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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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#ifndef lint |
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< |
static char SCCSid[] = "$SunId$ LBL"; |
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> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
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|
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/* |
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* Shading for materials with arbitrary BRDF's |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#include "ray.h" |
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|
67 |
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#include "data.h" |
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|
69 |
|
#include "otypes.h" |
70 |
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|
71 |
+ |
#include "func.h" |
72 |
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|
73 |
|
/* |
74 |
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* Arguments to this material include the color and specularity. |
75 |
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* String arguments include the reflection function and files. |
76 |
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* The BRDF is currently used just for the specular component to light |
77 |
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* sources. Reflectance values or data coordinates are functions |
78 |
< |
* of the direction to the light source. |
78 |
> |
* of the direction to the light source. (Data modification functions |
79 |
> |
* are passed the source direction as args 2-4.) |
80 |
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* We orient the surface towards the incoming ray, so a single |
81 |
|
* surface can be used to represent an infinitely thin object. |
82 |
|
* |
106 |
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* rbrtd gbrtd bbrtd |
107 |
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* funcfile transform |
108 |
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* 0 |
109 |
< |
* 6+ red grn blu rspec trans tspec A7 .. |
109 |
> |
* 9+ rdf gdf bdf |
110 |
> |
* rdb gdb bdb |
111 |
> |
* rdt gdt bdt A10 .. |
112 |
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* |
113 |
|
* In addition to the normal variables available to functions, |
114 |
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* we define the following: |
115 |
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* NxP, NyP, NzP - perturbed surface normal |
116 |
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* RdotP - perturbed ray dot product |
117 |
< |
* CrP, CgP, CbP - perturbed material color |
117 |
> |
* CrP, CgP, CbP - perturbed material color (or pattern) |
118 |
|
*/ |
119 |
|
|
61 |
– |
extern double funvalue(), varvalue(); |
62 |
– |
extern XF funcxf; |
63 |
– |
|
120 |
|
typedef struct { |
121 |
|
OBJREC *mp; /* material pointer */ |
122 |
|
RAY *pr; /* intersected ray */ |
123 |
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DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
124 |
< |
COLOR mcolor; /* color of this material */ |
125 |
< |
double rspec; /* specular reflection */ |
126 |
< |
double rdiff; /* diffuse reflection */ |
127 |
< |
double trans; /* transmissivity */ |
128 |
< |
double tspec; /* specular transmission */ |
129 |
< |
double tdiff; /* diffuse transmission */ |
124 |
> |
COLOR mcolor; /* material (or pattern) color */ |
125 |
> |
COLOR rdiff; /* diffuse reflection */ |
126 |
> |
COLOR tdiff; /* diffuse transmission */ |
127 |
> |
double rspec; /* specular reflectance (1 for BRDTF) */ |
128 |
> |
double trans; /* transmissivity (.5 for BRDTF) */ |
129 |
> |
double tspec; /* specular transmittance (1 for BRDTF) */ |
130 |
|
FVECT pnorm; /* perturbed surface normal */ |
131 |
|
double pdot; /* perturbed dot product */ |
132 |
|
} BRDFDAT; /* BRDF material data */ |
133 |
|
|
134 |
|
|
135 |
+ |
static void |
136 |
|
dirbrdf(cval, np, ldir, omega) /* compute source contribution */ |
137 |
|
COLOR cval; /* returned coefficient */ |
138 |
|
register BRDFDAT *np; /* material data */ |
143 |
|
double dtmp; |
144 |
|
COLOR ctmp; |
145 |
|
FVECT ldx; |
146 |
< |
double pt[MAXDIM]; |
146 |
> |
static double vldx[5], pt[MAXDIM]; |
147 |
|
register char **sa; |
148 |
|
register int i; |
149 |
+ |
#define lddx (vldx+1) |
150 |
|
|
151 |
|
setcolor(cval, 0.0, 0.0, 0.0); |
152 |
|
|
154 |
|
|
155 |
|
if (ldot <= FTINY && ldot >= -FTINY) |
156 |
|
return; /* too close to grazing */ |
157 |
+ |
|
158 |
|
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
159 |
|
return; /* wrong side */ |
160 |
|
|
161 |
< |
if (ldot > 0.0 && np->rdiff > FTINY) { |
161 |
> |
if (ldot > 0.0) { |
162 |
|
/* |
163 |
|
* Compute and add diffuse reflected component to returned |
164 |
|
* color. The diffuse reflected component will always be |
165 |
|
* modified by the color of the material. |
166 |
|
*/ |
167 |
< |
copycolor(ctmp, np->mcolor); |
168 |
< |
dtmp = ldot * omega * np->rdiff / PI; |
167 |
> |
copycolor(ctmp, np->rdiff); |
168 |
> |
dtmp = ldot * omega / PI; |
169 |
|
scalecolor(ctmp, dtmp); |
170 |
|
addcolor(cval, ctmp); |
171 |
< |
} |
113 |
< |
if (ldot < 0.0 && np->tdiff > FTINY) { |
171 |
> |
} else { |
172 |
|
/* |
173 |
|
* Diffuse transmitted component. |
174 |
|
*/ |
175 |
< |
copycolor(ctmp, np->mcolor); |
176 |
< |
dtmp = -ldot * omega * np->tdiff / PI; |
175 |
> |
copycolor(ctmp, np->tdiff); |
176 |
> |
dtmp = -ldot * omega / PI; |
177 |
|
scalecolor(ctmp, dtmp); |
178 |
|
addcolor(cval, ctmp); |
179 |
|
} |
180 |
|
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
181 |
|
return; /* no specular component */ |
182 |
|
/* set up function */ |
183 |
< |
setfunc(np->mp, np->pr); |
183 |
> |
setbrdfunc(np); |
184 |
|
sa = np->mp->oargs.sarg; |
185 |
|
errno = 0; |
186 |
|
/* transform light vector */ |
187 |
|
multv3(ldx, ldir, funcxf.xfm); |
188 |
|
for (i = 0; i < 3; i++) |
189 |
< |
ldx[i] /= funcxf.sca; |
189 |
> |
lddx[i] = ldx[i]/funcxf.sca; |
190 |
> |
lddx[3] = omega; |
191 |
|
/* compute BRTDF */ |
192 |
|
if (np->mp->otype == MAT_BRTDF) { |
193 |
< |
colval(ctmp,RED) = funvalue(sa[6], 3, ldx); |
193 |
> |
if (sa[6][0] == '0') /* special case */ |
194 |
> |
colval(ctmp,RED) = 0.0; |
195 |
> |
else |
196 |
> |
colval(ctmp,RED) = funvalue(sa[6], 4, lddx); |
197 |
|
if (!strcmp(sa[7],sa[6])) |
198 |
|
colval(ctmp,GRN) = colval(ctmp,RED); |
199 |
|
else |
200 |
< |
colval(ctmp,GRN) = funvalue(sa[7], 3, ldx); |
200 |
> |
colval(ctmp,GRN) = funvalue(sa[7], 4, lddx); |
201 |
|
if (!strcmp(sa[8],sa[6])) |
202 |
|
colval(ctmp,BLU) = colval(ctmp,RED); |
203 |
|
else if (!strcmp(sa[8],sa[7])) |
204 |
|
colval(ctmp,BLU) = colval(ctmp,GRN); |
205 |
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else |
206 |
< |
colval(ctmp,BLU) = funvalue(sa[8], 3, ldx); |
206 |
> |
colval(ctmp,BLU) = funvalue(sa[8], 4, lddx); |
207 |
|
dtmp = bright(ctmp); |
208 |
|
} else if (np->dp == NULL) { |
209 |
< |
dtmp = funvalue(sa[0], 3, ldx); |
209 |
> |
dtmp = funvalue(sa[0], 4, lddx); |
210 |
|
setcolor(ctmp, dtmp, dtmp, dtmp); |
211 |
|
} else { |
212 |
|
for (i = 0; i < np->dp->nd; i++) |
213 |
< |
pt[i] = funvalue(sa[3+i], 3, ldx); |
214 |
< |
dtmp = datavalue(np->dp, pt); |
215 |
< |
dtmp = funvalue(sa[0], 1, &dtmp); |
213 |
> |
pt[i] = funvalue(sa[3+i], 4, lddx); |
214 |
> |
vldx[0] = datavalue(np->dp, pt); |
215 |
> |
dtmp = funvalue(sa[0], 5, vldx); |
216 |
|
setcolor(ctmp, dtmp, dtmp, dtmp); |
217 |
|
} |
218 |
< |
if (errno) |
219 |
< |
goto computerr; |
218 |
> |
if (errno) { |
219 |
> |
objerror(np->mp, WARNING, "compute error"); |
220 |
> |
return; |
221 |
> |
} |
222 |
|
if (dtmp <= FTINY) |
223 |
|
return; |
224 |
|
if (ldot > 0.0) { |
225 |
|
/* |
226 |
|
* Compute reflected non-diffuse component. |
227 |
|
*/ |
228 |
< |
if (np->mp->otype == MAT_MFUNC || np->mp->otype == MAT_MDATA) |
228 |
> |
if (np->mp->otype == MAT_MFUNC | np->mp->otype == MAT_MDATA) |
229 |
|
multcolor(ctmp, np->mcolor); |
230 |
|
dtmp = ldot * omega * np->rspec; |
231 |
|
scalecolor(ctmp, dtmp); |
234 |
|
/* |
235 |
|
* Compute transmitted non-diffuse component. |
236 |
|
*/ |
237 |
< |
if (np->mp->otype == MAT_TFUNC || np->mp->otype == MAT_TDATA) |
237 |
> |
if (np->mp->otype == MAT_TFUNC | np->mp->otype == MAT_TDATA) |
238 |
|
multcolor(ctmp, np->mcolor); |
239 |
|
dtmp = -ldot * omega * np->tspec; |
240 |
|
scalecolor(ctmp, dtmp); |
241 |
|
addcolor(cval, ctmp); |
242 |
|
} |
243 |
< |
return; |
180 |
< |
computerr: |
181 |
< |
objerror(np->mp, WARNING, "compute error"); |
182 |
< |
return; |
243 |
> |
#undef lddx |
244 |
|
} |
245 |
|
|
246 |
|
|
247 |
< |
m_brdf(m, r) /* color a ray which hit a BRDF material */ |
247 |
> |
int |
248 |
> |
m_brdf(m, r) /* color a ray that hit a BRDTfunc material */ |
249 |
|
register OBJREC *m; |
250 |
|
register RAY *r; |
251 |
|
{ |
252 |
< |
int minsa, minfa; |
252 |
> |
int hitfront = 1; |
253 |
|
BRDFDAT nd; |
254 |
+ |
RAY sr; |
255 |
|
double transtest, transdist; |
256 |
+ |
int hasrefl, hastrans; |
257 |
|
COLOR ctmp; |
258 |
< |
double dtmp; |
259 |
< |
FVECT vec; |
258 |
> |
FVECT vtmp; |
259 |
> |
register MFUNC *mf; |
260 |
|
register int i; |
261 |
|
/* check arguments */ |
262 |
< |
switch (m->otype) { |
263 |
< |
case MAT_PFUNC: case MAT_MFUNC: |
264 |
< |
minsa = 2; minfa = 4; break; |
265 |
< |
case MAT_PDATA: case MAT_MDATA: |
266 |
< |
minsa = 4; minfa = 4; break; |
267 |
< |
case MAT_TFUNC: |
268 |
< |
minsa = 2; minfa = 6; break; |
269 |
< |
case MAT_TDATA: |
270 |
< |
minsa = 4; minfa = 6; break; |
271 |
< |
case MAT_BRTDF: |
272 |
< |
minsa = 10; minfa = 6; break; |
262 |
> |
if (m->oargs.nsargs < 10 | m->oargs.nfargs < 9) |
263 |
> |
objerror(m, USER, "bad # arguments"); |
264 |
> |
nd.mp = m; |
265 |
> |
nd.pr = r; |
266 |
> |
/* dummy values */ |
267 |
> |
nd.rspec = nd.tspec = 1.0; |
268 |
> |
nd.trans = 0.5; |
269 |
> |
/* diffuse reflectance */ |
270 |
> |
if (r->rod > 0.0) |
271 |
> |
setcolor(nd.rdiff, m->oargs.farg[0], |
272 |
> |
m->oargs.farg[1], |
273 |
> |
m->oargs.farg[2]); |
274 |
> |
else |
275 |
> |
setcolor(nd.rdiff, m->oargs.farg[3], |
276 |
> |
m->oargs.farg[4], |
277 |
> |
m->oargs.farg[5]); |
278 |
> |
/* diffuse transmittance */ |
279 |
> |
setcolor(nd.tdiff, m->oargs.farg[6], |
280 |
> |
m->oargs.farg[7], |
281 |
> |
m->oargs.farg[8]); |
282 |
> |
/* get modifiers */ |
283 |
> |
raytexture(r, m->omod); |
284 |
> |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
285 |
> |
if (r->rod < 0.0) { /* orient perturbed values */ |
286 |
> |
nd.pdot = -nd.pdot; |
287 |
> |
for (i = 0; i < 3; i++) { |
288 |
> |
nd.pnorm[i] = -nd.pnorm[i]; |
289 |
> |
r->pert[i] = -r->pert[i]; |
290 |
> |
} |
291 |
> |
hitfront = 0; |
292 |
|
} |
293 |
< |
if (m->oargs.nsargs < minsa || m->oargs.nfargs < minfa) |
293 |
> |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
294 |
> |
multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
295 |
> |
multcolor(nd.tdiff, nd.mcolor); |
296 |
> |
hasrefl = bright(nd.rdiff) > FTINY; |
297 |
> |
hastrans = bright(nd.tdiff) > FTINY; |
298 |
> |
/* load cal file */ |
299 |
> |
nd.dp = NULL; |
300 |
> |
mf = getfunc(m, 9, 0x3f, 0); |
301 |
> |
/* compute transmitted ray */ |
302 |
> |
setbrdfunc(&nd); |
303 |
> |
transtest = 0; |
304 |
> |
transdist = r->rot; |
305 |
> |
errno = 0; |
306 |
> |
setcolor(ctmp, evalue(mf->ep[3]), |
307 |
> |
evalue(mf->ep[4]), |
308 |
> |
evalue(mf->ep[5])); |
309 |
> |
if (errno) |
310 |
> |
objerror(m, WARNING, "compute error"); |
311 |
> |
else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
312 |
> |
if (!(r->crtype & SHADOW) && |
313 |
> |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
314 |
> |
for (i = 0; i < 3; i++) /* perturb direction */ |
315 |
> |
sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
316 |
> |
if (normalize(sr.rdir) == 0.0) { |
317 |
> |
objerror(m, WARNING, "illegal perturbation"); |
318 |
> |
VCOPY(sr.rdir, r->rdir); |
319 |
> |
} |
320 |
> |
} else { |
321 |
> |
VCOPY(sr.rdir, r->rdir); |
322 |
> |
transtest = 2; |
323 |
> |
} |
324 |
> |
rayvalue(&sr); |
325 |
> |
multcolor(sr.rcol, ctmp); |
326 |
> |
addcolor(r->rcol, sr.rcol); |
327 |
> |
transtest *= bright(sr.rcol); |
328 |
> |
transdist = r->rot + sr.rt; |
329 |
> |
} |
330 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
331 |
> |
return(1); |
332 |
> |
/* compute reflected ray */ |
333 |
> |
setbrdfunc(&nd); |
334 |
> |
errno = 0; |
335 |
> |
setcolor(ctmp, evalue(mf->ep[0]), |
336 |
> |
evalue(mf->ep[1]), |
337 |
> |
evalue(mf->ep[2])); |
338 |
> |
if (errno) |
339 |
> |
objerror(m, WARNING, "compute error"); |
340 |
> |
else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
341 |
> |
for (i = 0; i < 3; i++) |
342 |
> |
sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
343 |
> |
rayvalue(&sr); |
344 |
> |
multcolor(sr.rcol, ctmp); |
345 |
> |
addcolor(r->rcol, sr.rcol); |
346 |
> |
} |
347 |
> |
/* compute ambient */ |
348 |
> |
if (hasrefl) { |
349 |
> |
if (!hitfront) |
350 |
> |
flipsurface(r); |
351 |
> |
ambient(ctmp, r, nd.pnorm); |
352 |
> |
multcolor(ctmp, nd.rdiff); |
353 |
> |
addcolor(r->rcol, ctmp); /* add to returned color */ |
354 |
> |
if (!hitfront) |
355 |
> |
flipsurface(r); |
356 |
> |
} |
357 |
> |
if (hastrans) { /* from other side */ |
358 |
> |
if (hitfront) |
359 |
> |
flipsurface(r); |
360 |
> |
vtmp[0] = -nd.pnorm[0]; |
361 |
> |
vtmp[1] = -nd.pnorm[1]; |
362 |
> |
vtmp[2] = -nd.pnorm[2]; |
363 |
> |
ambient(ctmp, r, vtmp); |
364 |
> |
multcolor(ctmp, nd.tdiff); |
365 |
> |
addcolor(r->rcol, ctmp); |
366 |
> |
if (hitfront) |
367 |
> |
flipsurface(r); |
368 |
> |
} |
369 |
> |
if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
370 |
> |
direct(r, dirbrdf, &nd); /* add direct component */ |
371 |
> |
/* check distance */ |
372 |
> |
if (transtest > bright(r->rcol)) |
373 |
> |
r->rt = transdist; |
374 |
> |
|
375 |
> |
return(1); |
376 |
> |
} |
377 |
> |
|
378 |
> |
|
379 |
> |
|
380 |
> |
int |
381 |
> |
m_brdf2(m, r) /* color a ray that hit a BRDF material */ |
382 |
> |
register OBJREC *m; |
383 |
> |
register RAY *r; |
384 |
> |
{ |
385 |
> |
BRDFDAT nd; |
386 |
> |
COLOR ctmp; |
387 |
> |
FVECT vtmp; |
388 |
> |
double dtmp; |
389 |
> |
/* always a shadow */ |
390 |
> |
if (r->crtype & SHADOW) |
391 |
> |
return(1); |
392 |
> |
/* check arguments */ |
393 |
> |
if (m->oargs.nsargs < (hasdata(m->otype)?4:2) | m->oargs.nfargs < |
394 |
> |
(m->otype==MAT_TFUNC|m->otype==MAT_TDATA?6:4)) |
395 |
|
objerror(m, USER, "bad # arguments"); |
396 |
|
nd.mp = m; |
397 |
|
nd.pr = r; |
398 |
+ |
/* get material color */ |
399 |
+ |
setcolor(nd.mcolor, m->oargs.farg[0], |
400 |
+ |
m->oargs.farg[1], |
401 |
+ |
m->oargs.farg[2]); |
402 |
|
/* get specular component */ |
403 |
|
nd.rspec = m->oargs.farg[3]; |
404 |
< |
/* compute transmission */ |
405 |
< |
if (m->otype == MAT_TFUNC || m->otype == MAT_TDATA |
218 |
< |
|| m->otype == MAT_BRTDF) { |
404 |
> |
/* compute transmittance */ |
405 |
> |
if (m->otype == MAT_TFUNC | m->otype == MAT_TDATA) { |
406 |
|
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
407 |
|
nd.tspec = nd.trans * m->oargs.farg[5]; |
408 |
< |
nd.tdiff = nd.trans - nd.tspec; |
409 |
< |
} else |
410 |
< |
nd.tdiff = nd.tspec = nd.trans = 0.0; |
411 |
< |
/* early shadow check */ |
412 |
< |
if (r->crtype & SHADOW && (m->otype != MAT_BRTDF || nd.tspec <= FTINY)) |
413 |
< |
return; |
414 |
< |
/* diffuse reflection */ |
415 |
< |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
416 |
< |
/* get material color */ |
417 |
< |
setcolor(nd.mcolor, m->oargs.farg[0], |
418 |
< |
m->oargs.farg[1], |
419 |
< |
m->oargs.farg[2]); |
420 |
< |
/* fix orientation */ |
421 |
< |
if (r->rod < 0.0) |
422 |
< |
flipsurface(r); |
408 |
> |
dtmp = nd.trans - nd.tspec; |
409 |
> |
setcolor(nd.tdiff, dtmp, dtmp, dtmp); |
410 |
> |
} else { |
411 |
> |
nd.tspec = nd.trans = 0.0; |
412 |
> |
setcolor(nd.tdiff, 0.0, 0.0, 0.0); |
413 |
> |
} |
414 |
> |
/* compute reflectance */ |
415 |
> |
dtmp = 1.0 - nd.trans - nd.rspec; |
416 |
> |
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
417 |
> |
/* check for back side */ |
418 |
> |
if (r->rod < 0.0) { |
419 |
> |
if (!backvis && m->otype != MAT_TFUNC |
420 |
> |
&& m->otype != MAT_TDATA) { |
421 |
> |
raytrans(r); |
422 |
> |
return(1); |
423 |
> |
} |
424 |
> |
flipsurface(r); /* reorient if backvis */ |
425 |
> |
} |
426 |
|
/* get modifiers */ |
427 |
|
raytexture(r, m->omod); |
428 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
429 |
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
430 |
< |
transtest = 0; |
430 |
> |
multcolor(nd.rdiff, nd.mcolor); |
431 |
> |
multcolor(nd.tdiff, nd.mcolor); |
432 |
|
/* load auxiliary files */ |
433 |
< |
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA |
243 |
< |
|| m->otype == MAT_TDATA) { |
433 |
> |
if (hasdata(m->otype)) { |
434 |
|
nd.dp = getdata(m->oargs.sarg[1]); |
435 |
< |
for (i = 3; i < m->oargs.nsargs; i++) |
246 |
< |
if (m->oargs.sarg[i][0] == '-') |
247 |
< |
break; |
248 |
< |
if (i-3 != nd.dp->nd) |
249 |
< |
objerror(m, USER, "dimension error"); |
250 |
< |
if (!fundefined(m->oargs.sarg[3])) |
251 |
< |
loadfunc(m->oargs.sarg[2]); |
252 |
< |
} else if (m->otype == MAT_BRTDF) { |
253 |
< |
nd.dp = NULL; |
254 |
< |
if (!fundefined(m->oargs.sarg[7])) |
255 |
< |
loadfunc(m->oargs.sarg[9]); |
435 |
> |
getfunc(m, 2, 0, 0); |
436 |
|
} else { |
437 |
|
nd.dp = NULL; |
438 |
< |
if (!fundefined(m->oargs.sarg[0])) |
259 |
< |
loadfunc(m->oargs.sarg[1]); |
438 |
> |
getfunc(m, 1, 0, 0); |
439 |
|
} |
261 |
– |
/* set special variables */ |
262 |
– |
setfunc(m, r); |
263 |
– |
multv3(vec, nd.pnorm, funcxf.xfm); |
264 |
– |
varset("NxP", '=', vec[0]/funcxf.sca); |
265 |
– |
varset("NyP", '=', vec[1]/funcxf.sca); |
266 |
– |
varset("NzP", '=', vec[2]/funcxf.sca); |
267 |
– |
varset("RdotP", '=', nd.pdot); |
268 |
– |
varset("CrP", '=', colval(nd.mcolor,RED)); |
269 |
– |
varset("CgP", '=', colval(nd.mcolor,GRN)); |
270 |
– |
varset("CbP", '=', colval(nd.mcolor,BLU)); |
271 |
– |
/* compute transmitted ray */ |
272 |
– |
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
273 |
– |
RAY sr; |
274 |
– |
errno = 0; |
275 |
– |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
276 |
– |
varvalue(m->oargs.sarg[1]), |
277 |
– |
varvalue(m->oargs.sarg[2])); |
278 |
– |
scalecolor(ctmp, nd.tspec); |
279 |
– |
if (errno) |
280 |
– |
objerror(m, WARNING, "compute error"); |
281 |
– |
else if ((dtmp = bright(ctmp)) > FTINY && |
282 |
– |
rayorigin(&sr, r, TRANS, dtmp) == 0) { |
283 |
– |
if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
284 |
– |
for (i = 0; i < 3; i++) /* perturb direction */ |
285 |
– |
sr.rdir[i] = r->rdir[i] - |
286 |
– |
.75*r->pert[i]; |
287 |
– |
normalize(sr.rdir); |
288 |
– |
} else { |
289 |
– |
VCOPY(sr.rdir, r->rdir); |
290 |
– |
transtest = 2; |
291 |
– |
} |
292 |
– |
rayvalue(&sr); |
293 |
– |
multcolor(sr.rcol, ctmp); |
294 |
– |
addcolor(r->rcol, sr.rcol); |
295 |
– |
transtest *= bright(sr.rcol); |
296 |
– |
transdist = r->rot + sr.rt; |
297 |
– |
} |
298 |
– |
} |
299 |
– |
if (r->crtype & SHADOW) /* the rest is shadow */ |
300 |
– |
return; |
301 |
– |
/* compute reflected ray */ |
302 |
– |
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
303 |
– |
RAY sr; |
304 |
– |
errno = 0; |
305 |
– |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
306 |
– |
varvalue(m->oargs.sarg[4]), |
307 |
– |
varvalue(m->oargs.sarg[5])); |
308 |
– |
scalecolor(ctmp, nd.rspec); |
309 |
– |
if (errno) |
310 |
– |
objerror(m, WARNING, "compute error"); |
311 |
– |
else if ((dtmp = bright(ctmp)) > FTINY && |
312 |
– |
rayorigin(&sr, r, REFLECTED, dtmp) == 0) { |
313 |
– |
for (i = 0; i < 3; i++) |
314 |
– |
sr.rdir[i] = r->rdir[i] + |
315 |
– |
2.0*nd.pdot*nd.pnorm[i]; |
316 |
– |
rayvalue(&sr); |
317 |
– |
multcolor(sr.rcol, ctmp); |
318 |
– |
addcolor(r->rcol, sr.rcol); |
319 |
– |
} |
320 |
– |
} |
440 |
|
/* compute ambient */ |
441 |
< |
if (nd.rdiff > FTINY) { |
442 |
< |
ambient(ctmp, r); |
443 |
< |
if (m->otype == MAT_BRTDF) |
325 |
< |
scalecolor(ctmp, nd.rdiff); |
326 |
< |
else |
327 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
441 |
> |
if (nd.trans < 1.0-FTINY) { |
442 |
> |
ambient(ctmp, r, nd.pnorm); |
443 |
> |
scalecolor(ctmp, 1.0-nd.trans); |
444 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
445 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
446 |
|
} |
447 |
< |
if (nd.tdiff > FTINY) { /* from other side */ |
447 |
> |
if (nd.trans > FTINY) { /* from other side */ |
448 |
|
flipsurface(r); |
449 |
< |
ambient(ctmp, r); |
450 |
< |
if (m->otype == MAT_BRTDF) |
451 |
< |
scalecolor(ctmp, nd.tdiff); |
452 |
< |
else |
453 |
< |
scalecolor(ctmp, nd.trans); |
449 |
> |
vtmp[0] = -nd.pnorm[0]; |
450 |
> |
vtmp[1] = -nd.pnorm[1]; |
451 |
> |
vtmp[2] = -nd.pnorm[2]; |
452 |
> |
ambient(ctmp, r, vtmp); |
453 |
> |
scalecolor(ctmp, nd.trans); |
454 |
|
multcolor(ctmp, nd.mcolor); |
455 |
|
addcolor(r->rcol, ctmp); |
456 |
|
flipsurface(r); |
457 |
|
} |
458 |
|
/* add direct component */ |
459 |
|
direct(r, dirbrdf, &nd); |
460 |
< |
/* check distance */ |
461 |
< |
if (transtest > bright(r->rcol)) |
462 |
< |
r->rt = transdist; |
460 |
> |
|
461 |
> |
return(1); |
462 |
> |
} |
463 |
> |
|
464 |
> |
|
465 |
> |
int |
466 |
> |
setbrdfunc(np) /* set up brdf function and variables */ |
467 |
> |
register BRDFDAT *np; |
468 |
> |
{ |
469 |
> |
FVECT vec; |
470 |
> |
|
471 |
> |
if (setfunc(np->mp, np->pr) == 0) |
472 |
> |
return(0); /* it's OK, setfunc says we're done */ |
473 |
> |
/* else (re)assign special variables */ |
474 |
> |
multv3(vec, np->pnorm, funcxf.xfm); |
475 |
> |
varset("NxP", '=', vec[0]/funcxf.sca); |
476 |
> |
varset("NyP", '=', vec[1]/funcxf.sca); |
477 |
> |
varset("NzP", '=', vec[2]/funcxf.sca); |
478 |
> |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
479 |
> |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
480 |
> |
varset("CrP", '=', colval(np->mcolor,RED)); |
481 |
> |
varset("CgP", '=', colval(np->mcolor,GRN)); |
482 |
> |
varset("CbP", '=', colval(np->mcolor,BLU)); |
483 |
> |
return(1); |
484 |
|
} |