1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.34 |
static const char RCSid[] = "$Id: mkillum2.c,v 2.33 2009/09/08 23:05:47 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
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/* |
5 |
greg |
1.4 |
* Routines to do the actual calculation for mkillum |
6 |
greg |
1.1 |
*/ |
7 |
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8 |
schorsch |
2.11 |
#include <string.h> |
9 |
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10 |
greg |
1.1 |
#include "mkillum.h" |
11 |
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#include "face.h" |
12 |
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#include "cone.h" |
13 |
greg |
2.25 |
#include "source.h" |
14 |
greg |
1.1 |
|
15 |
greg |
2.31 |
#ifndef NBSDFSAMPS |
16 |
greg |
2.32 |
#define NBSDFSAMPS 256 /* BSDF resampling count */ |
17 |
greg |
2.31 |
#endif |
18 |
greg |
2.13 |
|
19 |
greg |
2.21 |
COLORV * distarr = NULL; /* distribution array */ |
20 |
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int distsiz = 0; |
21 |
greg |
2.29 |
COLORV * direct_discount = NULL; /* amount to take off direct */ |
22 |
greg |
2.16 |
|
23 |
greg |
2.31 |
|
24 |
greg |
2.21 |
void |
25 |
greg |
2.18 |
newdist( /* allocate & clear distribution array */ |
26 |
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int siz |
27 |
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) |
28 |
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{ |
29 |
greg |
2.24 |
if (siz <= 0) { |
30 |
greg |
2.18 |
if (distsiz > 0) |
31 |
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free((void *)distarr); |
32 |
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distarr = NULL; |
33 |
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distsiz = 0; |
34 |
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return; |
35 |
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} |
36 |
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if (distsiz < siz) { |
37 |
greg |
2.21 |
if (distsiz > 0) |
38 |
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free((void *)distarr); |
39 |
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distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
40 |
greg |
2.18 |
if (distarr == NULL) |
41 |
greg |
2.20 |
error(SYSTEM, "out of memory in newdist"); |
42 |
greg |
2.18 |
distsiz = siz; |
43 |
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} |
44 |
greg |
2.21 |
memset(distarr, '\0', sizeof(COLOR)*siz); |
45 |
greg |
2.18 |
} |
46 |
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47 |
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48 |
greg |
2.29 |
static void |
49 |
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new_discount() /* allocate space for direct contrib. record */ |
50 |
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{ |
51 |
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if (distsiz <= 0) |
52 |
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return; |
53 |
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direct_discount = (COLORV *)calloc(distsiz, sizeof(COLOR)); |
54 |
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if (direct_discount == NULL) |
55 |
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error(SYSTEM, "out of memory in new_discount"); |
56 |
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} |
57 |
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58 |
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59 |
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static void |
60 |
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done_discount() /* clear off direct contrib. record */ |
61 |
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{ |
62 |
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if (direct_discount == NULL) |
63 |
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return; |
64 |
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free((void *)direct_discount); |
65 |
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direct_discount = NULL; |
66 |
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} |
67 |
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68 |
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69 |
greg |
2.21 |
int |
70 |
greg |
2.25 |
process_ray( /* process a ray result or report error */ |
71 |
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RAY *r, |
72 |
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int rv |
73 |
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) |
74 |
greg |
2.18 |
{ |
75 |
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COLORV *colp; |
76 |
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|
77 |
greg |
2.24 |
if (rv == 0) /* no result ready */ |
78 |
greg |
2.18 |
return(0); |
79 |
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if (rv < 0) |
80 |
greg |
2.20 |
error(USER, "ray tracing process died"); |
81 |
greg |
2.18 |
if (r->rno >= distsiz) |
82 |
greg |
2.20 |
error(INTERNAL, "bad returned index in process_ray"); |
83 |
greg |
2.25 |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
84 |
greg |
2.18 |
colp = &distarr[r->rno * 3]; |
85 |
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addcolor(colp, r->rcol); |
86 |
greg |
2.29 |
if (r->rsrc >= 0 && /* remember source contrib. */ |
87 |
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direct_discount != NULL) { |
88 |
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colp = &direct_discount[r->rno * 3]; |
89 |
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addcolor(colp, r->rcol); |
90 |
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} |
91 |
greg |
2.18 |
return(1); |
92 |
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} |
93 |
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94 |
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95 |
greg |
2.21 |
void |
96 |
greg |
2.25 |
raysamp( /* queue a ray sample */ |
97 |
greg |
2.18 |
int ndx, |
98 |
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FVECT org, |
99 |
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FVECT dir |
100 |
greg |
2.16 |
) |
101 |
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{ |
102 |
greg |
2.18 |
RAY myRay; |
103 |
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int rv; |
104 |
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105 |
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if ((ndx < 0) | (ndx >= distsiz)) |
106 |
greg |
2.20 |
error(INTERNAL, "bad index in raysamp"); |
107 |
greg |
2.18 |
VCOPY(myRay.rorg, org); |
108 |
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VCOPY(myRay.rdir, dir); |
109 |
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myRay.rmax = .0; |
110 |
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rayorigin(&myRay, PRIMARY, NULL, NULL); |
111 |
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myRay.rno = ndx; |
112 |
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/* queue ray, check result */ |
113 |
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process_ray(&myRay, ray_pqueue(&myRay)); |
114 |
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} |
115 |
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116 |
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117 |
greg |
2.21 |
void |
118 |
greg |
2.25 |
srcsamps( /* sample sources from this surface position */ |
119 |
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struct illum_args *il, |
120 |
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FVECT org, |
121 |
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FVECT nrm, |
122 |
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MAT4 ixfm |
123 |
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) |
124 |
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{ |
125 |
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int nalt, nazi; |
126 |
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SRCINDEX si; |
127 |
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RAY sr; |
128 |
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FVECT v; |
129 |
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double d; |
130 |
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int i, j; |
131 |
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/* get sampling density */ |
132 |
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if (il->sampdens <= 0) { |
133 |
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nalt = nazi = 1; |
134 |
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} else { |
135 |
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i = PI * il->sampdens; |
136 |
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nalt = sqrt(i/PI) + .5; |
137 |
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nazi = PI*nalt + .5; |
138 |
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} |
139 |
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initsrcindex(&si); /* loop over (sub)sources */ |
140 |
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for ( ; ; ) { |
141 |
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VCOPY(sr.rorg, org); /* pick side to shoot from */ |
142 |
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if (il->sd != NULL) { |
143 |
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int sn = si.sn; |
144 |
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if (si.sp+1 >= si.np) ++sn; |
145 |
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if (sn >= nsources) break; |
146 |
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if (source[sn].sflags & SDISTANT) |
147 |
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d = DOT(source[sn].sloc, nrm); |
148 |
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else { |
149 |
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VSUB(v, source[sn].sloc, org); |
150 |
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d = DOT(v, nrm); |
151 |
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} |
152 |
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} else |
153 |
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d = 1.0; /* only transmission */ |
154 |
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if (d < 0.0) |
155 |
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d = -1.0001*il->thick - 5.*FTINY; |
156 |
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else |
157 |
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d = 5.*FTINY; |
158 |
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for (i = 3; i--; ) |
159 |
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sr.rorg[i] += d*nrm[i]; |
160 |
greg |
2.30 |
samplendx++; /* increment sample counter */ |
161 |
greg |
2.25 |
if (!srcray(&sr, NULL, &si)) |
162 |
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break; /* end of sources */ |
163 |
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/* index direction */ |
164 |
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if (ixfm != NULL) |
165 |
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multv3(v, sr.rdir, ixfm); |
166 |
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else |
167 |
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VCOPY(v, sr.rdir); |
168 |
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if (il->sd != NULL) { |
169 |
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i = getBSDF_incndx(il->sd, v); |
170 |
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if (i < 0) |
171 |
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continue; /* must not be important */ |
172 |
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sr.rno = i; |
173 |
greg |
2.26 |
d = 1.0/getBSDF_incohm(il->sd, i); |
174 |
greg |
2.25 |
} else { |
175 |
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if (v[2] >= -FTINY) |
176 |
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continue; /* only sample transmission */ |
177 |
greg |
2.29 |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
178 |
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sr.rno = flatindex(v, nalt, nazi); |
179 |
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d = nalt*nazi*(1./PI) * v[2]; |
180 |
greg |
2.25 |
} |
181 |
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d *= si.dom; /* solid angle correction */ |
182 |
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scalecolor(sr.rcoef, d); |
183 |
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process_ray(&sr, ray_pqueue(&sr)); |
184 |
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} |
185 |
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} |
186 |
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187 |
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188 |
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void |
189 |
greg |
2.18 |
rayclean() /* finish all pending rays */ |
190 |
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{ |
191 |
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RAY myRay; |
192 |
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193 |
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while (process_ray(&myRay, ray_presult(&myRay, 0))) |
194 |
greg |
2.16 |
; |
195 |
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} |
196 |
schorsch |
2.12 |
|
197 |
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198 |
greg |
2.21 |
static void |
199 |
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mkaxes( /* compute u and v to go with n */ |
200 |
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FVECT u, |
201 |
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FVECT v, |
202 |
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FVECT n |
203 |
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) |
204 |
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{ |
205 |
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register int i; |
206 |
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207 |
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v[0] = v[1] = v[2] = 0.0; |
208 |
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for (i = 0; i < 3; i++) |
209 |
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if (n[i] < 0.6 && n[i] > -0.6) |
210 |
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break; |
211 |
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v[i] = 1.0; |
212 |
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fcross(u, v, n); |
213 |
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normalize(u); |
214 |
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fcross(v, n, u); |
215 |
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} |
216 |
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217 |
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218 |
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static void |
219 |
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rounddir( /* compute uniform spherical direction */ |
220 |
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register FVECT dv, |
221 |
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double alt, |
222 |
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double azi |
223 |
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) |
224 |
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{ |
225 |
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double d1, d2; |
226 |
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227 |
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dv[2] = 1. - 2.*alt; |
228 |
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d1 = sqrt(1. - dv[2]*dv[2]); |
229 |
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d2 = 2.*PI * azi; |
230 |
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dv[0] = d1*cos(d2); |
231 |
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dv[1] = d1*sin(d2); |
232 |
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} |
233 |
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234 |
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235 |
greg |
2.24 |
void |
236 |
greg |
2.21 |
flatdir( /* compute uniform hemispherical direction */ |
237 |
greg |
2.24 |
FVECT dv, |
238 |
greg |
2.21 |
double alt, |
239 |
|
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double azi |
240 |
|
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) |
241 |
|
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{ |
242 |
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double d1, d2; |
243 |
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|
244 |
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d1 = sqrt(alt); |
245 |
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d2 = 2.*PI * azi; |
246 |
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dv[0] = d1*cos(d2); |
247 |
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dv[1] = d1*sin(d2); |
248 |
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dv[2] = sqrt(1. - alt); |
249 |
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} |
250 |
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|
251 |
greg |
2.29 |
int |
252 |
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flatindex( /* compute index for hemispherical direction */ |
253 |
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FVECT dv, |
254 |
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int nalt, |
255 |
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int nazi |
256 |
|
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) |
257 |
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{ |
258 |
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double d; |
259 |
|
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int i, j; |
260 |
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261 |
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d = 1.0 - dv[2]*dv[2]; |
262 |
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i = d*nalt; |
263 |
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d = atan2(dv[1], dv[0]) * (0.5/PI); |
264 |
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if (d < 0.0) d += 1.0; |
265 |
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j = d*nazi + 0.5; |
266 |
|
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if (j >= nazi) j = 0; |
267 |
|
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return(i*nazi + j); |
268 |
|
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} |
269 |
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|
270 |
greg |
2.21 |
|
271 |
greg |
2.19 |
int |
272 |
greg |
2.18 |
my_default( /* default illum action */ |
273 |
schorsch |
2.12 |
OBJREC *ob, |
274 |
|
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struct illum_args *il, |
275 |
|
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char *nm |
276 |
|
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) |
277 |
greg |
1.1 |
{ |
278 |
greg |
1.2 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
279 |
|
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nm, ofun[ob->otype].funame, ob->oname); |
280 |
|
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error(WARNING, errmsg); |
281 |
greg |
2.2 |
printobj(il->altmat, ob); |
282 |
greg |
2.13 |
return(1); |
283 |
greg |
1.2 |
} |
284 |
|
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|
285 |
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|
286 |
greg |
2.13 |
int |
287 |
greg |
2.18 |
my_face( /* make an illum face */ |
288 |
schorsch |
2.12 |
OBJREC *ob, |
289 |
|
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struct illum_args *il, |
290 |
|
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char *nm |
291 |
|
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) |
292 |
greg |
1.2 |
{ |
293 |
greg |
2.21 |
int dim[2]; |
294 |
greg |
2.25 |
int n, nalt, nazi, alti; |
295 |
greg |
1.10 |
double sp[2], r1, r2; |
296 |
greg |
2.25 |
int h; |
297 |
greg |
1.4 |
FVECT dn, org, dir; |
298 |
greg |
1.3 |
FVECT u, v; |
299 |
|
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double ur[2], vr[2]; |
300 |
greg |
2.21 |
MAT4 xfm; |
301 |
greg |
2.25 |
int nallow; |
302 |
greg |
2.21 |
FACE *fa; |
303 |
greg |
2.25 |
int i, j; |
304 |
greg |
1.3 |
/* get/check arguments */ |
305 |
|
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fa = getface(ob); |
306 |
|
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if (fa->area == 0.0) { |
307 |
|
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freeface(ob); |
308 |
greg |
2.19 |
return(my_default(ob, il, nm)); |
309 |
greg |
1.3 |
} |
310 |
|
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/* set up sampling */ |
311 |
greg |
2.21 |
if (il->sd != NULL) { |
312 |
|
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if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
313 |
|
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objerror(ob, WARNING, "illegal up direction"); |
314 |
|
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freeface(ob); |
315 |
|
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return(my_default(ob, il, nm)); |
316 |
|
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} |
317 |
|
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n = il->sd->ninc; |
318 |
greg |
2.22 |
} else { |
319 |
|
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if (il->sampdens <= 0) { |
320 |
|
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nalt = nazi = 1; /* diffuse assumption */ |
321 |
|
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} else { |
322 |
|
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n = PI * il->sampdens; |
323 |
|
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nalt = sqrt(n/PI) + .5; |
324 |
|
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nazi = PI*nalt + .5; |
325 |
|
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} |
326 |
greg |
2.21 |
n = nazi*nalt; |
327 |
greg |
2.22 |
} |
328 |
greg |
2.18 |
newdist(n); |
329 |
greg |
2.20 |
/* take first edge >= sqrt(area) */ |
330 |
greg |
2.4 |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
331 |
|
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u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
332 |
|
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
333 |
|
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u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
334 |
greg |
2.5 |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
335 |
greg |
2.3 |
break; |
336 |
|
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} |
337 |
|
|
if (i < fa->nv) { /* got one! -- let's align our axes */ |
338 |
greg |
2.5 |
r2 = 1.0/sqrt(r1); |
339 |
|
|
u[0] *= r2; u[1] *= r2; u[2] *= r2; |
340 |
greg |
2.3 |
fcross(v, fa->norm, u); |
341 |
|
|
} else /* oh well, we'll just have to wing it */ |
342 |
|
|
mkaxes(u, v, fa->norm); |
343 |
|
|
/* now, find limits in (u,v) coordinates */ |
344 |
greg |
1.3 |
ur[0] = vr[0] = FHUGE; |
345 |
|
|
ur[1] = vr[1] = -FHUGE; |
346 |
|
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for (i = 0; i < fa->nv; i++) { |
347 |
|
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r1 = DOT(VERTEX(fa,i),u); |
348 |
|
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if (r1 < ur[0]) ur[0] = r1; |
349 |
|
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if (r1 > ur[1]) ur[1] = r1; |
350 |
|
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r2 = DOT(VERTEX(fa,i),v); |
351 |
|
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if (r2 < vr[0]) vr[0] = r2; |
352 |
|
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if (r2 > vr[1]) vr[1] = r2; |
353 |
|
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} |
354 |
|
|
dim[0] = random(); |
355 |
|
|
/* sample polygon */ |
356 |
greg |
2.25 |
nallow = 5*n*il->nsamps; |
357 |
greg |
2.21 |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
358 |
greg |
1.3 |
for (i = 0; i < il->nsamps; i++) { |
359 |
greg |
2.23 |
/* randomize direction */ |
360 |
greg |
2.21 |
h = ilhash(dim, 2) + i; |
361 |
|
|
if (il->sd != NULL) { |
362 |
|
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
363 |
|
|
} else { |
364 |
|
|
multisamp(sp, 2, urand(h)); |
365 |
|
|
alti = dim[1]/nazi; |
366 |
|
|
r1 = (alti + sp[0])/nalt; |
367 |
|
|
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
368 |
|
|
flatdir(dn, r1, r2); |
369 |
|
|
for (j = 0; j < 3; j++) |
370 |
|
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
371 |
|
|
dn[2]*fa->norm[j]; |
372 |
|
|
} |
373 |
greg |
2.23 |
/* randomize location */ |
374 |
greg |
1.3 |
do { |
375 |
greg |
2.25 |
multisamp(sp, 2, urand(h+4862+nallow)); |
376 |
greg |
1.10 |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
377 |
|
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
378 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
379 |
|
|
org[j] = r1*u[j] + r2*v[j] |
380 |
|
|
+ fa->offset*fa->norm[j]; |
381 |
greg |
2.25 |
} while (!inface(org, fa) && nallow-- > 0); |
382 |
|
|
if (nallow < 0) { |
383 |
greg |
1.3 |
objerror(ob, WARNING, "bad aspect"); |
384 |
greg |
2.18 |
rayclean(); |
385 |
greg |
1.3 |
freeface(ob); |
386 |
greg |
2.19 |
return(my_default(ob, il, nm)); |
387 |
greg |
1.3 |
} |
388 |
greg |
2.21 |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
389 |
greg |
2.25 |
r1 = -1.0001*il->thick - 5.*FTINY; |
390 |
greg |
2.21 |
else |
391 |
greg |
2.25 |
r1 = 5.*FTINY; |
392 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
393 |
greg |
2.21 |
org[j] += r1*fa->norm[j]; |
394 |
greg |
1.3 |
/* send sample */ |
395 |
greg |
2.21 |
raysamp(dim[1], org, dir); |
396 |
greg |
1.3 |
} |
397 |
greg |
2.25 |
/* add in direct component? */ |
398 |
greg |
2.29 |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
399 |
greg |
2.25 |
MAT4 ixfm; |
400 |
|
|
if (il->sd == NULL) { |
401 |
|
|
for (i = 3; i--; ) { |
402 |
|
|
ixfm[i][0] = u[i]; |
403 |
|
|
ixfm[i][1] = v[i]; |
404 |
|
|
ixfm[i][2] = fa->norm[i]; |
405 |
|
|
ixfm[i][3] = 0.; |
406 |
|
|
} |
407 |
|
|
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
408 |
|
|
ixfm[3][3] = 1.; |
409 |
greg |
2.29 |
} else { |
410 |
|
|
if (!invmat4(ixfm, xfm)) |
411 |
|
|
objerror(ob, INTERNAL, |
412 |
|
|
"cannot invert BSDF transform"); |
413 |
|
|
if (!(il->flags & IL_LIGHT)) |
414 |
|
|
new_discount(); |
415 |
|
|
} |
416 |
greg |
2.25 |
dim[0] = random(); |
417 |
|
|
nallow = 10*il->nsamps; |
418 |
|
|
for (i = 0; i < il->nsamps; i++) { |
419 |
|
|
/* randomize location */ |
420 |
|
|
h = dim[0] + samplendx++; |
421 |
|
|
do { |
422 |
|
|
multisamp(sp, 2, urand(h+nallow)); |
423 |
|
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
424 |
|
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
425 |
|
|
for (j = 0; j < 3; j++) |
426 |
|
|
org[j] = r1*u[j] + r2*v[j] |
427 |
|
|
+ fa->offset*fa->norm[j]; |
428 |
|
|
} while (!inface(org, fa) && nallow-- > 0); |
429 |
|
|
if (nallow < 0) { |
430 |
|
|
objerror(ob, WARNING, "bad aspect"); |
431 |
|
|
rayclean(); |
432 |
|
|
freeface(ob); |
433 |
|
|
return(my_default(ob, il, nm)); |
434 |
|
|
} |
435 |
|
|
/* sample source rays */ |
436 |
|
|
srcsamps(il, org, fa->norm, ixfm); |
437 |
|
|
} |
438 |
|
|
} |
439 |
|
|
/* wait for all rays to finish */ |
440 |
greg |
2.18 |
rayclean(); |
441 |
greg |
2.22 |
if (il->sd != NULL) { /* run distribution through BSDF */ |
442 |
|
|
nalt = sqrt(il->sd->nout/PI) + .5; |
443 |
|
|
nazi = PI*nalt + .5; |
444 |
greg |
2.21 |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
445 |
greg |
2.29 |
done_discount(); |
446 |
greg |
2.28 |
if (!il->sampdens) |
447 |
|
|
il->sampdens = nalt*nazi/PI + .999; |
448 |
greg |
2.22 |
} |
449 |
greg |
1.11 |
/* write out the face and its distribution */ |
450 |
greg |
2.21 |
if (average(il, distarr, n)) { |
451 |
greg |
1.12 |
if (il->sampdens > 0) |
452 |
|
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
453 |
|
|
illumout(il, ob); |
454 |
greg |
2.2 |
} else |
455 |
greg |
1.12 |
printobj(il->altmat, ob); |
456 |
greg |
1.3 |
/* clean up */ |
457 |
|
|
freeface(ob); |
458 |
greg |
2.15 |
return(0); |
459 |
greg |
1.2 |
} |
460 |
|
|
|
461 |
|
|
|
462 |
greg |
2.13 |
int |
463 |
greg |
2.18 |
my_sphere( /* make an illum sphere */ |
464 |
schorsch |
2.12 |
register OBJREC *ob, |
465 |
|
|
struct illum_args *il, |
466 |
|
|
char *nm |
467 |
|
|
) |
468 |
greg |
1.2 |
{ |
469 |
greg |
1.10 |
int dim[3]; |
470 |
greg |
1.2 |
int n, nalt, nazi; |
471 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
472 |
greg |
1.4 |
FVECT org, dir; |
473 |
greg |
1.2 |
FVECT u, v; |
474 |
|
|
register int i, j; |
475 |
|
|
/* check arguments */ |
476 |
|
|
if (ob->oargs.nfargs != 4) |
477 |
|
|
objerror(ob, USER, "bad # of arguments"); |
478 |
|
|
/* set up sampling */ |
479 |
greg |
1.11 |
if (il->sampdens <= 0) |
480 |
|
|
nalt = nazi = 1; |
481 |
|
|
else { |
482 |
|
|
n = 4.*PI * il->sampdens; |
483 |
greg |
2.7 |
nalt = sqrt(2./PI*n) + .5; |
484 |
|
|
nazi = PI/2.*nalt + .5; |
485 |
greg |
1.11 |
} |
486 |
greg |
2.21 |
if (il->sd != NULL) |
487 |
|
|
objerror(ob, WARNING, "BSDF ignored"); |
488 |
greg |
1.2 |
n = nalt*nazi; |
489 |
greg |
2.18 |
newdist(n); |
490 |
greg |
1.2 |
dim[0] = random(); |
491 |
|
|
/* sample sphere */ |
492 |
|
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
493 |
greg |
1.8 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
494 |
greg |
1.2 |
for (i = 0; i < il->nsamps; i++) { |
495 |
greg |
1.10 |
/* next sample point */ |
496 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
497 |
greg |
1.2 |
/* random direction */ |
498 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
499 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
500 |
greg |
1.2 |
rounddir(dir, r1, r2); |
501 |
|
|
/* random location */ |
502 |
greg |
1.8 |
mkaxes(u, v, dir); /* yuck! */ |
503 |
greg |
1.10 |
r3 = sqrt(sp[2]); |
504 |
|
|
r2 = 2.*PI*sp[3]; |
505 |
greg |
1.5 |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
506 |
|
|
r2 = r3*ob->oargs.farg[3]*sin(r2); |
507 |
|
|
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
508 |
|
|
for (j = 0; j < 3; j++) { |
509 |
|
|
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
510 |
|
|
r3*dir[j]; |
511 |
|
|
dir[j] = -dir[j]; |
512 |
|
|
} |
513 |
greg |
1.2 |
/* send sample */ |
514 |
greg |
2.18 |
raysamp(dim[1]*nazi+dim[2], org, dir); |
515 |
greg |
1.2 |
} |
516 |
greg |
2.25 |
/* wait for all rays to finish */ |
517 |
greg |
2.18 |
rayclean(); |
518 |
greg |
1.11 |
/* write out the sphere and its distribution */ |
519 |
greg |
2.21 |
if (average(il, distarr, n)) { |
520 |
greg |
1.12 |
if (il->sampdens > 0) |
521 |
|
|
roundout(il, distarr, nalt, nazi); |
522 |
|
|
else |
523 |
|
|
objerror(ob, WARNING, "diffuse distribution"); |
524 |
|
|
illumout(il, ob); |
525 |
greg |
2.2 |
} else |
526 |
greg |
1.12 |
printobj(il->altmat, ob); |
527 |
greg |
1.2 |
/* clean up */ |
528 |
greg |
2.13 |
return(1); |
529 |
greg |
1.2 |
} |
530 |
|
|
|
531 |
|
|
|
532 |
greg |
2.13 |
int |
533 |
greg |
2.18 |
my_ring( /* make an illum ring */ |
534 |
schorsch |
2.12 |
OBJREC *ob, |
535 |
|
|
struct illum_args *il, |
536 |
|
|
char *nm |
537 |
|
|
) |
538 |
greg |
1.2 |
{ |
539 |
greg |
2.21 |
int dim[2]; |
540 |
|
|
int n, nalt, nazi, alti; |
541 |
|
|
double sp[2], r1, r2, r3; |
542 |
|
|
int h; |
543 |
greg |
1.4 |
FVECT dn, org, dir; |
544 |
greg |
1.3 |
FVECT u, v; |
545 |
greg |
2.21 |
MAT4 xfm; |
546 |
|
|
CONE *co; |
547 |
greg |
2.25 |
int i, j; |
548 |
greg |
1.3 |
/* get/check arguments */ |
549 |
|
|
co = getcone(ob, 0); |
550 |
|
|
/* set up sampling */ |
551 |
greg |
2.21 |
if (il->sd != NULL) { |
552 |
|
|
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
553 |
|
|
objerror(ob, WARNING, "illegal up direction"); |
554 |
|
|
freecone(ob); |
555 |
|
|
return(my_default(ob, il, nm)); |
556 |
|
|
} |
557 |
|
|
n = il->sd->ninc; |
558 |
greg |
2.22 |
} else { |
559 |
|
|
if (il->sampdens <= 0) { |
560 |
|
|
nalt = nazi = 1; /* diffuse assumption */ |
561 |
|
|
} else { |
562 |
|
|
n = PI * il->sampdens; |
563 |
|
|
nalt = sqrt(n/PI) + .5; |
564 |
|
|
nazi = PI*nalt + .5; |
565 |
|
|
} |
566 |
greg |
2.21 |
n = nazi*nalt; |
567 |
greg |
2.22 |
} |
568 |
greg |
2.18 |
newdist(n); |
569 |
greg |
1.3 |
mkaxes(u, v, co->ad); |
570 |
|
|
dim[0] = random(); |
571 |
|
|
/* sample disk */ |
572 |
greg |
2.21 |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
573 |
greg |
1.3 |
for (i = 0; i < il->nsamps; i++) { |
574 |
greg |
1.10 |
/* next sample point */ |
575 |
greg |
2.21 |
h = ilhash(dim,2) + i; |
576 |
greg |
2.23 |
/* randomize direction */ |
577 |
greg |
2.21 |
if (il->sd != NULL) { |
578 |
|
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
579 |
|
|
} else { |
580 |
|
|
multisamp(sp, 2, urand(h)); |
581 |
|
|
alti = dim[1]/nazi; |
582 |
|
|
r1 = (alti + sp[0])/nalt; |
583 |
|
|
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
584 |
|
|
flatdir(dn, r1, r2); |
585 |
|
|
for (j = 0; j < 3; j++) |
586 |
greg |
2.24 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
587 |
greg |
2.21 |
} |
588 |
greg |
2.23 |
/* randomize location */ |
589 |
greg |
2.21 |
multisamp(sp, 2, urand(h+8371)); |
590 |
greg |
1.5 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
591 |
greg |
2.21 |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
592 |
|
|
r2 = 2.*PI*sp[1]; |
593 |
greg |
1.5 |
r1 = r3*cos(r2); |
594 |
|
|
r2 = r3*sin(r2); |
595 |
greg |
2.21 |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
596 |
greg |
2.25 |
r3 = -1.0001*il->thick - 5.*FTINY; |
597 |
greg |
2.21 |
else |
598 |
greg |
2.25 |
r3 = 5.*FTINY; |
599 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
600 |
greg |
2.6 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
601 |
greg |
2.21 |
r3*co->ad[j]; |
602 |
greg |
1.3 |
/* send sample */ |
603 |
greg |
2.21 |
raysamp(dim[1], org, dir); |
604 |
greg |
1.3 |
} |
605 |
greg |
2.25 |
/* add in direct component? */ |
606 |
greg |
2.29 |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
607 |
greg |
2.25 |
MAT4 ixfm; |
608 |
|
|
if (il->sd == NULL) { |
609 |
|
|
for (i = 3; i--; ) { |
610 |
|
|
ixfm[i][0] = u[i]; |
611 |
|
|
ixfm[i][1] = v[i]; |
612 |
|
|
ixfm[i][2] = co->ad[i]; |
613 |
|
|
ixfm[i][3] = 0.; |
614 |
|
|
} |
615 |
|
|
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
616 |
|
|
ixfm[3][3] = 1.; |
617 |
greg |
2.29 |
} else { |
618 |
|
|
if (!invmat4(ixfm, xfm)) |
619 |
|
|
objerror(ob, INTERNAL, |
620 |
|
|
"cannot invert BSDF transform"); |
621 |
|
|
if (!(il->flags & IL_LIGHT)) |
622 |
|
|
new_discount(); |
623 |
|
|
} |
624 |
greg |
2.25 |
dim[0] = random(); |
625 |
|
|
for (i = 0; i < il->nsamps; i++) { |
626 |
|
|
/* randomize location */ |
627 |
|
|
h = dim[0] + samplendx++; |
628 |
|
|
multisamp(sp, 2, urand(h)); |
629 |
|
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
630 |
|
|
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
631 |
|
|
r2 = 2.*PI*sp[1]; |
632 |
|
|
r1 = r3*cos(r2); |
633 |
|
|
r2 = r3*sin(r2); |
634 |
|
|
for (j = 0; j < 3; j++) |
635 |
|
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
636 |
|
|
/* sample source rays */ |
637 |
|
|
srcsamps(il, org, co->ad, ixfm); |
638 |
|
|
} |
639 |
|
|
} |
640 |
|
|
/* wait for all rays to finish */ |
641 |
greg |
2.18 |
rayclean(); |
642 |
greg |
2.22 |
if (il->sd != NULL) { /* run distribution through BSDF */ |
643 |
|
|
nalt = sqrt(il->sd->nout/PI) + .5; |
644 |
|
|
nazi = PI*nalt + .5; |
645 |
greg |
2.21 |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
646 |
greg |
2.29 |
done_discount(); |
647 |
greg |
2.28 |
if (!il->sampdens) |
648 |
|
|
il->sampdens = nalt*nazi/PI + .999; |
649 |
greg |
2.22 |
} |
650 |
greg |
1.11 |
/* write out the ring and its distribution */ |
651 |
greg |
2.21 |
if (average(il, distarr, n)) { |
652 |
greg |
1.12 |
if (il->sampdens > 0) |
653 |
|
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
654 |
|
|
illumout(il, ob); |
655 |
greg |
2.2 |
} else |
656 |
greg |
1.12 |
printobj(il->altmat, ob); |
657 |
greg |
1.3 |
/* clean up */ |
658 |
|
|
freecone(ob); |
659 |
greg |
2.13 |
return(1); |
660 |
greg |
1.2 |
} |
661 |
greg |
2.31 |
|
662 |
|
|
|
663 |
|
|
void |
664 |
|
|
redistribute( /* pass distarr ray sums through BSDF */ |
665 |
|
|
struct BSDF_data *b, |
666 |
|
|
int nalt, |
667 |
|
|
int nazi, |
668 |
|
|
FVECT u, |
669 |
|
|
FVECT v, |
670 |
|
|
FVECT w, |
671 |
|
|
MAT4 xm |
672 |
|
|
) |
673 |
|
|
{ |
674 |
|
|
int nout = 0; |
675 |
|
|
MAT4 mymat, inmat; |
676 |
|
|
COLORV *idist; |
677 |
|
|
COLORV *cp; |
678 |
|
|
FVECT dv; |
679 |
|
|
double wt; |
680 |
|
|
int i, j, k, c, o; |
681 |
|
|
COLOR col, cinc; |
682 |
|
|
/* copy incoming distribution */ |
683 |
|
|
if (b->ninc > distsiz) |
684 |
|
|
error(INTERNAL, "error 1 in redistribute"); |
685 |
|
|
idist = (COLORV *)malloc(sizeof(COLOR)*b->ninc); |
686 |
|
|
if (idist == NULL) |
687 |
|
|
error(SYSTEM, "out of memory in redistribute"); |
688 |
|
|
memcpy(idist, distarr, sizeof(COLOR)*b->ninc); |
689 |
|
|
/* compose direction transform */ |
690 |
|
|
for (i = 3; i--; ) { |
691 |
|
|
mymat[i][0] = u[i]; |
692 |
|
|
mymat[i][1] = v[i]; |
693 |
|
|
mymat[i][2] = w[i]; |
694 |
|
|
mymat[i][3] = 0.; |
695 |
|
|
} |
696 |
|
|
mymat[3][0] = mymat[3][1] = mymat[3][2] = 0.; |
697 |
|
|
mymat[3][3] = 1.; |
698 |
|
|
if (xm != NULL) |
699 |
|
|
multmat4(mymat, xm, mymat); |
700 |
|
|
for (i = 3; i--; ) { /* make sure it's normalized */ |
701 |
|
|
wt = 1./sqrt( mymat[0][i]*mymat[0][i] + |
702 |
|
|
mymat[1][i]*mymat[1][i] + |
703 |
|
|
mymat[2][i]*mymat[2][i] ); |
704 |
|
|
for (j = 3; j--; ) |
705 |
|
|
mymat[j][i] *= wt; |
706 |
|
|
} |
707 |
|
|
if (!invmat4(inmat, mymat)) /* need inverse as well */ |
708 |
|
|
error(INTERNAL, "cannot invert BSDF transform"); |
709 |
|
|
newdist(nalt*nazi); /* resample distribution */ |
710 |
|
|
for (i = b->ninc; i--; ) { |
711 |
|
|
int direct_out = -1; |
712 |
|
|
COLOR cdir; |
713 |
|
|
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
714 |
|
|
multv3(dv, dv, mymat); |
715 |
|
|
if (dv[2] < 0.0) { |
716 |
|
|
dv[0] = -dv[0]; dv[1] = -dv[1]; dv[2] = -dv[2]; |
717 |
|
|
direct_out += (direct_discount != NULL); |
718 |
|
|
} |
719 |
|
|
wt = getBSDF_incohm(b, i); |
720 |
|
|
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
721 |
|
|
cp = &idist[3*i]; |
722 |
|
|
copycolor(cinc, cp); |
723 |
|
|
scalecolor(cinc, wt); |
724 |
|
|
if (!direct_out) { /* discount direct contr. */ |
725 |
|
|
cp = &direct_discount[3*i]; |
726 |
|
|
copycolor(cdir, cp); |
727 |
|
|
scalecolor(cdir, -wt); |
728 |
greg |
2.33 |
if (b->nout != b->ninc) |
729 |
|
|
direct_out = flatindex(dv, nalt, nazi); |
730 |
|
|
else |
731 |
|
|
direct_out = i; /* assumes dist. mirroring */ |
732 |
greg |
2.31 |
} |
733 |
|
|
for (k = nalt; k--; ) /* loop over distribution */ |
734 |
|
|
for (j = nazi; j--; ) { |
735 |
|
|
int rstart = random(); |
736 |
|
|
for (c = NBSDFSAMPS; c--; ) { |
737 |
|
|
double sp[2]; |
738 |
|
|
multisamp(sp, 2, urand(rstart+c)); |
739 |
|
|
flatdir(dv, (k + sp[0])/nalt, |
740 |
|
|
(j + .5 - sp[1])/nazi); |
741 |
|
|
multv3(dv, dv, inmat); |
742 |
|
|
/* evaluate BSDF @ outgoing */ |
743 |
|
|
o = getBSDF_outndx(b, dv); |
744 |
|
|
if (o < 0) { |
745 |
|
|
nout++; |
746 |
|
|
continue; |
747 |
|
|
} |
748 |
|
|
wt = BSDF_value(b, i, o) * (1./NBSDFSAMPS); |
749 |
|
|
copycolor(col, cinc); |
750 |
greg |
2.33 |
if (b->nout != b->ninc) |
751 |
|
|
o = k*nazi + j; |
752 |
greg |
2.31 |
if (o == direct_out) |
753 |
|
|
addcolor(col, cdir); /* minus direct */ |
754 |
|
|
scalecolor(col, wt); |
755 |
greg |
2.34 |
cp = &distarr[3*(k*nazi + j)]; |
756 |
greg |
2.31 |
addcolor(cp, col); /* sum into distribution */ |
757 |
|
|
} |
758 |
|
|
} |
759 |
|
|
} |
760 |
|
|
free(idist); /* free temp space */ |
761 |
|
|
if (nout) { |
762 |
|
|
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
763 |
|
|
100.*nout/(b->ninc*nalt*nazi*NBSDFSAMPS)); |
764 |
|
|
error(WARNING, errmsg); |
765 |
|
|
} |
766 |
|
|
} |