1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.22 |
static const char RCSid[] = "$Id: m_brdf.c,v 2.21 2004/03/30 16:13:01 schorsch Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
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/* |
5 |
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* Shading for materials with arbitrary BRDF's |
6 |
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*/ |
7 |
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8 |
greg |
2.16 |
#include "copyright.h" |
9 |
greg |
2.15 |
|
10 |
greg |
1.1 |
#include "ray.h" |
11 |
greg |
2.20 |
#include "ambient.h" |
12 |
greg |
1.1 |
#include "data.h" |
13 |
schorsch |
2.21 |
#include "source.h" |
14 |
greg |
1.1 |
#include "otypes.h" |
15 |
schorsch |
2.21 |
#include "rtotypes.h" |
16 |
greg |
2.2 |
#include "func.h" |
17 |
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18 |
greg |
1.1 |
/* |
19 |
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* Arguments to this material include the color and specularity. |
20 |
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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 |
22 |
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* sources. Reflectance values or data coordinates are functions |
23 |
greg |
2.7 |
* of the direction to the light source. (Data modification functions |
24 |
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* are passed the source direction as args 2-4.) |
25 |
greg |
1.1 |
* We orient the surface towards the incoming ray, so a single |
26 |
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* surface can be used to represent an infinitely thin object. |
27 |
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* |
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* Arguments for MAT_PFUNC and MAT_MFUNC are: |
29 |
greg |
1.4 |
* 2+ func funcfile transform |
30 |
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1.1 |
* 0 |
31 |
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1.4 |
* 4+ red grn blu specularity A5 .. |
32 |
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1.1 |
* |
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* Arguments for MAT_PDATA and MAT_MDATA are: |
34 |
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1.4 |
* 4+ func datafile funcfile v0 .. transform |
35 |
greg |
1.1 |
* 0 |
36 |
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1.4 |
* 4+ red grn blu specularity A5 .. |
37 |
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1.5 |
* |
38 |
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* Arguments for MAT_TFUNC are: |
39 |
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* 2+ func funcfile transform |
40 |
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* 0 |
41 |
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* 4+ red grn blu rspec trans tspec A7 .. |
42 |
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* |
43 |
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* Arguments for MAT_TDATA are: |
44 |
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* 4+ func datafile funcfile v0 .. transform |
45 |
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* 0 |
46 |
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* 4+ red grn blu rspec trans tspec A7 .. |
47 |
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* |
48 |
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* Arguments for the more general MAT_BRTDF are: |
49 |
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* 10+ rrefl grefl brefl |
50 |
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* rtrns gtrns btrns |
51 |
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* rbrtd gbrtd bbrtd |
52 |
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* funcfile transform |
53 |
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* 0 |
54 |
greg |
2.6 |
* 9+ rdf gdf bdf |
55 |
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* rdb gdb bdb |
56 |
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* rdt gdt bdt A10 .. |
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greg |
1.5 |
* |
58 |
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* In addition to the normal variables available to functions, |
59 |
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* we define the following: |
60 |
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* NxP, NyP, NzP - perturbed surface normal |
61 |
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* RdotP - perturbed ray dot product |
62 |
greg |
2.6 |
* CrP, CgP, CbP - perturbed material color (or pattern) |
63 |
greg |
1.1 |
*/ |
64 |
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65 |
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typedef struct { |
66 |
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OBJREC *mp; /* material pointer */ |
67 |
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RAY *pr; /* intersected ray */ |
68 |
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1.5 |
DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
69 |
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2.6 |
COLOR mcolor; /* material (or pattern) color */ |
70 |
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COLOR rdiff; /* diffuse reflection */ |
71 |
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COLOR tdiff; /* diffuse transmission */ |
72 |
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double rspec; /* specular reflectance (1 for BRDTF) */ |
73 |
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double trans; /* transmissivity (.5 for BRDTF) */ |
74 |
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double tspec; /* specular transmittance (1 for BRDTF) */ |
75 |
greg |
1.1 |
FVECT pnorm; /* perturbed surface normal */ |
76 |
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double pdot; /* perturbed dot product */ |
77 |
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} BRDFDAT; /* BRDF material data */ |
78 |
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79 |
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80 |
schorsch |
2.21 |
static srcdirf_t dirbrdf; |
81 |
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static int setbrdfunc(BRDFDAT *np); |
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84 |
greg |
2.15 |
static void |
85 |
schorsch |
2.21 |
dirbrdf( /* compute source contribution */ |
86 |
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COLOR cval, /* returned coefficient */ |
87 |
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void *nnp, /* material data */ |
88 |
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FVECT ldir, /* light source direction */ |
89 |
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double omega /* light source size */ |
90 |
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) |
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greg |
1.1 |
{ |
92 |
schorsch |
2.21 |
register BRDFDAT *np = nnp; |
93 |
greg |
1.1 |
double ldot; |
94 |
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double dtmp; |
95 |
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COLOR ctmp; |
96 |
greg |
1.4 |
FVECT ldx; |
97 |
greg |
2.12 |
static double vldx[5], pt[MAXDIM]; |
98 |
greg |
1.5 |
register char **sa; |
99 |
greg |
1.1 |
register int i; |
100 |
greg |
2.12 |
#define lddx (vldx+1) |
101 |
greg |
1.1 |
|
102 |
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setcolor(cval, 0.0, 0.0, 0.0); |
103 |
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104 |
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ldot = DOT(np->pnorm, ldir); |
105 |
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106 |
greg |
1.5 |
if (ldot <= FTINY && ldot >= -FTINY) |
107 |
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return; /* too close to grazing */ |
108 |
greg |
2.6 |
|
109 |
greg |
1.5 |
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
110 |
greg |
1.1 |
return; /* wrong side */ |
111 |
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112 |
greg |
2.6 |
if (ldot > 0.0) { |
113 |
greg |
1.1 |
/* |
114 |
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* Compute and add diffuse reflected component to returned |
115 |
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* color. The diffuse reflected component will always be |
116 |
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* modified by the color of the material. |
117 |
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*/ |
118 |
greg |
2.6 |
copycolor(ctmp, np->rdiff); |
119 |
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dtmp = ldot * omega / PI; |
120 |
greg |
1.1 |
scalecolor(ctmp, dtmp); |
121 |
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addcolor(cval, ctmp); |
122 |
greg |
2.6 |
} else { |
123 |
greg |
1.1 |
/* |
124 |
greg |
1.5 |
* Diffuse transmitted component. |
125 |
greg |
1.1 |
*/ |
126 |
greg |
2.6 |
copycolor(ctmp, np->tdiff); |
127 |
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dtmp = -ldot * omega / PI; |
128 |
greg |
1.5 |
scalecolor(ctmp, dtmp); |
129 |
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addcolor(cval, ctmp); |
130 |
greg |
1.1 |
} |
131 |
greg |
1.5 |
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
132 |
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return; /* no specular component */ |
133 |
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/* set up function */ |
134 |
greg |
1.10 |
setbrdfunc(np); |
135 |
greg |
1.5 |
sa = np->mp->oargs.sarg; |
136 |
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errno = 0; |
137 |
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/* transform light vector */ |
138 |
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multv3(ldx, ldir, funcxf.xfm); |
139 |
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for (i = 0; i < 3; i++) |
140 |
greg |
2.3 |
lddx[i] = ldx[i]/funcxf.sca; |
141 |
greg |
2.12 |
lddx[3] = omega; |
142 |
greg |
1.5 |
/* compute BRTDF */ |
143 |
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if (np->mp->otype == MAT_BRTDF) { |
144 |
greg |
2.6 |
if (sa[6][0] == '0') /* special case */ |
145 |
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colval(ctmp,RED) = 0.0; |
146 |
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else |
147 |
greg |
2.12 |
colval(ctmp,RED) = funvalue(sa[6], 4, lddx); |
148 |
greg |
1.7 |
if (!strcmp(sa[7],sa[6])) |
149 |
greg |
1.5 |
colval(ctmp,GRN) = colval(ctmp,RED); |
150 |
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else |
151 |
greg |
2.12 |
colval(ctmp,GRN) = funvalue(sa[7], 4, lddx); |
152 |
greg |
1.7 |
if (!strcmp(sa[8],sa[6])) |
153 |
greg |
1.5 |
colval(ctmp,BLU) = colval(ctmp,RED); |
154 |
greg |
1.7 |
else if (!strcmp(sa[8],sa[7])) |
155 |
greg |
1.5 |
colval(ctmp,BLU) = colval(ctmp,GRN); |
156 |
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else |
157 |
greg |
2.12 |
colval(ctmp,BLU) = funvalue(sa[8], 4, lddx); |
158 |
greg |
1.5 |
dtmp = bright(ctmp); |
159 |
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} else if (np->dp == NULL) { |
160 |
greg |
2.12 |
dtmp = funvalue(sa[0], 4, lddx); |
161 |
greg |
1.5 |
setcolor(ctmp, dtmp, dtmp, dtmp); |
162 |
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} else { |
163 |
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for (i = 0; i < np->dp->nd; i++) |
164 |
greg |
2.12 |
pt[i] = funvalue(sa[3+i], 4, lddx); |
165 |
greg |
2.7 |
vldx[0] = datavalue(np->dp, pt); |
166 |
greg |
2.12 |
dtmp = funvalue(sa[0], 5, vldx); |
167 |
greg |
1.5 |
setcolor(ctmp, dtmp, dtmp, dtmp); |
168 |
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} |
169 |
greg |
2.18 |
if (errno == EDOM || errno == ERANGE) { |
170 |
greg |
2.2 |
objerror(np->mp, WARNING, "compute error"); |
171 |
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return; |
172 |
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} |
173 |
greg |
1.5 |
if (dtmp <= FTINY) |
174 |
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return; |
175 |
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if (ldot > 0.0) { |
176 |
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/* |
177 |
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* Compute reflected non-diffuse component. |
178 |
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*/ |
179 |
schorsch |
2.19 |
if ((np->mp->otype == MAT_MFUNC) | (np->mp->otype == MAT_MDATA)) |
180 |
greg |
1.6 |
multcolor(ctmp, np->mcolor); |
181 |
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dtmp = ldot * omega * np->rspec; |
182 |
greg |
1.5 |
scalecolor(ctmp, dtmp); |
183 |
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addcolor(cval, ctmp); |
184 |
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} else { |
185 |
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/* |
186 |
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* Compute transmitted non-diffuse component. |
187 |
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*/ |
188 |
schorsch |
2.19 |
if ((np->mp->otype == MAT_TFUNC) | (np->mp->otype == MAT_TDATA)) |
189 |
greg |
1.6 |
multcolor(ctmp, np->mcolor); |
190 |
greg |
1.5 |
dtmp = -ldot * omega * np->tspec; |
191 |
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scalecolor(ctmp, dtmp); |
192 |
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addcolor(cval, ctmp); |
193 |
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} |
194 |
greg |
2.12 |
#undef lddx |
195 |
greg |
1.1 |
} |
196 |
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197 |
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198 |
schorsch |
2.21 |
extern int |
199 |
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m_brdf( /* color a ray that hit a BRDTfunc material */ |
200 |
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register OBJREC *m, |
201 |
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register RAY *r |
202 |
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) |
203 |
greg |
1.1 |
{ |
204 |
greg |
2.15 |
int hitfront = 1; |
205 |
greg |
1.1 |
BRDFDAT nd; |
206 |
greg |
2.6 |
RAY sr; |
207 |
greg |
2.22 |
double mirtest=0, mirdist=0; |
208 |
greg |
1.7 |
double transtest, transdist; |
209 |
greg |
2.6 |
int hasrefl, hastrans; |
210 |
greg |
2.22 |
int hastexture; |
211 |
greg |
1.1 |
COLOR ctmp; |
212 |
greg |
2.14 |
FVECT vtmp; |
213 |
greg |
2.22 |
double d; |
214 |
greg |
2.6 |
register MFUNC *mf; |
215 |
greg |
1.1 |
register int i; |
216 |
greg |
1.5 |
/* check arguments */ |
217 |
schorsch |
2.19 |
if ((m->oargs.nsargs < 10) | (m->oargs.nfargs < 9)) |
218 |
greg |
2.6 |
objerror(m, USER, "bad # arguments"); |
219 |
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nd.mp = m; |
220 |
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nd.pr = r; |
221 |
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/* dummy values */ |
222 |
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nd.rspec = nd.tspec = 1.0; |
223 |
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nd.trans = 0.5; |
224 |
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/* diffuse reflectance */ |
225 |
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if (r->rod > 0.0) |
226 |
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setcolor(nd.rdiff, m->oargs.farg[0], |
227 |
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m->oargs.farg[1], |
228 |
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m->oargs.farg[2]); |
229 |
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else |
230 |
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setcolor(nd.rdiff, m->oargs.farg[3], |
231 |
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m->oargs.farg[4], |
232 |
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m->oargs.farg[5]); |
233 |
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/* diffuse transmittance */ |
234 |
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setcolor(nd.tdiff, m->oargs.farg[6], |
235 |
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m->oargs.farg[7], |
236 |
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m->oargs.farg[8]); |
237 |
greg |
2.17 |
/* get modifiers */ |
238 |
greg |
2.6 |
raytexture(r, m->omod); |
239 |
greg |
2.22 |
hastexture = DOT(r->pert,r->pert) > FTINY*FTINY; |
240 |
|
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if (hastexture) { /* perturb normal */ |
241 |
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nd.pdot = raynormal(nd.pnorm, r); |
242 |
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} else { |
243 |
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VCOPY(nd.pnorm, r->ron); |
244 |
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nd.pdot = r->rod; |
245 |
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} |
246 |
greg |
2.6 |
if (r->rod < 0.0) { /* orient perturbed values */ |
247 |
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nd.pdot = -nd.pdot; |
248 |
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for (i = 0; i < 3; i++) { |
249 |
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nd.pnorm[i] = -nd.pnorm[i]; |
250 |
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r->pert[i] = -r->pert[i]; |
251 |
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} |
252 |
greg |
2.15 |
hitfront = 0; |
253 |
greg |
1.5 |
} |
254 |
greg |
2.6 |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
255 |
|
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multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
256 |
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multcolor(nd.tdiff, nd.mcolor); |
257 |
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hasrefl = bright(nd.rdiff) > FTINY; |
258 |
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hastrans = bright(nd.tdiff) > FTINY; |
259 |
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/* load cal file */ |
260 |
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nd.dp = NULL; |
261 |
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mf = getfunc(m, 9, 0x3f, 0); |
262 |
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/* compute transmitted ray */ |
263 |
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setbrdfunc(&nd); |
264 |
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errno = 0; |
265 |
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setcolor(ctmp, evalue(mf->ep[3]), |
266 |
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evalue(mf->ep[4]), |
267 |
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evalue(mf->ep[5])); |
268 |
greg |
2.18 |
if (errno == EDOM || errno == ERANGE) |
269 |
greg |
2.6 |
objerror(m, WARNING, "compute error"); |
270 |
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else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
271 |
greg |
2.22 |
if (!(r->crtype & SHADOW) && hastexture) { |
272 |
greg |
2.6 |
for (i = 0; i < 3; i++) /* perturb direction */ |
273 |
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sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
274 |
|
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if (normalize(sr.rdir) == 0.0) { |
275 |
|
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objerror(m, WARNING, "illegal perturbation"); |
276 |
|
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VCOPY(sr.rdir, r->rdir); |
277 |
|
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} |
278 |
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} else { |
279 |
|
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VCOPY(sr.rdir, r->rdir); |
280 |
|
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} |
281 |
|
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rayvalue(&sr); |
282 |
|
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multcolor(sr.rcol, ctmp); |
283 |
|
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addcolor(r->rcol, sr.rcol); |
284 |
greg |
2.22 |
if (!hastexture) { |
285 |
|
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transtest = 2.0*bright(sr.rcol); |
286 |
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transdist = r->rot + sr.rt; |
287 |
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} |
288 |
greg |
2.6 |
} |
289 |
|
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if (r->crtype & SHADOW) /* the rest is shadow */ |
290 |
greg |
2.10 |
return(1); |
291 |
greg |
2.6 |
/* compute reflected ray */ |
292 |
|
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setbrdfunc(&nd); |
293 |
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errno = 0; |
294 |
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setcolor(ctmp, evalue(mf->ep[0]), |
295 |
|
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evalue(mf->ep[1]), |
296 |
|
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evalue(mf->ep[2])); |
297 |
greg |
2.18 |
if (errno == EDOM || errno == ERANGE) |
298 |
greg |
2.6 |
objerror(m, WARNING, "compute error"); |
299 |
|
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else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
300 |
|
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for (i = 0; i < 3; i++) |
301 |
|
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sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
302 |
|
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rayvalue(&sr); |
303 |
|
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multcolor(sr.rcol, ctmp); |
304 |
|
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addcolor(r->rcol, sr.rcol); |
305 |
greg |
2.22 |
if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) { |
306 |
|
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mirtest = 2.0*bright(sr.rcol); |
307 |
|
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mirdist = r->rot + sr.rt; |
308 |
|
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} |
309 |
greg |
2.6 |
} |
310 |
|
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/* compute ambient */ |
311 |
|
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if (hasrefl) { |
312 |
greg |
2.15 |
if (!hitfront) |
313 |
greg |
2.6 |
flipsurface(r); |
314 |
greg |
2.15 |
ambient(ctmp, r, nd.pnorm); |
315 |
greg |
2.6 |
multcolor(ctmp, nd.rdiff); |
316 |
|
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addcolor(r->rcol, ctmp); /* add to returned color */ |
317 |
greg |
2.15 |
if (!hitfront) |
318 |
greg |
2.6 |
flipsurface(r); |
319 |
|
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} |
320 |
|
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if (hastrans) { /* from other side */ |
321 |
greg |
2.15 |
if (hitfront) |
322 |
greg |
2.6 |
flipsurface(r); |
323 |
greg |
2.15 |
vtmp[0] = -nd.pnorm[0]; |
324 |
|
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vtmp[1] = -nd.pnorm[1]; |
325 |
|
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vtmp[2] = -nd.pnorm[2]; |
326 |
greg |
2.14 |
ambient(ctmp, r, vtmp); |
327 |
greg |
2.6 |
multcolor(ctmp, nd.tdiff); |
328 |
|
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addcolor(r->rcol, ctmp); |
329 |
greg |
2.15 |
if (hitfront) |
330 |
greg |
2.6 |
flipsurface(r); |
331 |
|
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} |
332 |
|
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if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
333 |
|
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direct(r, dirbrdf, &nd); /* add direct component */ |
334 |
greg |
2.22 |
|
335 |
|
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d = bright(r->rcol); /* set effective distance */ |
336 |
|
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if (transtest > d) |
337 |
greg |
2.6 |
r->rt = transdist; |
338 |
greg |
2.22 |
else if (mirtest > d) |
339 |
|
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r->rt = mirdist; |
340 |
greg |
2.10 |
|
341 |
|
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return(1); |
342 |
greg |
2.6 |
} |
343 |
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344 |
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345 |
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|
346 |
schorsch |
2.21 |
extern int |
347 |
|
|
m_brdf2( /* color a ray that hit a BRDF material */ |
348 |
|
|
register OBJREC *m, |
349 |
|
|
register RAY *r |
350 |
|
|
) |
351 |
greg |
2.6 |
{ |
352 |
|
|
BRDFDAT nd; |
353 |
|
|
COLOR ctmp; |
354 |
greg |
2.14 |
FVECT vtmp; |
355 |
greg |
2.6 |
double dtmp; |
356 |
|
|
/* always a shadow */ |
357 |
|
|
if (r->crtype & SHADOW) |
358 |
greg |
2.10 |
return(1); |
359 |
greg |
2.6 |
/* check arguments */ |
360 |
schorsch |
2.19 |
if ((m->oargs.nsargs < (hasdata(m->otype)?4:2)) | (m->oargs.nfargs < |
361 |
|
|
((m->otype==MAT_TFUNC)|(m->otype==MAT_TDATA)?6:4))) |
362 |
greg |
1.1 |
objerror(m, USER, "bad # arguments"); |
363 |
greg |
2.17 |
/* check for back side */ |
364 |
|
|
if (r->rod < 0.0) { |
365 |
|
|
if (!backvis && m->otype != MAT_TFUNC |
366 |
|
|
&& m->otype != MAT_TDATA) { |
367 |
|
|
raytrans(r); |
368 |
|
|
return(1); |
369 |
|
|
} |
370 |
|
|
raytexture(r, m->omod); |
371 |
|
|
flipsurface(r); /* reorient if backvis */ |
372 |
|
|
} else |
373 |
|
|
raytexture(r, m->omod); |
374 |
|
|
|
375 |
greg |
1.1 |
nd.mp = m; |
376 |
|
|
nd.pr = r; |
377 |
greg |
2.6 |
/* get material color */ |
378 |
|
|
setcolor(nd.mcolor, m->oargs.farg[0], |
379 |
|
|
m->oargs.farg[1], |
380 |
|
|
m->oargs.farg[2]); |
381 |
greg |
1.5 |
/* get specular component */ |
382 |
|
|
nd.rspec = m->oargs.farg[3]; |
383 |
greg |
2.6 |
/* compute transmittance */ |
384 |
schorsch |
2.19 |
if ((m->otype == MAT_TFUNC) | (m->otype == MAT_TDATA)) { |
385 |
greg |
1.5 |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
386 |
|
|
nd.tspec = nd.trans * m->oargs.farg[5]; |
387 |
greg |
2.6 |
dtmp = nd.trans - nd.tspec; |
388 |
|
|
setcolor(nd.tdiff, dtmp, dtmp, dtmp); |
389 |
|
|
} else { |
390 |
|
|
nd.tspec = nd.trans = 0.0; |
391 |
|
|
setcolor(nd.tdiff, 0.0, 0.0, 0.0); |
392 |
|
|
} |
393 |
|
|
/* compute reflectance */ |
394 |
|
|
dtmp = 1.0 - nd.trans - nd.rspec; |
395 |
|
|
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
396 |
greg |
1.5 |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
397 |
|
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
398 |
greg |
2.6 |
multcolor(nd.rdiff, nd.mcolor); |
399 |
|
|
multcolor(nd.tdiff, nd.mcolor); |
400 |
greg |
1.1 |
/* load auxiliary files */ |
401 |
greg |
2.2 |
if (hasdata(m->otype)) { |
402 |
greg |
1.1 |
nd.dp = getdata(m->oargs.sarg[1]); |
403 |
greg |
2.6 |
getfunc(m, 2, 0, 0); |
404 |
greg |
1.1 |
} else { |
405 |
|
|
nd.dp = NULL; |
406 |
greg |
2.6 |
getfunc(m, 1, 0, 0); |
407 |
greg |
1.1 |
} |
408 |
|
|
/* compute ambient */ |
409 |
greg |
2.6 |
if (nd.trans < 1.0-FTINY) { |
410 |
greg |
2.13 |
ambient(ctmp, r, nd.pnorm); |
411 |
greg |
2.6 |
scalecolor(ctmp, 1.0-nd.trans); |
412 |
greg |
1.1 |
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
413 |
|
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
414 |
greg |
1.5 |
} |
415 |
greg |
2.6 |
if (nd.trans > FTINY) { /* from other side */ |
416 |
greg |
1.5 |
flipsurface(r); |
417 |
greg |
2.14 |
vtmp[0] = -nd.pnorm[0]; |
418 |
|
|
vtmp[1] = -nd.pnorm[1]; |
419 |
|
|
vtmp[2] = -nd.pnorm[2]; |
420 |
|
|
ambient(ctmp, r, vtmp); |
421 |
greg |
2.6 |
scalecolor(ctmp, nd.trans); |
422 |
greg |
1.5 |
multcolor(ctmp, nd.mcolor); |
423 |
|
|
addcolor(r->rcol, ctmp); |
424 |
|
|
flipsurface(r); |
425 |
greg |
1.1 |
} |
426 |
|
|
/* add direct component */ |
427 |
|
|
direct(r, dirbrdf, &nd); |
428 |
greg |
2.10 |
|
429 |
|
|
return(1); |
430 |
greg |
1.10 |
} |
431 |
|
|
|
432 |
|
|
|
433 |
schorsch |
2.21 |
static int |
434 |
|
|
setbrdfunc( /* set up brdf function and variables */ |
435 |
|
|
register BRDFDAT *np |
436 |
|
|
) |
437 |
greg |
1.10 |
{ |
438 |
|
|
FVECT vec; |
439 |
|
|
|
440 |
|
|
if (setfunc(np->mp, np->pr) == 0) |
441 |
|
|
return(0); /* it's OK, setfunc says we're done */ |
442 |
|
|
/* else (re)assign special variables */ |
443 |
|
|
multv3(vec, np->pnorm, funcxf.xfm); |
444 |
|
|
varset("NxP", '=', vec[0]/funcxf.sca); |
445 |
|
|
varset("NyP", '=', vec[1]/funcxf.sca); |
446 |
|
|
varset("NzP", '=', vec[2]/funcxf.sca); |
447 |
greg |
1.11 |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
448 |
|
|
np->pdot >= 1.0 ? 1.0 : np->pdot); |
449 |
greg |
1.10 |
varset("CrP", '=', colval(np->mcolor,RED)); |
450 |
|
|
varset("CgP", '=', colval(np->mcolor,GRN)); |
451 |
|
|
varset("CbP", '=', colval(np->mcolor,BLU)); |
452 |
|
|
return(1); |
453 |
greg |
1.1 |
} |