1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id$"; |
3 |
#endif |
4 |
/* |
5 |
* Routines for light-redirecting materials and |
6 |
* their associated virtual light sources |
7 |
*/ |
8 |
|
9 |
/* ==================================================================== |
10 |
* The Radiance Software License, Version 1.0 |
11 |
* |
12 |
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
13 |
* through Lawrence Berkeley National Laboratory. All rights reserved. |
14 |
* |
15 |
* Redistribution and use in source and binary forms, with or without |
16 |
* modification, are permitted provided that the following conditions |
17 |
* are met: |
18 |
* |
19 |
* 1. Redistributions of source code must retain the above copyright |
20 |
* notice, this list of conditions and the following disclaimer. |
21 |
* |
22 |
* 2. Redistributions in binary form must reproduce the above copyright |
23 |
* notice, this list of conditions and the following disclaimer in |
24 |
* the documentation and/or other materials provided with the |
25 |
* distribution. |
26 |
* |
27 |
* 3. The end-user documentation included with the redistribution, |
28 |
* if any, must include the following acknowledgment: |
29 |
* "This product includes Radiance software |
30 |
* (http://radsite.lbl.gov/) |
31 |
* developed by the Lawrence Berkeley National Laboratory |
32 |
* (http://www.lbl.gov/)." |
33 |
* Alternately, this acknowledgment may appear in the software itself, |
34 |
* if and wherever such third-party acknowledgments normally appear. |
35 |
* |
36 |
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
37 |
* and "The Regents of the University of California" must |
38 |
* not be used to endorse or promote products derived from this |
39 |
* software without prior written permission. For written |
40 |
* permission, please contact [email protected]. |
41 |
* |
42 |
* 5. Products derived from this software may not be called "Radiance", |
43 |
* nor may "Radiance" appear in their name, without prior written |
44 |
* permission of Lawrence Berkeley National Laboratory. |
45 |
* |
46 |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
47 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
48 |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
49 |
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
50 |
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
51 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
52 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
53 |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
54 |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
55 |
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
56 |
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
57 |
* SUCH DAMAGE. |
58 |
* ==================================================================== |
59 |
* |
60 |
* This software consists of voluntary contributions made by many |
61 |
* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
62 |
* information on Lawrence Berkeley National Laboratory, please see |
63 |
* <http://www.lbl.gov/>. |
64 |
*/ |
65 |
|
66 |
#include "ray.h" |
67 |
|
68 |
#include "otypes.h" |
69 |
|
70 |
#include "source.h" |
71 |
|
72 |
#include "func.h" |
73 |
|
74 |
/* |
75 |
* The arguments for MAT_DIRECT1 are: |
76 |
* |
77 |
* 5+ coef1 dx1 dy1 dz1 funcfile transform.. |
78 |
* 0 |
79 |
* n A1 A2 .. An |
80 |
* |
81 |
* The arguments for MAT_DIRECT2 are: |
82 |
* |
83 |
* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform.. |
84 |
* 0 |
85 |
* n A1 A2 .. An |
86 |
*/ |
87 |
|
88 |
|
89 |
static int dir_proj(); |
90 |
|
91 |
VSMATERIAL direct1_vs = {dir_proj, 1}; |
92 |
VSMATERIAL direct2_vs = {dir_proj, 2}; |
93 |
|
94 |
#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \ |
95 |
getfunc(m, 4, 0xf, 1) : \ |
96 |
getfunc(m, 8, 0xff, 1) ) |
97 |
|
98 |
|
99 |
int |
100 |
m_direct(m, r) /* shade redirected ray */ |
101 |
register OBJREC *m; |
102 |
register RAY *r; |
103 |
{ |
104 |
/* check if source ray */ |
105 |
if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
106 |
return(1); /* got the wrong guy */ |
107 |
/* compute first projection */ |
108 |
if (m->otype == MAT_DIRECT1 || |
109 |
(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0)) |
110 |
redirect(m, r, 0); |
111 |
/* compute second projection */ |
112 |
if (m->otype == MAT_DIRECT2 && |
113 |
(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1)) |
114 |
redirect(m, r, 1); |
115 |
return(1); |
116 |
} |
117 |
|
118 |
|
119 |
int |
120 |
redirect(m, r, n) /* compute n'th ray redirection */ |
121 |
OBJREC *m; |
122 |
RAY *r; |
123 |
int n; |
124 |
{ |
125 |
MFUNC *mf; |
126 |
register EPNODE **va; |
127 |
FVECT nsdir; |
128 |
RAY nr; |
129 |
double coef; |
130 |
register int j; |
131 |
/* set up function */ |
132 |
mf = getdfunc(m); |
133 |
setfunc(m, r); |
134 |
/* assign direction variable */ |
135 |
if (r->rsrc >= 0) { |
136 |
register SRCREC *sp = source + source[r->rsrc].sa.sv.sn; |
137 |
|
138 |
if (sp->sflags & SDISTANT) |
139 |
VCOPY(nsdir, sp->sloc); |
140 |
else { |
141 |
for (j = 0; j < 3; j++) |
142 |
nsdir[j] = sp->sloc[j] - r->rop[j]; |
143 |
normalize(nsdir); |
144 |
} |
145 |
multv3(nsdir, nsdir, funcxf.xfm); |
146 |
varset("DxA", '=', nsdir[0]/funcxf.sca); |
147 |
varset("DyA", '=', nsdir[1]/funcxf.sca); |
148 |
varset("DzA", '=', nsdir[2]/funcxf.sca); |
149 |
} else { |
150 |
varset("DxA", '=', 0.0); |
151 |
varset("DyA", '=', 0.0); |
152 |
varset("DzA", '=', 0.0); |
153 |
} |
154 |
/* compute coefficient */ |
155 |
errno = 0; |
156 |
va = mf->ep + 4*n; |
157 |
coef = evalue(va[0]); |
158 |
if (errno) |
159 |
goto computerr; |
160 |
if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0) |
161 |
return(0); |
162 |
va++; /* compute direction */ |
163 |
for (j = 0; j < 3; j++) { |
164 |
nr.rdir[j] = evalue(va[j]); |
165 |
if (errno) |
166 |
goto computerr; |
167 |
} |
168 |
if (mf->f != &unitxf) |
169 |
multv3(nr.rdir, nr.rdir, mf->f->xfm); |
170 |
if (r->rox != NULL) |
171 |
multv3(nr.rdir, nr.rdir, r->rox->f.xfm); |
172 |
if (normalize(nr.rdir) == 0.0) |
173 |
goto computerr; |
174 |
/* compute value */ |
175 |
if (r->rsrc >= 0) |
176 |
nr.rsrc = source[r->rsrc].sa.sv.sn; |
177 |
rayvalue(&nr); |
178 |
scalecolor(nr.rcol, coef); |
179 |
addcolor(r->rcol, nr.rcol); |
180 |
if (r->ro != NULL && isflat(r->ro->otype)) |
181 |
r->rt = r->rot + nr.rt; |
182 |
return(1); |
183 |
computerr: |
184 |
objerror(m, WARNING, "compute error"); |
185 |
return(-1); |
186 |
} |
187 |
|
188 |
|
189 |
static int |
190 |
dir_proj(pm, o, s, n) /* compute a director's projection */ |
191 |
MAT4 pm; |
192 |
OBJREC *o; |
193 |
SRCREC *s; |
194 |
int n; |
195 |
{ |
196 |
RAY tr; |
197 |
OBJREC *m; |
198 |
MFUNC *mf; |
199 |
EPNODE **va; |
200 |
FVECT cent, newdir, nv, h; |
201 |
double coef, olddot, newdot, od; |
202 |
register int i, j; |
203 |
/* initialize test ray */ |
204 |
getmaxdisk(cent, o); |
205 |
if (s->sflags & SDISTANT) |
206 |
for (i = 0; i < 3; i++) { |
207 |
tr.rdir[i] = -s->sloc[i]; |
208 |
tr.rorg[i] = cent[i] - tr.rdir[i]; |
209 |
} |
210 |
else { |
211 |
for (i = 0; i < 3; i++) { |
212 |
tr.rdir[i] = cent[i] - s->sloc[i]; |
213 |
tr.rorg[i] = s->sloc[i]; |
214 |
} |
215 |
if (normalize(tr.rdir) == 0.0) |
216 |
return(0); /* at source! */ |
217 |
} |
218 |
od = getplaneq(nv, o); |
219 |
olddot = DOT(tr.rdir, nv); |
220 |
if (olddot <= FTINY && olddot >= -FTINY) |
221 |
return(0); /* old dir parallels plane */ |
222 |
tr.rmax = 0.0; |
223 |
rayorigin(&tr, NULL, PRIMARY, 1.0); |
224 |
if (!(*ofun[o->otype].funp)(o, &tr)) |
225 |
return(0); /* no intersection! */ |
226 |
/* compute redirection */ |
227 |
m = vsmaterial(o); |
228 |
mf = getdfunc(m); |
229 |
setfunc(m, &tr); |
230 |
varset("DxA", '=', 0.0); |
231 |
varset("DyA", '=', 0.0); |
232 |
varset("DzA", '=', 0.0); |
233 |
errno = 0; |
234 |
va = mf->ep + 4*n; |
235 |
coef = evalue(va[0]); |
236 |
if (errno) |
237 |
goto computerr; |
238 |
if (coef <= FTINY) |
239 |
return(0); /* insignificant */ |
240 |
va++; |
241 |
for (i = 0; i < 3; i++) { |
242 |
newdir[i] = evalue(va[i]); |
243 |
if (errno) |
244 |
goto computerr; |
245 |
} |
246 |
if (mf->f != &unitxf) |
247 |
multv3(newdir, newdir, mf->f->xfm); |
248 |
/* normalization unnecessary */ |
249 |
newdot = DOT(newdir, nv); |
250 |
if (newdot <= FTINY && newdot >= -FTINY) |
251 |
return(0); /* new dir parallels plane */ |
252 |
/* everything OK -- compute shear */ |
253 |
for (i = 0; i < 3; i++) |
254 |
h[i] = newdir[i]/newdot - tr.rdir[i]/olddot; |
255 |
setident4(pm); |
256 |
for (j = 0; j < 3; j++) { |
257 |
for (i = 0; i < 3; i++) |
258 |
pm[i][j] += nv[i]*h[j]; |
259 |
pm[3][j] = -od*h[j]; |
260 |
} |
261 |
if (newdot > 0.0 ^ olddot > 0.0) /* add mirroring */ |
262 |
for (j = 0; j < 3; j++) { |
263 |
for (i = 0; i < 3; i++) |
264 |
pm[i][j] -= 2.*nv[i]*nv[j]; |
265 |
pm[3][j] += 2.*od*nv[j]; |
266 |
} |
267 |
return(1); |
268 |
computerr: |
269 |
objerror(m, WARNING, "projection compute error"); |
270 |
return(0); |
271 |
} |