> |
if (hasdata(m->otype)) { |
| 362 |
|
nd.dp = getdata(m->oargs.sarg[1]); |
| 363 |
< |
for (i = 3; i < m->oargs.nsargs; i++) |
| 247 |
< |
if (m->oargs.sarg[i][0] == '-') |
| 248 |
< |
break; |
| 249 |
< |
if (i-3 != nd.dp->nd) |
| 250 |
< |
objerror(m, USER, "dimension error"); |
| 251 |
< |
if (!fundefined(m->oargs.sarg[3])) |
| 252 |
< |
loadfunc(m->oargs.sarg[2]); |
| 253 |
< |
} else if (m->otype == MAT_BRTDF) { |
| 254 |
< |
nd.dp = NULL; |
| 255 |
< |
if (!fundefined(m->oargs.sarg[7])) |
| 256 |
< |
loadfunc(m->oargs.sarg[9]); |
| 363 |
> |
getfunc(m, 2, 0, 0); |
| 364 |
|
} else { |
| 365 |
|
nd.dp = NULL; |
| 366 |
< |
if (!fundefined(m->oargs.sarg[0])) |
| 260 |
< |
loadfunc(m->oargs.sarg[1]); |
| 366 |
> |
getfunc(m, 1, 0, 0); |
| 367 |
|
} |
| 262 |
– |
/* set special variables */ |
| 263 |
– |
setfunc(m, r); |
| 264 |
– |
multv3(vec, nd.pnorm, funcxf.xfm); |
| 265 |
– |
varset("NxP", '=', vec[0]/funcxf.sca); |
| 266 |
– |
varset("NyP", '=', vec[1]/funcxf.sca); |
| 267 |
– |
varset("NzP", '=', vec[2]/funcxf.sca); |
| 268 |
– |
varset("RdotP", '=', nd.pdot); |
| 269 |
– |
varset("CrP", '=', colval(nd.mcolor,RED)); |
| 270 |
– |
varset("CgP", '=', colval(nd.mcolor,GRN)); |
| 271 |
– |
varset("CbP", '=', colval(nd.mcolor,BLU)); |
| 272 |
– |
/* compute transmitted ray */ |
| 273 |
– |
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
| 274 |
– |
RAY sr; |
| 275 |
– |
errno = 0; |
| 276 |
– |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
| 277 |
– |
varvalue(m->oargs.sarg[1]), |
| 278 |
– |
varvalue(m->oargs.sarg[2])); |
| 279 |
– |
scalecolor(ctmp, nd.tspec); |
| 280 |
– |
if (errno) |
| 281 |
– |
objerror(m, WARNING, "compute error"); |
| 282 |
– |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 283 |
– |
rayorigin(&sr, r, TRANS, dtmp) == 0) { |
| 284 |
– |
if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 285 |
– |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 286 |
– |
sr.rdir[i] = r->rdir[i] - |
| 287 |
– |
.75*r->pert[i]; |
| 288 |
– |
normalize(sr.rdir); |
| 289 |
– |
} else { |
| 290 |
– |
VCOPY(sr.rdir, r->rdir); |
| 291 |
– |
transtest = 2; |
| 292 |
– |
} |
| 293 |
– |
rayvalue(&sr); |
| 294 |
– |
multcolor(sr.rcol, ctmp); |
| 295 |
– |
addcolor(r->rcol, sr.rcol); |
| 296 |
– |
transtest *= bright(sr.rcol); |
| 297 |
– |
transdist = r->rot + sr.rt; |
| 298 |
– |
} |
| 299 |
– |
} |
| 300 |
– |
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 301 |
– |
return; |
| 302 |
– |
/* compute reflected ray */ |
| 303 |
– |
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
| 304 |
– |
RAY sr; |
| 305 |
– |
errno = 0; |
| 306 |
– |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
| 307 |
– |
varvalue(m->oargs.sarg[4]), |
| 308 |
– |
varvalue(m->oargs.sarg[5])); |
| 309 |
– |
scalecolor(ctmp, nd.rspec); |
| 310 |
– |
if (errno) |
| 311 |
– |
objerror(m, WARNING, "compute error"); |
| 312 |
– |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 313 |
– |
rayorigin(&sr, r, REFLECTED, dtmp) == 0) { |
| 314 |
– |
for (i = 0; i < 3; i++) |
| 315 |
– |
sr.rdir[i] = r->rdir[i] + |
| 316 |
– |
2.0*nd.pdot*nd.pnorm[i]; |
| 317 |
– |
rayvalue(&sr); |
| 318 |
– |
multcolor(sr.rcol, ctmp); |
| 319 |
– |
addcolor(r->rcol, sr.rcol); |
| 320 |
– |
} |
| 321 |
– |
} |
| 368 |
|
/* compute ambient */ |
| 369 |
< |
if (nd.rdiff > FTINY) { |
| 369 |
> |
if (nd.trans < 1.0-FTINY) { |
| 370 |
|
ambient(ctmp, r); |
| 371 |
< |
if (m->otype == MAT_BRTDF) |
| 326 |
< |
scalecolor(ctmp, nd.rdiff); |
| 327 |
< |
else |
| 328 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
| 371 |
> |
scalecolor(ctmp, 1.0-nd.trans); |
| 372 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 373 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 374 |
|
} |
| 375 |
< |
if (nd.tdiff > FTINY) { /* from other side */ |
| 375 |
> |
if (nd.trans > FTINY) { /* from other side */ |
| 376 |
|
flipsurface(r); |
| 377 |
|
ambient(ctmp, r); |
| 378 |
< |
if (m->otype == MAT_BRTDF) |
| 336 |
< |
scalecolor(ctmp, nd.tdiff); |
| 337 |
< |
else |
| 338 |
< |
scalecolor(ctmp, nd.trans); |
| 378 |
> |
scalecolor(ctmp, nd.trans); |
| 379 |
|
multcolor(ctmp, nd.mcolor); |
| 380 |
|
addcolor(r->rcol, ctmp); |
| 381 |
|
flipsurface(r); |
| 382 |
|
} |
| 383 |
|
/* add direct component */ |
| 384 |
|
direct(r, dirbrdf, &nd); |
| 385 |
< |
/* check distance */ |
| 386 |
< |
if (transtest > bright(r->rcol)) |
| 387 |
< |
r->rt = transdist; |
| 385 |
> |
} |
| 386 |
> |
|
| 387 |
> |
|
| 388 |
> |
setbrdfunc(np) /* set up brdf function and variables */ |
| 389 |
> |
register BRDFDAT *np; |
| 390 |
> |
{ |
| 391 |
> |
FVECT vec; |
| 392 |
> |
|
| 393 |
> |
if (setfunc(np->mp, np->pr) == 0) |
| 394 |
> |
return(0); /* it's OK, setfunc says we're done */ |
| 395 |
> |
/* else (re)assign special variables */ |
| 396 |
> |
multv3(vec, np->pnorm, funcxf.xfm); |
| 397 |
> |
varset("NxP", '=', vec[0]/funcxf.sca); |
| 398 |
> |
varset("NyP", '=', vec[1]/funcxf.sca); |
| 399 |
> |
varset("NzP", '=', vec[2]/funcxf.sca); |
| 400 |
> |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
| 401 |
> |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
| 402 |
> |
varset("CrP", '=', colval(np->mcolor,RED)); |
| 403 |
> |
varset("CgP", '=', colval(np->mcolor,GRN)); |
| 404 |
> |
varset("CbP", '=', colval(np->mcolor,BLU)); |
| 405 |
> |
return(1); |
| 406 |
|
} |
