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greg |
1.1 |
#ifndef lint |
2 |
greg |
2.15 |
static const char RCSid[] = "$Id$"; |
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greg |
1.1 |
#endif |
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/* |
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* Shading for materials with arbitrary BRDF's |
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*/ |
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greg |
2.15 |
/* ==================================================================== |
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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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greg |
1.1 |
#include "ray.h" |
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#include "data.h" |
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#include "otypes.h" |
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greg |
2.2 |
#include "func.h" |
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73 |
greg |
1.1 |
/* |
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* Arguments to this material include the color and specularity. |
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* String arguments include the reflection function and files. |
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* The BRDF is currently used just for the specular component to light |
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* sources. Reflectance values or data coordinates are functions |
78 |
greg |
2.7 |
* of the direction to the light source. (Data modification functions |
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* are passed the source direction as args 2-4.) |
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greg |
1.1 |
* We orient the surface towards the incoming ray, so a single |
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* surface can be used to represent an infinitely thin object. |
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* |
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* Arguments for MAT_PFUNC and MAT_MFUNC are: |
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greg |
1.4 |
* 2+ func funcfile transform |
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greg |
1.1 |
* 0 |
86 |
greg |
1.4 |
* 4+ red grn blu specularity A5 .. |
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greg |
1.1 |
* |
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* Arguments for MAT_PDATA and MAT_MDATA are: |
89 |
greg |
1.4 |
* 4+ func datafile funcfile v0 .. transform |
90 |
greg |
1.1 |
* 0 |
91 |
greg |
1.4 |
* 4+ red grn blu specularity A5 .. |
92 |
greg |
1.5 |
* |
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* Arguments for MAT_TFUNC are: |
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* 2+ func funcfile transform |
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* 0 |
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* 4+ red grn blu rspec trans tspec A7 .. |
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* |
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* Arguments for MAT_TDATA are: |
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* 4+ func datafile funcfile v0 .. transform |
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* 0 |
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* 4+ red grn blu rspec trans tspec A7 .. |
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* |
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* Arguments for the more general MAT_BRTDF are: |
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* 10+ rrefl grefl brefl |
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* rtrns gtrns btrns |
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* rbrtd gbrtd bbrtd |
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* funcfile transform |
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* 0 |
109 |
greg |
2.6 |
* 9+ rdf gdf bdf |
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* rdb gdb bdb |
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* rdt gdt bdt A10 .. |
112 |
greg |
1.5 |
* |
113 |
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* In addition to the normal variables available to functions, |
114 |
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* we define the following: |
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* NxP, NyP, NzP - perturbed surface normal |
116 |
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* RdotP - perturbed ray dot product |
117 |
greg |
2.6 |
* CrP, CgP, CbP - perturbed material color (or pattern) |
118 |
greg |
1.1 |
*/ |
119 |
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120 |
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typedef struct { |
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OBJREC *mp; /* material pointer */ |
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RAY *pr; /* intersected ray */ |
123 |
greg |
1.5 |
DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
124 |
greg |
2.6 |
COLOR mcolor; /* material (or pattern) color */ |
125 |
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COLOR rdiff; /* diffuse reflection */ |
126 |
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COLOR tdiff; /* diffuse transmission */ |
127 |
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double rspec; /* specular reflectance (1 for BRDTF) */ |
128 |
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double trans; /* transmissivity (.5 for BRDTF) */ |
129 |
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double tspec; /* specular transmittance (1 for BRDTF) */ |
130 |
greg |
1.1 |
FVECT pnorm; /* perturbed surface normal */ |
131 |
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double pdot; /* perturbed dot product */ |
132 |
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} BRDFDAT; /* BRDF material data */ |
133 |
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134 |
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135 |
greg |
2.15 |
static void |
136 |
greg |
1.1 |
dirbrdf(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
138 |
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register BRDFDAT *np; /* material data */ |
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FVECT ldir; /* light source direction */ |
140 |
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double omega; /* light source size */ |
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{ |
142 |
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double ldot; |
143 |
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double dtmp; |
144 |
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COLOR ctmp; |
145 |
greg |
1.4 |
FVECT ldx; |
146 |
greg |
2.12 |
static double vldx[5], pt[MAXDIM]; |
147 |
greg |
1.5 |
register char **sa; |
148 |
greg |
1.1 |
register int i; |
149 |
greg |
2.12 |
#define lddx (vldx+1) |
150 |
greg |
1.1 |
|
151 |
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setcolor(cval, 0.0, 0.0, 0.0); |
152 |
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153 |
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ldot = DOT(np->pnorm, ldir); |
154 |
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155 |
greg |
1.5 |
if (ldot <= FTINY && ldot >= -FTINY) |
156 |
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return; /* too close to grazing */ |
157 |
greg |
2.6 |
|
158 |
greg |
1.5 |
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
159 |
greg |
1.1 |
return; /* wrong side */ |
160 |
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161 |
greg |
2.6 |
if (ldot > 0.0) { |
162 |
greg |
1.1 |
/* |
163 |
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* Compute and add diffuse reflected component to returned |
164 |
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* color. The diffuse reflected component will always be |
165 |
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* modified by the color of the material. |
166 |
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*/ |
167 |
greg |
2.6 |
copycolor(ctmp, np->rdiff); |
168 |
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dtmp = ldot * omega / PI; |
169 |
greg |
1.1 |
scalecolor(ctmp, dtmp); |
170 |
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addcolor(cval, ctmp); |
171 |
greg |
2.6 |
} else { |
172 |
greg |
1.1 |
/* |
173 |
greg |
1.5 |
* Diffuse transmitted component. |
174 |
greg |
1.1 |
*/ |
175 |
greg |
2.6 |
copycolor(ctmp, np->tdiff); |
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dtmp = -ldot * omega / PI; |
177 |
greg |
1.5 |
scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
179 |
greg |
1.1 |
} |
180 |
greg |
1.5 |
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
181 |
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return; /* no specular component */ |
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/* set up function */ |
183 |
greg |
1.10 |
setbrdfunc(np); |
184 |
greg |
1.5 |
sa = np->mp->oargs.sarg; |
185 |
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errno = 0; |
186 |
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/* transform light vector */ |
187 |
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multv3(ldx, ldir, funcxf.xfm); |
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for (i = 0; i < 3; i++) |
189 |
greg |
2.3 |
lddx[i] = ldx[i]/funcxf.sca; |
190 |
greg |
2.12 |
lddx[3] = omega; |
191 |
greg |
1.5 |
/* compute BRTDF */ |
192 |
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if (np->mp->otype == MAT_BRTDF) { |
193 |
greg |
2.6 |
if (sa[6][0] == '0') /* special case */ |
194 |
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colval(ctmp,RED) = 0.0; |
195 |
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else |
196 |
greg |
2.12 |
colval(ctmp,RED) = funvalue(sa[6], 4, lddx); |
197 |
greg |
1.7 |
if (!strcmp(sa[7],sa[6])) |
198 |
greg |
1.5 |
colval(ctmp,GRN) = colval(ctmp,RED); |
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else |
200 |
greg |
2.12 |
colval(ctmp,GRN) = funvalue(sa[7], 4, lddx); |
201 |
greg |
1.7 |
if (!strcmp(sa[8],sa[6])) |
202 |
greg |
1.5 |
colval(ctmp,BLU) = colval(ctmp,RED); |
203 |
greg |
1.7 |
else if (!strcmp(sa[8],sa[7])) |
204 |
greg |
1.5 |
colval(ctmp,BLU) = colval(ctmp,GRN); |
205 |
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else |
206 |
greg |
2.12 |
colval(ctmp,BLU) = funvalue(sa[8], 4, lddx); |
207 |
greg |
1.5 |
dtmp = bright(ctmp); |
208 |
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} else if (np->dp == NULL) { |
209 |
greg |
2.12 |
dtmp = funvalue(sa[0], 4, lddx); |
210 |
greg |
1.5 |
setcolor(ctmp, dtmp, dtmp, dtmp); |
211 |
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} else { |
212 |
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for (i = 0; i < np->dp->nd; i++) |
213 |
greg |
2.12 |
pt[i] = funvalue(sa[3+i], 4, lddx); |
214 |
greg |
2.7 |
vldx[0] = datavalue(np->dp, pt); |
215 |
greg |
2.12 |
dtmp = funvalue(sa[0], 5, vldx); |
216 |
greg |
1.5 |
setcolor(ctmp, dtmp, dtmp, dtmp); |
217 |
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} |
218 |
greg |
2.2 |
if (errno) { |
219 |
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objerror(np->mp, WARNING, "compute error"); |
220 |
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return; |
221 |
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} |
222 |
greg |
1.5 |
if (dtmp <= FTINY) |
223 |
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return; |
224 |
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if (ldot > 0.0) { |
225 |
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/* |
226 |
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* Compute reflected non-diffuse component. |
227 |
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*/ |
228 |
greg |
2.6 |
if (np->mp->otype == MAT_MFUNC | np->mp->otype == MAT_MDATA) |
229 |
greg |
1.6 |
multcolor(ctmp, np->mcolor); |
230 |
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dtmp = ldot * omega * np->rspec; |
231 |
greg |
1.5 |
scalecolor(ctmp, dtmp); |
232 |
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addcolor(cval, ctmp); |
233 |
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} else { |
234 |
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/* |
235 |
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* Compute transmitted non-diffuse component. |
236 |
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*/ |
237 |
greg |
2.6 |
if (np->mp->otype == MAT_TFUNC | np->mp->otype == MAT_TDATA) |
238 |
greg |
1.6 |
multcolor(ctmp, np->mcolor); |
239 |
greg |
1.5 |
dtmp = -ldot * omega * np->tspec; |
240 |
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scalecolor(ctmp, dtmp); |
241 |
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addcolor(cval, ctmp); |
242 |
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} |
243 |
greg |
2.12 |
#undef lddx |
244 |
greg |
1.1 |
} |
245 |
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246 |
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247 |
greg |
2.15 |
int |
248 |
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m_brdf(m, r) /* color a ray that hit a BRDTfunc material */ |
249 |
greg |
1.1 |
register OBJREC *m; |
250 |
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register RAY *r; |
251 |
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{ |
252 |
greg |
2.15 |
int hitfront = 1; |
253 |
greg |
1.1 |
BRDFDAT nd; |
254 |
greg |
2.6 |
RAY sr; |
255 |
greg |
1.7 |
double transtest, transdist; |
256 |
greg |
2.6 |
int hasrefl, hastrans; |
257 |
greg |
1.1 |
COLOR ctmp; |
258 |
greg |
2.14 |
FVECT vtmp; |
259 |
greg |
2.6 |
register MFUNC *mf; |
260 |
greg |
1.1 |
register int i; |
261 |
greg |
1.5 |
/* check arguments */ |
262 |
greg |
2.6 |
if (m->oargs.nsargs < 10 | m->oargs.nfargs < 9) |
263 |
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objerror(m, USER, "bad # arguments"); |
264 |
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nd.mp = m; |
265 |
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nd.pr = r; |
266 |
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/* dummy values */ |
267 |
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nd.rspec = nd.tspec = 1.0; |
268 |
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nd.trans = 0.5; |
269 |
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/* diffuse reflectance */ |
270 |
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if (r->rod > 0.0) |
271 |
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setcolor(nd.rdiff, m->oargs.farg[0], |
272 |
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m->oargs.farg[1], |
273 |
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m->oargs.farg[2]); |
274 |
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else |
275 |
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setcolor(nd.rdiff, m->oargs.farg[3], |
276 |
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m->oargs.farg[4], |
277 |
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m->oargs.farg[5]); |
278 |
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/* diffuse transmittance */ |
279 |
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setcolor(nd.tdiff, m->oargs.farg[6], |
280 |
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m->oargs.farg[7], |
281 |
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m->oargs.farg[8]); |
282 |
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/* get modifiers */ |
283 |
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raytexture(r, m->omod); |
284 |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
285 |
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if (r->rod < 0.0) { /* orient perturbed values */ |
286 |
|
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nd.pdot = -nd.pdot; |
287 |
|
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for (i = 0; i < 3; i++) { |
288 |
|
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nd.pnorm[i] = -nd.pnorm[i]; |
289 |
|
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r->pert[i] = -r->pert[i]; |
290 |
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} |
291 |
greg |
2.15 |
hitfront = 0; |
292 |
greg |
1.5 |
} |
293 |
greg |
2.6 |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
294 |
|
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multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
295 |
|
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multcolor(nd.tdiff, nd.mcolor); |
296 |
|
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hasrefl = bright(nd.rdiff) > FTINY; |
297 |
|
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hastrans = bright(nd.tdiff) > FTINY; |
298 |
|
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/* load cal file */ |
299 |
|
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nd.dp = NULL; |
300 |
|
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mf = getfunc(m, 9, 0x3f, 0); |
301 |
|
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/* compute transmitted ray */ |
302 |
|
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setbrdfunc(&nd); |
303 |
|
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transtest = 0; |
304 |
greg |
2.8 |
transdist = r->rot; |
305 |
greg |
2.6 |
errno = 0; |
306 |
|
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setcolor(ctmp, evalue(mf->ep[3]), |
307 |
|
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evalue(mf->ep[4]), |
308 |
|
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evalue(mf->ep[5])); |
309 |
|
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if (errno) |
310 |
|
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objerror(m, WARNING, "compute error"); |
311 |
|
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else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
312 |
|
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if (!(r->crtype & SHADOW) && |
313 |
|
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DOT(r->pert,r->pert) > FTINY*FTINY) { |
314 |
|
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for (i = 0; i < 3; i++) /* perturb direction */ |
315 |
|
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sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
316 |
|
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if (normalize(sr.rdir) == 0.0) { |
317 |
|
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objerror(m, WARNING, "illegal perturbation"); |
318 |
|
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VCOPY(sr.rdir, r->rdir); |
319 |
|
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} |
320 |
|
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} else { |
321 |
|
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VCOPY(sr.rdir, r->rdir); |
322 |
|
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transtest = 2; |
323 |
|
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} |
324 |
|
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rayvalue(&sr); |
325 |
|
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multcolor(sr.rcol, ctmp); |
326 |
|
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addcolor(r->rcol, sr.rcol); |
327 |
|
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transtest *= bright(sr.rcol); |
328 |
|
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transdist = r->rot + sr.rt; |
329 |
|
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} |
330 |
|
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if (r->crtype & SHADOW) /* the rest is shadow */ |
331 |
greg |
2.10 |
return(1); |
332 |
greg |
2.6 |
/* compute reflected ray */ |
333 |
|
|
setbrdfunc(&nd); |
334 |
|
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errno = 0; |
335 |
|
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setcolor(ctmp, evalue(mf->ep[0]), |
336 |
|
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evalue(mf->ep[1]), |
337 |
|
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evalue(mf->ep[2])); |
338 |
|
|
if (errno) |
339 |
|
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objerror(m, WARNING, "compute error"); |
340 |
|
|
else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
341 |
|
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for (i = 0; i < 3; i++) |
342 |
|
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sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
343 |
|
|
rayvalue(&sr); |
344 |
|
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multcolor(sr.rcol, ctmp); |
345 |
|
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addcolor(r->rcol, sr.rcol); |
346 |
|
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} |
347 |
|
|
/* compute ambient */ |
348 |
|
|
if (hasrefl) { |
349 |
greg |
2.15 |
if (!hitfront) |
350 |
greg |
2.6 |
flipsurface(r); |
351 |
greg |
2.15 |
ambient(ctmp, r, nd.pnorm); |
352 |
greg |
2.6 |
multcolor(ctmp, nd.rdiff); |
353 |
|
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
354 |
greg |
2.15 |
if (!hitfront) |
355 |
greg |
2.6 |
flipsurface(r); |
356 |
|
|
} |
357 |
|
|
if (hastrans) { /* from other side */ |
358 |
greg |
2.15 |
if (hitfront) |
359 |
greg |
2.6 |
flipsurface(r); |
360 |
greg |
2.15 |
vtmp[0] = -nd.pnorm[0]; |
361 |
|
|
vtmp[1] = -nd.pnorm[1]; |
362 |
|
|
vtmp[2] = -nd.pnorm[2]; |
363 |
greg |
2.14 |
ambient(ctmp, r, vtmp); |
364 |
greg |
2.6 |
multcolor(ctmp, nd.tdiff); |
365 |
|
|
addcolor(r->rcol, ctmp); |
366 |
greg |
2.15 |
if (hitfront) |
367 |
greg |
2.6 |
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 |
greg |
2.10 |
|
375 |
|
|
return(1); |
376 |
greg |
2.6 |
} |
377 |
|
|
|
378 |
|
|
|
379 |
|
|
|
380 |
greg |
2.15 |
int |
381 |
|
|
m_brdf2(m, r) /* color a ray that hit a BRDF material */ |
382 |
greg |
2.6 |
register OBJREC *m; |
383 |
|
|
register RAY *r; |
384 |
|
|
{ |
385 |
|
|
BRDFDAT nd; |
386 |
|
|
COLOR ctmp; |
387 |
greg |
2.14 |
FVECT vtmp; |
388 |
greg |
2.6 |
double dtmp; |
389 |
|
|
/* always a shadow */ |
390 |
|
|
if (r->crtype & SHADOW) |
391 |
greg |
2.10 |
return(1); |
392 |
greg |
2.6 |
/* 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 |
greg |
1.1 |
objerror(m, USER, "bad # arguments"); |
396 |
|
|
nd.mp = m; |
397 |
|
|
nd.pr = r; |
398 |
greg |
2.6 |
/* get material color */ |
399 |
|
|
setcolor(nd.mcolor, m->oargs.farg[0], |
400 |
|
|
m->oargs.farg[1], |
401 |
|
|
m->oargs.farg[2]); |
402 |
greg |
1.5 |
/* get specular component */ |
403 |
|
|
nd.rspec = m->oargs.farg[3]; |
404 |
greg |
2.6 |
/* compute transmittance */ |
405 |
|
|
if (m->otype == MAT_TFUNC | m->otype == MAT_TDATA) { |
406 |
greg |
1.5 |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
407 |
|
|
nd.tspec = nd.trans * m->oargs.farg[5]; |
408 |
greg |
2.6 |
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 |
greg |
2.11 |
/* 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 |
greg |
1.5 |
/* 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 |
greg |
2.6 |
multcolor(nd.rdiff, nd.mcolor); |
431 |
|
|
multcolor(nd.tdiff, nd.mcolor); |
432 |
greg |
1.1 |
/* load auxiliary files */ |
433 |
greg |
2.2 |
if (hasdata(m->otype)) { |
434 |
greg |
1.1 |
nd.dp = getdata(m->oargs.sarg[1]); |
435 |
greg |
2.6 |
getfunc(m, 2, 0, 0); |
436 |
greg |
1.1 |
} else { |
437 |
|
|
nd.dp = NULL; |
438 |
greg |
2.6 |
getfunc(m, 1, 0, 0); |
439 |
greg |
1.1 |
} |
440 |
|
|
/* compute ambient */ |
441 |
greg |
2.6 |
if (nd.trans < 1.0-FTINY) { |
442 |
greg |
2.13 |
ambient(ctmp, r, nd.pnorm); |
443 |
greg |
2.6 |
scalecolor(ctmp, 1.0-nd.trans); |
444 |
greg |
1.1 |
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
445 |
|
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
446 |
greg |
1.5 |
} |
447 |
greg |
2.6 |
if (nd.trans > FTINY) { /* from other side */ |
448 |
greg |
1.5 |
flipsurface(r); |
449 |
greg |
2.14 |
vtmp[0] = -nd.pnorm[0]; |
450 |
|
|
vtmp[1] = -nd.pnorm[1]; |
451 |
|
|
vtmp[2] = -nd.pnorm[2]; |
452 |
|
|
ambient(ctmp, r, vtmp); |
453 |
greg |
2.6 |
scalecolor(ctmp, nd.trans); |
454 |
greg |
1.5 |
multcolor(ctmp, nd.mcolor); |
455 |
|
|
addcolor(r->rcol, ctmp); |
456 |
|
|
flipsurface(r); |
457 |
greg |
1.1 |
} |
458 |
|
|
/* add direct component */ |
459 |
|
|
direct(r, dirbrdf, &nd); |
460 |
greg |
2.10 |
|
461 |
|
|
return(1); |
462 |
greg |
1.10 |
} |
463 |
|
|
|
464 |
|
|
|
465 |
greg |
2.15 |
int |
466 |
greg |
1.10 |
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 |
greg |
1.11 |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
479 |
|
|
np->pdot >= 1.0 ? 1.0 : np->pdot); |
480 |
greg |
1.10 |
varset("CrP", '=', colval(np->mcolor,RED)); |
481 |
|
|
varset("CgP", '=', colval(np->mcolor,GRN)); |
482 |
|
|
varset("CbP", '=', colval(np->mcolor,BLU)); |
483 |
|
|
return(1); |
484 |
greg |
1.1 |
} |