1 |
greg |
1.1 |
#ifndef lint |
2 |
schorsch |
2.10 |
static const char RCSid[] = "$Id: mkillum2.c,v 2.9 2003/02/22 02:07:24 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 |
|
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#include "mkillum.h" |
9 |
|
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#include "face.h" |
10 |
|
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#include "cone.h" |
11 |
greg |
1.2 |
#include "random.h" |
12 |
greg |
1.1 |
|
13 |
greg |
1.2 |
|
14 |
|
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o_default(ob, il, rt, nm) /* default illum action */ |
15 |
greg |
1.1 |
OBJREC *ob; |
16 |
|
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struct illum_args *il; |
17 |
|
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struct rtproc *rt; |
18 |
greg |
1.2 |
char *nm; |
19 |
greg |
1.1 |
{ |
20 |
greg |
1.2 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
21 |
|
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nm, ofun[ob->otype].funame, ob->oname); |
22 |
|
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error(WARNING, errmsg); |
23 |
greg |
2.2 |
printobj(il->altmat, ob); |
24 |
greg |
1.2 |
} |
25 |
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26 |
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27 |
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o_face(ob, il, rt, nm) /* make an illum face */ |
28 |
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OBJREC *ob; |
29 |
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struct illum_args *il; |
30 |
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struct rtproc *rt; |
31 |
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char *nm; |
32 |
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{ |
33 |
greg |
1.3 |
#define MAXMISS (5*n*il->nsamps) |
34 |
greg |
1.10 |
int dim[3]; |
35 |
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int n, nalt, nazi, h; |
36 |
greg |
1.3 |
float *distarr; |
37 |
greg |
1.10 |
double sp[2], r1, r2; |
38 |
greg |
1.4 |
FVECT dn, org, dir; |
39 |
greg |
1.3 |
FVECT u, v; |
40 |
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double ur[2], vr[2]; |
41 |
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int nmisses; |
42 |
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register FACE *fa; |
43 |
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register int i, j; |
44 |
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/* get/check arguments */ |
45 |
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fa = getface(ob); |
46 |
|
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if (fa->area == 0.0) { |
47 |
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freeface(ob); |
48 |
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o_default(ob, il, rt, nm); |
49 |
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return; |
50 |
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} |
51 |
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/* set up sampling */ |
52 |
greg |
1.11 |
if (il->sampdens <= 0) |
53 |
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nalt = nazi = 1; |
54 |
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else { |
55 |
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n = PI * il->sampdens; |
56 |
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nalt = sqrt(n/PI) + .5; |
57 |
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nazi = PI*nalt + .5; |
58 |
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} |
59 |
greg |
1.3 |
n = nalt*nazi; |
60 |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
61 |
|
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if (distarr == NULL) |
62 |
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error(SYSTEM, "out of memory in o_face"); |
63 |
greg |
2.3 |
/* take first edge longer than sqrt(area) */ |
64 |
greg |
2.4 |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
65 |
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u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
66 |
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
67 |
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u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
68 |
greg |
2.5 |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
69 |
greg |
2.3 |
break; |
70 |
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} |
71 |
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if (i < fa->nv) { /* got one! -- let's align our axes */ |
72 |
greg |
2.5 |
r2 = 1.0/sqrt(r1); |
73 |
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u[0] *= r2; u[1] *= r2; u[2] *= r2; |
74 |
greg |
2.3 |
fcross(v, fa->norm, u); |
75 |
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} else /* oh well, we'll just have to wing it */ |
76 |
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mkaxes(u, v, fa->norm); |
77 |
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/* now, find limits in (u,v) coordinates */ |
78 |
greg |
1.3 |
ur[0] = vr[0] = FHUGE; |
79 |
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ur[1] = vr[1] = -FHUGE; |
80 |
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for (i = 0; i < fa->nv; i++) { |
81 |
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r1 = DOT(VERTEX(fa,i),u); |
82 |
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if (r1 < ur[0]) ur[0] = r1; |
83 |
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if (r1 > ur[1]) ur[1] = r1; |
84 |
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r2 = DOT(VERTEX(fa,i),v); |
85 |
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if (r2 < vr[0]) vr[0] = r2; |
86 |
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if (r2 > vr[1]) vr[1] = r2; |
87 |
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} |
88 |
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dim[0] = random(); |
89 |
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/* sample polygon */ |
90 |
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nmisses = 0; |
91 |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
92 |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
93 |
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for (i = 0; i < il->nsamps; i++) { |
94 |
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/* random direction */ |
95 |
greg |
1.10 |
h = ilhash(dim, 3) + i; |
96 |
greg |
1.11 |
multisamp(sp, 2, urand(h)); |
97 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
98 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
99 |
greg |
1.3 |
flatdir(dn, r1, r2); |
100 |
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for (j = 0; j < 3; j++) |
101 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
102 |
greg |
1.3 |
/* random location */ |
103 |
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do { |
104 |
greg |
1.11 |
multisamp(sp, 2, urand(h+4862+nmisses)); |
105 |
greg |
1.10 |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
106 |
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r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
107 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
108 |
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org[j] = r1*u[j] + r2*v[j] |
109 |
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+ fa->offset*fa->norm[j]; |
110 |
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} while (!inface(org, fa) && nmisses++ < MAXMISS); |
111 |
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if (nmisses > MAXMISS) { |
112 |
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objerror(ob, WARNING, "bad aspect"); |
113 |
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rt->nrays = 0; |
114 |
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freeface(ob); |
115 |
greg |
2.9 |
free((void *)distarr); |
116 |
greg |
1.3 |
o_default(ob, il, rt, nm); |
117 |
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return; |
118 |
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} |
119 |
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for (j = 0; j < 3; j++) |
120 |
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org[j] += .001*fa->norm[j]; |
121 |
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/* send sample */ |
122 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
123 |
greg |
1.3 |
} |
124 |
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rayflush(rt); |
125 |
greg |
1.11 |
/* write out the face and its distribution */ |
126 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
127 |
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if (il->sampdens > 0) |
128 |
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flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
129 |
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illumout(il, ob); |
130 |
greg |
2.2 |
} else |
131 |
greg |
1.12 |
printobj(il->altmat, ob); |
132 |
greg |
1.3 |
/* clean up */ |
133 |
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freeface(ob); |
134 |
greg |
2.9 |
free((void *)distarr); |
135 |
greg |
1.3 |
#undef MAXMISS |
136 |
greg |
1.2 |
} |
137 |
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138 |
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139 |
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o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
140 |
greg |
1.3 |
register OBJREC *ob; |
141 |
greg |
1.2 |
struct illum_args *il; |
142 |
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struct rtproc *rt; |
143 |
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char *nm; |
144 |
|
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{ |
145 |
greg |
1.10 |
int dim[3]; |
146 |
greg |
1.2 |
int n, nalt, nazi; |
147 |
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float *distarr; |
148 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
149 |
greg |
1.4 |
FVECT org, dir; |
150 |
greg |
1.2 |
FVECT u, v; |
151 |
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register int i, j; |
152 |
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/* check arguments */ |
153 |
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if (ob->oargs.nfargs != 4) |
154 |
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objerror(ob, USER, "bad # of arguments"); |
155 |
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/* set up sampling */ |
156 |
greg |
1.11 |
if (il->sampdens <= 0) |
157 |
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nalt = nazi = 1; |
158 |
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else { |
159 |
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n = 4.*PI * il->sampdens; |
160 |
greg |
2.7 |
nalt = sqrt(2./PI*n) + .5; |
161 |
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nazi = PI/2.*nalt + .5; |
162 |
greg |
1.11 |
} |
163 |
greg |
1.2 |
n = nalt*nazi; |
164 |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
165 |
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if (distarr == NULL) |
166 |
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error(SYSTEM, "out of memory in o_sphere"); |
167 |
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dim[0] = random(); |
168 |
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/* sample sphere */ |
169 |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
170 |
greg |
1.8 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
171 |
greg |
1.2 |
for (i = 0; i < il->nsamps; i++) { |
172 |
greg |
1.10 |
/* next sample point */ |
173 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
174 |
greg |
1.2 |
/* random direction */ |
175 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
176 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
177 |
greg |
1.2 |
rounddir(dir, r1, r2); |
178 |
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/* random location */ |
179 |
greg |
1.8 |
mkaxes(u, v, dir); /* yuck! */ |
180 |
greg |
1.10 |
r3 = sqrt(sp[2]); |
181 |
|
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r2 = 2.*PI*sp[3]; |
182 |
greg |
1.5 |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
183 |
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r2 = r3*ob->oargs.farg[3]*sin(r2); |
184 |
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r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
185 |
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for (j = 0; j < 3; j++) { |
186 |
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org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
187 |
|
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r3*dir[j]; |
188 |
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dir[j] = -dir[j]; |
189 |
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} |
190 |
greg |
1.2 |
/* send sample */ |
191 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
192 |
greg |
1.2 |
} |
193 |
|
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rayflush(rt); |
194 |
greg |
1.11 |
/* write out the sphere and its distribution */ |
195 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
196 |
|
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if (il->sampdens > 0) |
197 |
|
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roundout(il, distarr, nalt, nazi); |
198 |
|
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else |
199 |
|
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objerror(ob, WARNING, "diffuse distribution"); |
200 |
|
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illumout(il, ob); |
201 |
greg |
2.2 |
} else |
202 |
greg |
1.12 |
printobj(il->altmat, ob); |
203 |
greg |
1.2 |
/* clean up */ |
204 |
greg |
2.9 |
free((void *)distarr); |
205 |
greg |
1.2 |
} |
206 |
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|
207 |
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208 |
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o_ring(ob, il, rt, nm) /* make an illum ring */ |
209 |
|
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OBJREC *ob; |
210 |
|
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struct illum_args *il; |
211 |
|
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struct rtproc *rt; |
212 |
|
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char *nm; |
213 |
|
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{ |
214 |
greg |
1.10 |
int dim[3]; |
215 |
greg |
1.3 |
int n, nalt, nazi; |
216 |
|
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float *distarr; |
217 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
218 |
greg |
1.4 |
FVECT dn, org, dir; |
219 |
greg |
1.3 |
FVECT u, v; |
220 |
|
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register CONE *co; |
221 |
|
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register int i, j; |
222 |
|
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/* get/check arguments */ |
223 |
|
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co = getcone(ob, 0); |
224 |
|
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/* set up sampling */ |
225 |
greg |
1.11 |
if (il->sampdens <= 0) |
226 |
|
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nalt = nazi = 1; |
227 |
|
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else { |
228 |
|
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n = PI * il->sampdens; |
229 |
|
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nalt = sqrt(n/PI) + .5; |
230 |
|
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nazi = PI*nalt + .5; |
231 |
|
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} |
232 |
greg |
1.3 |
n = nalt*nazi; |
233 |
|
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distarr = (float *)calloc(n, 3*sizeof(float)); |
234 |
|
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if (distarr == NULL) |
235 |
|
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error(SYSTEM, "out of memory in o_ring"); |
236 |
|
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mkaxes(u, v, co->ad); |
237 |
|
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dim[0] = random(); |
238 |
|
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/* sample disk */ |
239 |
|
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
240 |
|
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
241 |
|
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for (i = 0; i < il->nsamps; i++) { |
242 |
greg |
1.10 |
/* next sample point */ |
243 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
244 |
greg |
1.3 |
/* random direction */ |
245 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
246 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
247 |
greg |
1.3 |
flatdir(dn, r1, r2); |
248 |
|
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for (j = 0; j < 3; j++) |
249 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
250 |
greg |
1.3 |
/* random location */ |
251 |
greg |
1.5 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
252 |
greg |
1.10 |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
253 |
|
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r2 = 2.*PI*sp[3]; |
254 |
greg |
1.5 |
r1 = r3*cos(r2); |
255 |
|
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r2 = r3*sin(r2); |
256 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
257 |
greg |
2.6 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
258 |
greg |
1.5 |
.001*co->ad[j]; |
259 |
greg |
1.3 |
|
260 |
|
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/* send sample */ |
261 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
262 |
greg |
1.3 |
} |
263 |
|
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rayflush(rt); |
264 |
greg |
1.11 |
/* write out the ring and its distribution */ |
265 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
266 |
|
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if (il->sampdens > 0) |
267 |
|
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flatout(il, distarr, nalt, nazi, u, v, co->ad); |
268 |
|
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illumout(il, ob); |
269 |
greg |
2.2 |
} else |
270 |
greg |
1.12 |
printobj(il->altmat, ob); |
271 |
greg |
1.3 |
/* clean up */ |
272 |
|
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freecone(ob); |
273 |
greg |
2.9 |
free((void *)distarr); |
274 |
greg |
1.2 |
} |
275 |
|
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|
276 |
|
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|
277 |
|
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raysamp(res, org, dir, rt) /* compute a ray sample */ |
278 |
|
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float res[3]; |
279 |
|
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FVECT org, dir; |
280 |
|
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register struct rtproc *rt; |
281 |
|
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{ |
282 |
|
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register float *fp; |
283 |
|
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|
284 |
|
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if (rt->nrays == rt->bsiz) |
285 |
|
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rayflush(rt); |
286 |
|
|
rt->dest[rt->nrays] = res; |
287 |
|
|
fp = rt->buf + 6*rt->nrays++; |
288 |
|
|
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
289 |
|
|
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
290 |
|
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} |
291 |
|
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|
292 |
|
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|
293 |
|
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rayflush(rt) /* flush buffered rays */ |
294 |
|
|
register struct rtproc *rt; |
295 |
|
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{ |
296 |
|
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register int i; |
297 |
|
|
|
298 |
|
|
if (rt->nrays <= 0) |
299 |
|
|
return; |
300 |
greg |
1.9 |
bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
301 |
greg |
1.14 |
errno = 0; |
302 |
schorsch |
2.10 |
if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, |
303 |
gregl |
2.8 |
3*sizeof(float)*(rt->nrays+1), |
304 |
greg |
1.2 |
6*sizeof(float)*(rt->nrays+1)) < |
305 |
gregl |
2.8 |
3*sizeof(float)*(rt->nrays+1) ) |
306 |
greg |
1.2 |
error(SYSTEM, "error reading from rtrace process"); |
307 |
|
|
i = rt->nrays; |
308 |
|
|
while (i--) { |
309 |
|
|
rt->dest[i][0] += rt->buf[3*i]; |
310 |
|
|
rt->dest[i][1] += rt->buf[3*i+1]; |
311 |
|
|
rt->dest[i][2] += rt->buf[3*i+2]; |
312 |
|
|
} |
313 |
|
|
rt->nrays = 0; |
314 |
greg |
1.4 |
} |
315 |
|
|
|
316 |
|
|
|
317 |
|
|
mkaxes(u, v, n) /* compute u and v to go with n */ |
318 |
|
|
FVECT u, v, n; |
319 |
|
|
{ |
320 |
|
|
register int i; |
321 |
|
|
|
322 |
|
|
v[0] = v[1] = v[2] = 0.0; |
323 |
|
|
for (i = 0; i < 3; i++) |
324 |
|
|
if (n[i] < 0.6 && n[i] > -0.6) |
325 |
|
|
break; |
326 |
|
|
v[i] = 1.0; |
327 |
|
|
fcross(u, v, n); |
328 |
|
|
normalize(u); |
329 |
|
|
fcross(v, n, u); |
330 |
|
|
} |
331 |
|
|
|
332 |
|
|
|
333 |
|
|
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
334 |
|
|
register FVECT dv; |
335 |
|
|
double alt, azi; |
336 |
|
|
{ |
337 |
|
|
double d1, d2; |
338 |
|
|
|
339 |
|
|
dv[2] = 1. - 2.*alt; |
340 |
|
|
d1 = sqrt(1. - dv[2]*dv[2]); |
341 |
|
|
d2 = 2.*PI * azi; |
342 |
|
|
dv[0] = d1*cos(d2); |
343 |
|
|
dv[1] = d1*sin(d2); |
344 |
|
|
} |
345 |
|
|
|
346 |
|
|
|
347 |
|
|
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
348 |
|
|
register FVECT dv; |
349 |
|
|
double alt, azi; |
350 |
|
|
{ |
351 |
|
|
double d1, d2; |
352 |
|
|
|
353 |
|
|
d1 = sqrt(alt); |
354 |
|
|
d2 = 2.*PI * azi; |
355 |
|
|
dv[0] = d1*cos(d2); |
356 |
|
|
dv[1] = d1*sin(d2); |
357 |
greg |
1.6 |
dv[2] = sqrt(1. - alt); |
358 |
greg |
1.1 |
} |