1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.29 |
static const char RCSid[] = "$Id: mkillum2.c,v 2.28 2007/12/13 07:03:37 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 |
2.13 |
|
16 |
greg |
2.21 |
COLORV * distarr = NULL; /* distribution array */ |
17 |
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int distsiz = 0; |
18 |
greg |
2.29 |
COLORV * direct_discount = NULL; /* amount to take off direct */ |
19 |
greg |
2.16 |
|
20 |
greg |
2.21 |
void |
21 |
greg |
2.18 |
newdist( /* allocate & clear distribution array */ |
22 |
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int siz |
23 |
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) |
24 |
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{ |
25 |
greg |
2.24 |
if (siz <= 0) { |
26 |
greg |
2.18 |
if (distsiz > 0) |
27 |
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free((void *)distarr); |
28 |
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distarr = NULL; |
29 |
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distsiz = 0; |
30 |
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return; |
31 |
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} |
32 |
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if (distsiz < siz) { |
33 |
greg |
2.21 |
if (distsiz > 0) |
34 |
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free((void *)distarr); |
35 |
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distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
36 |
greg |
2.18 |
if (distarr == NULL) |
37 |
greg |
2.20 |
error(SYSTEM, "out of memory in newdist"); |
38 |
greg |
2.18 |
distsiz = siz; |
39 |
|
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} |
40 |
greg |
2.21 |
memset(distarr, '\0', sizeof(COLOR)*siz); |
41 |
greg |
2.18 |
} |
42 |
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43 |
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44 |
greg |
2.29 |
static void |
45 |
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new_discount() /* allocate space for direct contrib. record */ |
46 |
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{ |
47 |
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if (distsiz <= 0) |
48 |
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return; |
49 |
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direct_discount = (COLORV *)calloc(distsiz, sizeof(COLOR)); |
50 |
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if (direct_discount == NULL) |
51 |
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error(SYSTEM, "out of memory in new_discount"); |
52 |
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} |
53 |
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54 |
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55 |
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static void |
56 |
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done_discount() /* clear off direct contrib. record */ |
57 |
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{ |
58 |
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if (direct_discount == NULL) |
59 |
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return; |
60 |
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free((void *)direct_discount); |
61 |
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direct_discount = NULL; |
62 |
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} |
63 |
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64 |
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65 |
greg |
2.21 |
int |
66 |
greg |
2.25 |
process_ray( /* process a ray result or report error */ |
67 |
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RAY *r, |
68 |
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int rv |
69 |
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) |
70 |
greg |
2.18 |
{ |
71 |
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COLORV *colp; |
72 |
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|
73 |
greg |
2.24 |
if (rv == 0) /* no result ready */ |
74 |
greg |
2.18 |
return(0); |
75 |
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if (rv < 0) |
76 |
greg |
2.20 |
error(USER, "ray tracing process died"); |
77 |
greg |
2.18 |
if (r->rno >= distsiz) |
78 |
greg |
2.20 |
error(INTERNAL, "bad returned index in process_ray"); |
79 |
greg |
2.25 |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
80 |
greg |
2.18 |
colp = &distarr[r->rno * 3]; |
81 |
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addcolor(colp, r->rcol); |
82 |
greg |
2.29 |
if (r->rsrc >= 0 && /* remember source contrib. */ |
83 |
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direct_discount != NULL) { |
84 |
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colp = &direct_discount[r->rno * 3]; |
85 |
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addcolor(colp, r->rcol); |
86 |
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} |
87 |
greg |
2.18 |
return(1); |
88 |
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} |
89 |
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90 |
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91 |
greg |
2.21 |
void |
92 |
greg |
2.25 |
raysamp( /* queue a ray sample */ |
93 |
greg |
2.18 |
int ndx, |
94 |
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FVECT org, |
95 |
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FVECT dir |
96 |
greg |
2.16 |
) |
97 |
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{ |
98 |
greg |
2.18 |
RAY myRay; |
99 |
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int rv; |
100 |
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101 |
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if ((ndx < 0) | (ndx >= distsiz)) |
102 |
greg |
2.20 |
error(INTERNAL, "bad index in raysamp"); |
103 |
greg |
2.18 |
VCOPY(myRay.rorg, org); |
104 |
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VCOPY(myRay.rdir, dir); |
105 |
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myRay.rmax = .0; |
106 |
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rayorigin(&myRay, PRIMARY, NULL, NULL); |
107 |
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myRay.rno = ndx; |
108 |
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/* queue ray, check result */ |
109 |
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process_ray(&myRay, ray_pqueue(&myRay)); |
110 |
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} |
111 |
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112 |
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113 |
greg |
2.21 |
void |
114 |
greg |
2.25 |
srcsamps( /* sample sources from this surface position */ |
115 |
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struct illum_args *il, |
116 |
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FVECT org, |
117 |
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FVECT nrm, |
118 |
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MAT4 ixfm |
119 |
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) |
120 |
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{ |
121 |
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int nalt, nazi; |
122 |
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SRCINDEX si; |
123 |
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RAY sr; |
124 |
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FVECT v; |
125 |
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double d; |
126 |
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int i, j; |
127 |
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/* get sampling density */ |
128 |
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if (il->sampdens <= 0) { |
129 |
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nalt = nazi = 1; |
130 |
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} else { |
131 |
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i = PI * il->sampdens; |
132 |
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nalt = sqrt(i/PI) + .5; |
133 |
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nazi = PI*nalt + .5; |
134 |
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} |
135 |
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initsrcindex(&si); /* loop over (sub)sources */ |
136 |
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for ( ; ; ) { |
137 |
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VCOPY(sr.rorg, org); /* pick side to shoot from */ |
138 |
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if (il->sd != NULL) { |
139 |
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int sn = si.sn; |
140 |
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if (si.sp+1 >= si.np) ++sn; |
141 |
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if (sn >= nsources) break; |
142 |
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if (source[sn].sflags & SDISTANT) |
143 |
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d = DOT(source[sn].sloc, nrm); |
144 |
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else { |
145 |
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VSUB(v, source[sn].sloc, org); |
146 |
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d = DOT(v, nrm); |
147 |
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} |
148 |
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} else |
149 |
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d = 1.0; /* only transmission */ |
150 |
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if (d < 0.0) |
151 |
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d = -1.0001*il->thick - 5.*FTINY; |
152 |
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else |
153 |
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d = 5.*FTINY; |
154 |
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for (i = 3; i--; ) |
155 |
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sr.rorg[i] += d*nrm[i]; |
156 |
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if (!srcray(&sr, NULL, &si)) |
157 |
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break; /* end of sources */ |
158 |
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/* index direction */ |
159 |
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if (ixfm != NULL) |
160 |
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multv3(v, sr.rdir, ixfm); |
161 |
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else |
162 |
|
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VCOPY(v, sr.rdir); |
163 |
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if (il->sd != NULL) { |
164 |
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i = getBSDF_incndx(il->sd, v); |
165 |
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if (i < 0) |
166 |
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continue; /* must not be important */ |
167 |
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sr.rno = i; |
168 |
greg |
2.26 |
d = 1.0/getBSDF_incohm(il->sd, i); |
169 |
greg |
2.25 |
} else { |
170 |
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if (v[2] >= -FTINY) |
171 |
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continue; /* only sample transmission */ |
172 |
greg |
2.29 |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
173 |
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sr.rno = flatindex(v, nalt, nazi); |
174 |
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d = nalt*nazi*(1./PI) * v[2]; |
175 |
greg |
2.25 |
} |
176 |
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d *= si.dom; /* solid angle correction */ |
177 |
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scalecolor(sr.rcoef, d); |
178 |
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process_ray(&sr, ray_pqueue(&sr)); |
179 |
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} |
180 |
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} |
181 |
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182 |
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183 |
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void |
184 |
greg |
2.18 |
rayclean() /* finish all pending rays */ |
185 |
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{ |
186 |
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RAY myRay; |
187 |
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|
188 |
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while (process_ray(&myRay, ray_presult(&myRay, 0))) |
189 |
greg |
2.16 |
; |
190 |
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} |
191 |
schorsch |
2.12 |
|
192 |
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193 |
greg |
2.21 |
static void |
194 |
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mkaxes( /* compute u and v to go with n */ |
195 |
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FVECT u, |
196 |
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FVECT v, |
197 |
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FVECT n |
198 |
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) |
199 |
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{ |
200 |
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register int i; |
201 |
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202 |
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v[0] = v[1] = v[2] = 0.0; |
203 |
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for (i = 0; i < 3; i++) |
204 |
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if (n[i] < 0.6 && n[i] > -0.6) |
205 |
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break; |
206 |
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v[i] = 1.0; |
207 |
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fcross(u, v, n); |
208 |
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normalize(u); |
209 |
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fcross(v, n, u); |
210 |
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} |
211 |
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212 |
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213 |
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static void |
214 |
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rounddir( /* compute uniform spherical direction */ |
215 |
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register FVECT dv, |
216 |
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double alt, |
217 |
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double azi |
218 |
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) |
219 |
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{ |
220 |
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double d1, d2; |
221 |
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222 |
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dv[2] = 1. - 2.*alt; |
223 |
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d1 = sqrt(1. - dv[2]*dv[2]); |
224 |
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d2 = 2.*PI * azi; |
225 |
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dv[0] = d1*cos(d2); |
226 |
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dv[1] = d1*sin(d2); |
227 |
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} |
228 |
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229 |
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230 |
greg |
2.24 |
void |
231 |
greg |
2.21 |
flatdir( /* compute uniform hemispherical direction */ |
232 |
greg |
2.24 |
FVECT dv, |
233 |
greg |
2.21 |
double alt, |
234 |
|
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double azi |
235 |
|
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) |
236 |
|
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{ |
237 |
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double d1, d2; |
238 |
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|
239 |
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d1 = sqrt(alt); |
240 |
|
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d2 = 2.*PI * azi; |
241 |
|
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dv[0] = d1*cos(d2); |
242 |
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dv[1] = d1*sin(d2); |
243 |
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dv[2] = sqrt(1. - alt); |
244 |
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} |
245 |
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246 |
greg |
2.29 |
int |
247 |
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flatindex( /* compute index for hemispherical direction */ |
248 |
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FVECT dv, |
249 |
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int nalt, |
250 |
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int nazi |
251 |
|
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) |
252 |
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{ |
253 |
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double d; |
254 |
|
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int i, j; |
255 |
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|
256 |
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d = 1.0 - dv[2]*dv[2]; |
257 |
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i = d*nalt; |
258 |
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d = atan2(dv[1], dv[0]) * (0.5/PI); |
259 |
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if (d < 0.0) d += 1.0; |
260 |
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j = d*nazi + 0.5; |
261 |
|
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if (j >= nazi) j = 0; |
262 |
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return(i*nazi + j); |
263 |
|
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} |
264 |
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|
265 |
greg |
2.21 |
|
266 |
greg |
2.19 |
int |
267 |
greg |
2.18 |
my_default( /* default illum action */ |
268 |
schorsch |
2.12 |
OBJREC *ob, |
269 |
|
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struct illum_args *il, |
270 |
|
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char *nm |
271 |
|
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) |
272 |
greg |
1.1 |
{ |
273 |
greg |
1.2 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
274 |
|
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nm, ofun[ob->otype].funame, ob->oname); |
275 |
|
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error(WARNING, errmsg); |
276 |
greg |
2.2 |
printobj(il->altmat, ob); |
277 |
greg |
2.13 |
return(1); |
278 |
greg |
1.2 |
} |
279 |
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|
280 |
|
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|
281 |
greg |
2.13 |
int |
282 |
greg |
2.18 |
my_face( /* make an illum face */ |
283 |
schorsch |
2.12 |
OBJREC *ob, |
284 |
|
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struct illum_args *il, |
285 |
|
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char *nm |
286 |
|
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) |
287 |
greg |
1.2 |
{ |
288 |
greg |
2.21 |
int dim[2]; |
289 |
greg |
2.25 |
int n, nalt, nazi, alti; |
290 |
greg |
1.10 |
double sp[2], r1, r2; |
291 |
greg |
2.25 |
int h; |
292 |
greg |
1.4 |
FVECT dn, org, dir; |
293 |
greg |
1.3 |
FVECT u, v; |
294 |
|
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double ur[2], vr[2]; |
295 |
greg |
2.21 |
MAT4 xfm; |
296 |
greg |
2.25 |
int nallow; |
297 |
greg |
2.21 |
FACE *fa; |
298 |
greg |
2.25 |
int i, j; |
299 |
greg |
1.3 |
/* get/check arguments */ |
300 |
|
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fa = getface(ob); |
301 |
|
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if (fa->area == 0.0) { |
302 |
|
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freeface(ob); |
303 |
greg |
2.19 |
return(my_default(ob, il, nm)); |
304 |
greg |
1.3 |
} |
305 |
|
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/* set up sampling */ |
306 |
greg |
2.21 |
if (il->sd != NULL) { |
307 |
|
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if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
308 |
|
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objerror(ob, WARNING, "illegal up direction"); |
309 |
|
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freeface(ob); |
310 |
|
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return(my_default(ob, il, nm)); |
311 |
|
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} |
312 |
|
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n = il->sd->ninc; |
313 |
greg |
2.22 |
} else { |
314 |
|
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if (il->sampdens <= 0) { |
315 |
|
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nalt = nazi = 1; /* diffuse assumption */ |
316 |
|
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} else { |
317 |
|
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n = PI * il->sampdens; |
318 |
|
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nalt = sqrt(n/PI) + .5; |
319 |
|
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nazi = PI*nalt + .5; |
320 |
|
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} |
321 |
greg |
2.21 |
n = nazi*nalt; |
322 |
greg |
2.22 |
} |
323 |
greg |
2.18 |
newdist(n); |
324 |
greg |
2.20 |
/* take first edge >= sqrt(area) */ |
325 |
greg |
2.4 |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
326 |
|
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u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
327 |
|
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
328 |
|
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u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
329 |
greg |
2.5 |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
330 |
greg |
2.3 |
break; |
331 |
|
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} |
332 |
|
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if (i < fa->nv) { /* got one! -- let's align our axes */ |
333 |
greg |
2.5 |
r2 = 1.0/sqrt(r1); |
334 |
|
|
u[0] *= r2; u[1] *= r2; u[2] *= r2; |
335 |
greg |
2.3 |
fcross(v, fa->norm, u); |
336 |
|
|
} else /* oh well, we'll just have to wing it */ |
337 |
|
|
mkaxes(u, v, fa->norm); |
338 |
|
|
/* now, find limits in (u,v) coordinates */ |
339 |
greg |
1.3 |
ur[0] = vr[0] = FHUGE; |
340 |
|
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ur[1] = vr[1] = -FHUGE; |
341 |
|
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for (i = 0; i < fa->nv; i++) { |
342 |
|
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r1 = DOT(VERTEX(fa,i),u); |
343 |
|
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if (r1 < ur[0]) ur[0] = r1; |
344 |
|
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if (r1 > ur[1]) ur[1] = r1; |
345 |
|
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r2 = DOT(VERTEX(fa,i),v); |
346 |
|
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if (r2 < vr[0]) vr[0] = r2; |
347 |
|
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if (r2 > vr[1]) vr[1] = r2; |
348 |
|
|
} |
349 |
|
|
dim[0] = random(); |
350 |
|
|
/* sample polygon */ |
351 |
greg |
2.25 |
nallow = 5*n*il->nsamps; |
352 |
greg |
2.21 |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
353 |
greg |
1.3 |
for (i = 0; i < il->nsamps; i++) { |
354 |
greg |
2.23 |
/* randomize direction */ |
355 |
greg |
2.21 |
h = ilhash(dim, 2) + i; |
356 |
|
|
if (il->sd != NULL) { |
357 |
|
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
358 |
|
|
} else { |
359 |
|
|
multisamp(sp, 2, urand(h)); |
360 |
|
|
alti = dim[1]/nazi; |
361 |
|
|
r1 = (alti + sp[0])/nalt; |
362 |
|
|
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
363 |
|
|
flatdir(dn, r1, r2); |
364 |
|
|
for (j = 0; j < 3; j++) |
365 |
|
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
366 |
|
|
dn[2]*fa->norm[j]; |
367 |
|
|
} |
368 |
greg |
2.23 |
/* randomize location */ |
369 |
greg |
1.3 |
do { |
370 |
greg |
2.25 |
multisamp(sp, 2, urand(h+4862+nallow)); |
371 |
greg |
1.10 |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
372 |
|
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
373 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
374 |
|
|
org[j] = r1*u[j] + r2*v[j] |
375 |
|
|
+ fa->offset*fa->norm[j]; |
376 |
greg |
2.25 |
} while (!inface(org, fa) && nallow-- > 0); |
377 |
|
|
if (nallow < 0) { |
378 |
greg |
1.3 |
objerror(ob, WARNING, "bad aspect"); |
379 |
greg |
2.18 |
rayclean(); |
380 |
greg |
1.3 |
freeface(ob); |
381 |
greg |
2.19 |
return(my_default(ob, il, nm)); |
382 |
greg |
1.3 |
} |
383 |
greg |
2.21 |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
384 |
greg |
2.25 |
r1 = -1.0001*il->thick - 5.*FTINY; |
385 |
greg |
2.21 |
else |
386 |
greg |
2.25 |
r1 = 5.*FTINY; |
387 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
388 |
greg |
2.21 |
org[j] += r1*fa->norm[j]; |
389 |
greg |
1.3 |
/* send sample */ |
390 |
greg |
2.21 |
raysamp(dim[1], org, dir); |
391 |
greg |
1.3 |
} |
392 |
greg |
2.25 |
/* add in direct component? */ |
393 |
greg |
2.29 |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
394 |
greg |
2.25 |
MAT4 ixfm; |
395 |
|
|
if (il->sd == NULL) { |
396 |
|
|
for (i = 3; i--; ) { |
397 |
|
|
ixfm[i][0] = u[i]; |
398 |
|
|
ixfm[i][1] = v[i]; |
399 |
|
|
ixfm[i][2] = fa->norm[i]; |
400 |
|
|
ixfm[i][3] = 0.; |
401 |
|
|
} |
402 |
|
|
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
403 |
|
|
ixfm[3][3] = 1.; |
404 |
greg |
2.29 |
} else { |
405 |
|
|
if (!invmat4(ixfm, xfm)) |
406 |
|
|
objerror(ob, INTERNAL, |
407 |
|
|
"cannot invert BSDF transform"); |
408 |
|
|
if (!(il->flags & IL_LIGHT)) |
409 |
|
|
new_discount(); |
410 |
|
|
} |
411 |
greg |
2.25 |
dim[0] = random(); |
412 |
|
|
nallow = 10*il->nsamps; |
413 |
|
|
for (i = 0; i < il->nsamps; i++) { |
414 |
|
|
/* randomize location */ |
415 |
|
|
h = dim[0] + samplendx++; |
416 |
|
|
do { |
417 |
|
|
multisamp(sp, 2, urand(h+nallow)); |
418 |
|
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
419 |
|
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
420 |
|
|
for (j = 0; j < 3; j++) |
421 |
|
|
org[j] = r1*u[j] + r2*v[j] |
422 |
|
|
+ fa->offset*fa->norm[j]; |
423 |
|
|
} while (!inface(org, fa) && nallow-- > 0); |
424 |
|
|
if (nallow < 0) { |
425 |
|
|
objerror(ob, WARNING, "bad aspect"); |
426 |
|
|
rayclean(); |
427 |
|
|
freeface(ob); |
428 |
|
|
return(my_default(ob, il, nm)); |
429 |
|
|
} |
430 |
|
|
/* sample source rays */ |
431 |
|
|
srcsamps(il, org, fa->norm, ixfm); |
432 |
|
|
} |
433 |
|
|
} |
434 |
|
|
/* wait for all rays to finish */ |
435 |
greg |
2.18 |
rayclean(); |
436 |
greg |
2.22 |
if (il->sd != NULL) { /* run distribution through BSDF */ |
437 |
|
|
nalt = sqrt(il->sd->nout/PI) + .5; |
438 |
|
|
nazi = PI*nalt + .5; |
439 |
greg |
2.21 |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
440 |
greg |
2.29 |
done_discount(); |
441 |
greg |
2.28 |
if (!il->sampdens) |
442 |
|
|
il->sampdens = nalt*nazi/PI + .999; |
443 |
greg |
2.22 |
} |
444 |
greg |
1.11 |
/* write out the face and its distribution */ |
445 |
greg |
2.21 |
if (average(il, distarr, n)) { |
446 |
greg |
1.12 |
if (il->sampdens > 0) |
447 |
|
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
448 |
|
|
illumout(il, ob); |
449 |
greg |
2.2 |
} else |
450 |
greg |
1.12 |
printobj(il->altmat, ob); |
451 |
greg |
1.3 |
/* clean up */ |
452 |
|
|
freeface(ob); |
453 |
greg |
2.15 |
return(0); |
454 |
greg |
1.2 |
} |
455 |
|
|
|
456 |
|
|
|
457 |
greg |
2.13 |
int |
458 |
greg |
2.18 |
my_sphere( /* make an illum sphere */ |
459 |
schorsch |
2.12 |
register OBJREC *ob, |
460 |
|
|
struct illum_args *il, |
461 |
|
|
char *nm |
462 |
|
|
) |
463 |
greg |
1.2 |
{ |
464 |
greg |
1.10 |
int dim[3]; |
465 |
greg |
1.2 |
int n, nalt, nazi; |
466 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
467 |
greg |
1.4 |
FVECT org, dir; |
468 |
greg |
1.2 |
FVECT u, v; |
469 |
|
|
register int i, j; |
470 |
|
|
/* check arguments */ |
471 |
|
|
if (ob->oargs.nfargs != 4) |
472 |
|
|
objerror(ob, USER, "bad # of arguments"); |
473 |
|
|
/* set up sampling */ |
474 |
greg |
1.11 |
if (il->sampdens <= 0) |
475 |
|
|
nalt = nazi = 1; |
476 |
|
|
else { |
477 |
|
|
n = 4.*PI * il->sampdens; |
478 |
greg |
2.7 |
nalt = sqrt(2./PI*n) + .5; |
479 |
|
|
nazi = PI/2.*nalt + .5; |
480 |
greg |
1.11 |
} |
481 |
greg |
2.21 |
if (il->sd != NULL) |
482 |
|
|
objerror(ob, WARNING, "BSDF ignored"); |
483 |
greg |
1.2 |
n = nalt*nazi; |
484 |
greg |
2.18 |
newdist(n); |
485 |
greg |
1.2 |
dim[0] = random(); |
486 |
|
|
/* sample sphere */ |
487 |
|
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
488 |
greg |
1.8 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
489 |
greg |
1.2 |
for (i = 0; i < il->nsamps; i++) { |
490 |
greg |
1.10 |
/* next sample point */ |
491 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
492 |
greg |
1.2 |
/* random direction */ |
493 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
494 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
495 |
greg |
1.2 |
rounddir(dir, r1, r2); |
496 |
|
|
/* random location */ |
497 |
greg |
1.8 |
mkaxes(u, v, dir); /* yuck! */ |
498 |
greg |
1.10 |
r3 = sqrt(sp[2]); |
499 |
|
|
r2 = 2.*PI*sp[3]; |
500 |
greg |
1.5 |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
501 |
|
|
r2 = r3*ob->oargs.farg[3]*sin(r2); |
502 |
|
|
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
503 |
|
|
for (j = 0; j < 3; j++) { |
504 |
|
|
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
505 |
|
|
r3*dir[j]; |
506 |
|
|
dir[j] = -dir[j]; |
507 |
|
|
} |
508 |
greg |
1.2 |
/* send sample */ |
509 |
greg |
2.18 |
raysamp(dim[1]*nazi+dim[2], org, dir); |
510 |
greg |
1.2 |
} |
511 |
greg |
2.25 |
/* wait for all rays to finish */ |
512 |
greg |
2.18 |
rayclean(); |
513 |
greg |
1.11 |
/* write out the sphere and its distribution */ |
514 |
greg |
2.21 |
if (average(il, distarr, n)) { |
515 |
greg |
1.12 |
if (il->sampdens > 0) |
516 |
|
|
roundout(il, distarr, nalt, nazi); |
517 |
|
|
else |
518 |
|
|
objerror(ob, WARNING, "diffuse distribution"); |
519 |
|
|
illumout(il, ob); |
520 |
greg |
2.2 |
} else |
521 |
greg |
1.12 |
printobj(il->altmat, ob); |
522 |
greg |
1.2 |
/* clean up */ |
523 |
greg |
2.13 |
return(1); |
524 |
greg |
1.2 |
} |
525 |
|
|
|
526 |
|
|
|
527 |
greg |
2.13 |
int |
528 |
greg |
2.18 |
my_ring( /* make an illum ring */ |
529 |
schorsch |
2.12 |
OBJREC *ob, |
530 |
|
|
struct illum_args *il, |
531 |
|
|
char *nm |
532 |
|
|
) |
533 |
greg |
1.2 |
{ |
534 |
greg |
2.21 |
int dim[2]; |
535 |
|
|
int n, nalt, nazi, alti; |
536 |
|
|
double sp[2], r1, r2, r3; |
537 |
|
|
int h; |
538 |
greg |
1.4 |
FVECT dn, org, dir; |
539 |
greg |
1.3 |
FVECT u, v; |
540 |
greg |
2.21 |
MAT4 xfm; |
541 |
|
|
CONE *co; |
542 |
greg |
2.25 |
int i, j; |
543 |
greg |
1.3 |
/* get/check arguments */ |
544 |
|
|
co = getcone(ob, 0); |
545 |
|
|
/* set up sampling */ |
546 |
greg |
2.21 |
if (il->sd != NULL) { |
547 |
|
|
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
548 |
|
|
objerror(ob, WARNING, "illegal up direction"); |
549 |
|
|
freecone(ob); |
550 |
|
|
return(my_default(ob, il, nm)); |
551 |
|
|
} |
552 |
|
|
n = il->sd->ninc; |
553 |
greg |
2.22 |
} else { |
554 |
|
|
if (il->sampdens <= 0) { |
555 |
|
|
nalt = nazi = 1; /* diffuse assumption */ |
556 |
|
|
} else { |
557 |
|
|
n = PI * il->sampdens; |
558 |
|
|
nalt = sqrt(n/PI) + .5; |
559 |
|
|
nazi = PI*nalt + .5; |
560 |
|
|
} |
561 |
greg |
2.21 |
n = nazi*nalt; |
562 |
greg |
2.22 |
} |
563 |
greg |
2.18 |
newdist(n); |
564 |
greg |
1.3 |
mkaxes(u, v, co->ad); |
565 |
|
|
dim[0] = random(); |
566 |
|
|
/* sample disk */ |
567 |
greg |
2.21 |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
568 |
greg |
1.3 |
for (i = 0; i < il->nsamps; i++) { |
569 |
greg |
1.10 |
/* next sample point */ |
570 |
greg |
2.21 |
h = ilhash(dim,2) + i; |
571 |
greg |
2.23 |
/* randomize direction */ |
572 |
greg |
2.21 |
if (il->sd != NULL) { |
573 |
|
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
574 |
|
|
} else { |
575 |
|
|
multisamp(sp, 2, urand(h)); |
576 |
|
|
alti = dim[1]/nazi; |
577 |
|
|
r1 = (alti + sp[0])/nalt; |
578 |
|
|
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
579 |
|
|
flatdir(dn, r1, r2); |
580 |
|
|
for (j = 0; j < 3; j++) |
581 |
greg |
2.24 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
582 |
greg |
2.21 |
} |
583 |
greg |
2.23 |
/* randomize location */ |
584 |
greg |
2.21 |
multisamp(sp, 2, urand(h+8371)); |
585 |
greg |
1.5 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
586 |
greg |
2.21 |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
587 |
|
|
r2 = 2.*PI*sp[1]; |
588 |
greg |
1.5 |
r1 = r3*cos(r2); |
589 |
|
|
r2 = r3*sin(r2); |
590 |
greg |
2.21 |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
591 |
greg |
2.25 |
r3 = -1.0001*il->thick - 5.*FTINY; |
592 |
greg |
2.21 |
else |
593 |
greg |
2.25 |
r3 = 5.*FTINY; |
594 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
595 |
greg |
2.6 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
596 |
greg |
2.21 |
r3*co->ad[j]; |
597 |
greg |
1.3 |
/* send sample */ |
598 |
greg |
2.21 |
raysamp(dim[1], org, dir); |
599 |
greg |
1.3 |
} |
600 |
greg |
2.25 |
/* add in direct component? */ |
601 |
greg |
2.29 |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
602 |
greg |
2.25 |
MAT4 ixfm; |
603 |
|
|
if (il->sd == NULL) { |
604 |
|
|
for (i = 3; i--; ) { |
605 |
|
|
ixfm[i][0] = u[i]; |
606 |
|
|
ixfm[i][1] = v[i]; |
607 |
|
|
ixfm[i][2] = co->ad[i]; |
608 |
|
|
ixfm[i][3] = 0.; |
609 |
|
|
} |
610 |
|
|
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
611 |
|
|
ixfm[3][3] = 1.; |
612 |
greg |
2.29 |
} else { |
613 |
|
|
if (!invmat4(ixfm, xfm)) |
614 |
|
|
objerror(ob, INTERNAL, |
615 |
|
|
"cannot invert BSDF transform"); |
616 |
|
|
if (!(il->flags & IL_LIGHT)) |
617 |
|
|
new_discount(); |
618 |
|
|
} |
619 |
greg |
2.25 |
dim[0] = random(); |
620 |
|
|
for (i = 0; i < il->nsamps; i++) { |
621 |
|
|
/* randomize location */ |
622 |
|
|
h = dim[0] + samplendx++; |
623 |
|
|
multisamp(sp, 2, urand(h)); |
624 |
|
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
625 |
|
|
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
626 |
|
|
r2 = 2.*PI*sp[1]; |
627 |
|
|
r1 = r3*cos(r2); |
628 |
|
|
r2 = r3*sin(r2); |
629 |
|
|
for (j = 0; j < 3; j++) |
630 |
|
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
631 |
|
|
/* sample source rays */ |
632 |
|
|
srcsamps(il, org, co->ad, ixfm); |
633 |
|
|
} |
634 |
|
|
} |
635 |
|
|
/* wait for all rays to finish */ |
636 |
greg |
2.18 |
rayclean(); |
637 |
greg |
2.22 |
if (il->sd != NULL) { /* run distribution through BSDF */ |
638 |
|
|
nalt = sqrt(il->sd->nout/PI) + .5; |
639 |
|
|
nazi = PI*nalt + .5; |
640 |
greg |
2.21 |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
641 |
greg |
2.29 |
done_discount(); |
642 |
greg |
2.28 |
if (!il->sampdens) |
643 |
|
|
il->sampdens = nalt*nazi/PI + .999; |
644 |
greg |
2.22 |
} |
645 |
greg |
1.11 |
/* write out the ring and its distribution */ |
646 |
greg |
2.21 |
if (average(il, distarr, n)) { |
647 |
greg |
1.12 |
if (il->sampdens > 0) |
648 |
|
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
649 |
|
|
illumout(il, ob); |
650 |
greg |
2.2 |
} else |
651 |
greg |
1.12 |
printobj(il->altmat, ob); |
652 |
greg |
1.3 |
/* clean up */ |
653 |
|
|
freecone(ob); |
654 |
greg |
2.13 |
return(1); |
655 |
greg |
1.2 |
} |