1 |
greg |
1.1 |
#ifndef lint |
2 |
schorsch |
2.14 |
static const char RCSid[] = "$Id: mkillum2.c,v 2.13 2003/11/21 07:15:30 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
|
/* |
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 |
1.2 |
#include "random.h" |
14 |
greg |
1.1 |
|
15 |
greg |
2.13 |
|
16 |
|
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int o_default(FUN_ARGLIST); |
17 |
|
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int o_face(FUN_ARGLIST); |
18 |
|
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int o_sphere(FUN_ARGLIST); |
19 |
|
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int o_ring(FUN_ARGLIST); |
20 |
schorsch |
2.12 |
void raysamp(float res[3], FVECT org, FVECT dir, struct rtproc *rt); |
21 |
|
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void rayflush(struct rtproc *rt); |
22 |
|
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void mkaxes(FVECT u, FVECT v, FVECT n); |
23 |
|
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void rounddir(FVECT dv, double alt, double azi); |
24 |
|
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void flatdir(FVECT dv, double alt, double azi); |
25 |
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26 |
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27 |
|
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int /* XXX type conflict with otypes.h */ |
28 |
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o_default( /* default illum action */ |
29 |
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OBJREC *ob, |
30 |
|
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struct illum_args *il, |
31 |
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struct rtproc *rt, |
32 |
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char *nm |
33 |
|
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) |
34 |
greg |
1.1 |
{ |
35 |
greg |
1.2 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
36 |
|
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nm, ofun[ob->otype].funame, ob->oname); |
37 |
|
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error(WARNING, errmsg); |
38 |
greg |
2.2 |
printobj(il->altmat, ob); |
39 |
greg |
2.13 |
return(1); |
40 |
greg |
1.2 |
} |
41 |
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|
42 |
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|
43 |
greg |
2.13 |
int |
44 |
schorsch |
2.12 |
o_face( /* make an illum face */ |
45 |
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OBJREC *ob, |
46 |
|
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struct illum_args *il, |
47 |
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struct rtproc *rt, |
48 |
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char *nm |
49 |
|
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) |
50 |
greg |
1.2 |
{ |
51 |
greg |
1.3 |
#define MAXMISS (5*n*il->nsamps) |
52 |
greg |
1.10 |
int dim[3]; |
53 |
|
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int n, nalt, nazi, h; |
54 |
greg |
1.3 |
float *distarr; |
55 |
greg |
1.10 |
double sp[2], r1, r2; |
56 |
greg |
1.4 |
FVECT dn, org, dir; |
57 |
greg |
1.3 |
FVECT u, v; |
58 |
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double ur[2], vr[2]; |
59 |
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int nmisses; |
60 |
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register FACE *fa; |
61 |
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register int i, j; |
62 |
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/* get/check arguments */ |
63 |
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fa = getface(ob); |
64 |
|
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if (fa->area == 0.0) { |
65 |
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freeface(ob); |
66 |
greg |
2.13 |
return(o_default(ob, il, rt, nm)); |
67 |
greg |
1.3 |
} |
68 |
|
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/* set up sampling */ |
69 |
greg |
1.11 |
if (il->sampdens <= 0) |
70 |
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nalt = nazi = 1; |
71 |
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else { |
72 |
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n = PI * il->sampdens; |
73 |
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nalt = sqrt(n/PI) + .5; |
74 |
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nazi = PI*nalt + .5; |
75 |
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} |
76 |
greg |
1.3 |
n = nalt*nazi; |
77 |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
78 |
|
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if (distarr == NULL) |
79 |
|
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error(SYSTEM, "out of memory in o_face"); |
80 |
greg |
2.3 |
/* take first edge longer than sqrt(area) */ |
81 |
greg |
2.4 |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
82 |
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u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
83 |
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
84 |
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u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
85 |
greg |
2.5 |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
86 |
greg |
2.3 |
break; |
87 |
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} |
88 |
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if (i < fa->nv) { /* got one! -- let's align our axes */ |
89 |
greg |
2.5 |
r2 = 1.0/sqrt(r1); |
90 |
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u[0] *= r2; u[1] *= r2; u[2] *= r2; |
91 |
greg |
2.3 |
fcross(v, fa->norm, u); |
92 |
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} else /* oh well, we'll just have to wing it */ |
93 |
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mkaxes(u, v, fa->norm); |
94 |
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/* now, find limits in (u,v) coordinates */ |
95 |
greg |
1.3 |
ur[0] = vr[0] = FHUGE; |
96 |
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ur[1] = vr[1] = -FHUGE; |
97 |
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for (i = 0; i < fa->nv; i++) { |
98 |
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r1 = DOT(VERTEX(fa,i),u); |
99 |
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if (r1 < ur[0]) ur[0] = r1; |
100 |
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if (r1 > ur[1]) ur[1] = r1; |
101 |
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r2 = DOT(VERTEX(fa,i),v); |
102 |
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if (r2 < vr[0]) vr[0] = r2; |
103 |
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if (r2 > vr[1]) vr[1] = r2; |
104 |
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} |
105 |
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dim[0] = random(); |
106 |
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/* sample polygon */ |
107 |
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nmisses = 0; |
108 |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
109 |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
110 |
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for (i = 0; i < il->nsamps; i++) { |
111 |
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/* random direction */ |
112 |
greg |
1.10 |
h = ilhash(dim, 3) + i; |
113 |
greg |
1.11 |
multisamp(sp, 2, urand(h)); |
114 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
115 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
116 |
greg |
1.3 |
flatdir(dn, r1, r2); |
117 |
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for (j = 0; j < 3; j++) |
118 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
119 |
greg |
1.3 |
/* random location */ |
120 |
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do { |
121 |
greg |
1.11 |
multisamp(sp, 2, urand(h+4862+nmisses)); |
122 |
greg |
1.10 |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
123 |
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r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
124 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
125 |
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org[j] = r1*u[j] + r2*v[j] |
126 |
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+ fa->offset*fa->norm[j]; |
127 |
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} while (!inface(org, fa) && nmisses++ < MAXMISS); |
128 |
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if (nmisses > MAXMISS) { |
129 |
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objerror(ob, WARNING, "bad aspect"); |
130 |
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rt->nrays = 0; |
131 |
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freeface(ob); |
132 |
greg |
2.9 |
free((void *)distarr); |
133 |
greg |
2.13 |
return(o_default(ob, il, rt, nm)); |
134 |
greg |
1.3 |
} |
135 |
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for (j = 0; j < 3; j++) |
136 |
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org[j] += .001*fa->norm[j]; |
137 |
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/* send sample */ |
138 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
139 |
greg |
1.3 |
} |
140 |
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rayflush(rt); |
141 |
greg |
1.11 |
/* write out the face and its distribution */ |
142 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
143 |
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if (il->sampdens > 0) |
144 |
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flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
145 |
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illumout(il, ob); |
146 |
greg |
2.2 |
} else |
147 |
greg |
1.12 |
printobj(il->altmat, ob); |
148 |
greg |
1.3 |
/* clean up */ |
149 |
|
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freeface(ob); |
150 |
greg |
2.9 |
free((void *)distarr); |
151 |
greg |
1.3 |
#undef MAXMISS |
152 |
schorsch |
2.14 |
/* XXX we need to return something here. what is it? */ |
153 |
greg |
1.2 |
} |
154 |
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|
155 |
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|
156 |
greg |
2.13 |
int |
157 |
schorsch |
2.12 |
o_sphere( /* make an illum sphere */ |
158 |
|
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register OBJREC *ob, |
159 |
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struct illum_args *il, |
160 |
|
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struct rtproc *rt, |
161 |
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char *nm |
162 |
|
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) |
163 |
greg |
1.2 |
{ |
164 |
greg |
1.10 |
int dim[3]; |
165 |
greg |
1.2 |
int n, nalt, nazi; |
166 |
|
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float *distarr; |
167 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
168 |
greg |
1.4 |
FVECT org, dir; |
169 |
greg |
1.2 |
FVECT u, v; |
170 |
|
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register int i, j; |
171 |
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/* check arguments */ |
172 |
|
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if (ob->oargs.nfargs != 4) |
173 |
|
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objerror(ob, USER, "bad # of arguments"); |
174 |
|
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/* set up sampling */ |
175 |
greg |
1.11 |
if (il->sampdens <= 0) |
176 |
|
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nalt = nazi = 1; |
177 |
|
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else { |
178 |
|
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n = 4.*PI * il->sampdens; |
179 |
greg |
2.7 |
nalt = sqrt(2./PI*n) + .5; |
180 |
|
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nazi = PI/2.*nalt + .5; |
181 |
greg |
1.11 |
} |
182 |
greg |
1.2 |
n = nalt*nazi; |
183 |
|
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distarr = (float *)calloc(n, 3*sizeof(float)); |
184 |
|
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if (distarr == NULL) |
185 |
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error(SYSTEM, "out of memory in o_sphere"); |
186 |
|
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dim[0] = random(); |
187 |
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/* sample sphere */ |
188 |
|
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
189 |
greg |
1.8 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
190 |
greg |
1.2 |
for (i = 0; i < il->nsamps; i++) { |
191 |
greg |
1.10 |
/* next sample point */ |
192 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
193 |
greg |
1.2 |
/* random direction */ |
194 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
195 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
196 |
greg |
1.2 |
rounddir(dir, r1, r2); |
197 |
|
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/* random location */ |
198 |
greg |
1.8 |
mkaxes(u, v, dir); /* yuck! */ |
199 |
greg |
1.10 |
r3 = sqrt(sp[2]); |
200 |
|
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r2 = 2.*PI*sp[3]; |
201 |
greg |
1.5 |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
202 |
|
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r2 = r3*ob->oargs.farg[3]*sin(r2); |
203 |
|
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r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
204 |
|
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for (j = 0; j < 3; j++) { |
205 |
|
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org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
206 |
|
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r3*dir[j]; |
207 |
|
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dir[j] = -dir[j]; |
208 |
|
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} |
209 |
greg |
1.2 |
/* send sample */ |
210 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
211 |
greg |
1.2 |
} |
212 |
|
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rayflush(rt); |
213 |
greg |
1.11 |
/* write out the sphere and its distribution */ |
214 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
215 |
|
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if (il->sampdens > 0) |
216 |
|
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roundout(il, distarr, nalt, nazi); |
217 |
|
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else |
218 |
|
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objerror(ob, WARNING, "diffuse distribution"); |
219 |
|
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illumout(il, ob); |
220 |
greg |
2.2 |
} else |
221 |
greg |
1.12 |
printobj(il->altmat, ob); |
222 |
greg |
1.2 |
/* clean up */ |
223 |
greg |
2.9 |
free((void *)distarr); |
224 |
greg |
2.13 |
return(1); |
225 |
greg |
1.2 |
} |
226 |
|
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|
227 |
|
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|
228 |
greg |
2.13 |
int |
229 |
schorsch |
2.12 |
o_ring( /* make an illum ring */ |
230 |
|
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OBJREC *ob, |
231 |
|
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struct illum_args *il, |
232 |
|
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struct rtproc *rt, |
233 |
|
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char *nm |
234 |
|
|
) |
235 |
greg |
1.2 |
{ |
236 |
greg |
1.10 |
int dim[3]; |
237 |
greg |
1.3 |
int n, nalt, nazi; |
238 |
|
|
float *distarr; |
239 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
240 |
greg |
1.4 |
FVECT dn, org, dir; |
241 |
greg |
1.3 |
FVECT u, v; |
242 |
|
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register CONE *co; |
243 |
|
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register int i, j; |
244 |
|
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/* get/check arguments */ |
245 |
|
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co = getcone(ob, 0); |
246 |
|
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/* set up sampling */ |
247 |
greg |
1.11 |
if (il->sampdens <= 0) |
248 |
|
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nalt = nazi = 1; |
249 |
|
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else { |
250 |
|
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n = PI * il->sampdens; |
251 |
|
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nalt = sqrt(n/PI) + .5; |
252 |
|
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nazi = PI*nalt + .5; |
253 |
|
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} |
254 |
greg |
1.3 |
n = nalt*nazi; |
255 |
|
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distarr = (float *)calloc(n, 3*sizeof(float)); |
256 |
|
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if (distarr == NULL) |
257 |
|
|
error(SYSTEM, "out of memory in o_ring"); |
258 |
|
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mkaxes(u, v, co->ad); |
259 |
|
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dim[0] = random(); |
260 |
|
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/* sample disk */ |
261 |
|
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
262 |
|
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
263 |
|
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for (i = 0; i < il->nsamps; i++) { |
264 |
greg |
1.10 |
/* next sample point */ |
265 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
266 |
greg |
1.3 |
/* random direction */ |
267 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
268 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
269 |
greg |
1.3 |
flatdir(dn, r1, r2); |
270 |
|
|
for (j = 0; j < 3; j++) |
271 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
272 |
greg |
1.3 |
/* random location */ |
273 |
greg |
1.5 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
274 |
greg |
1.10 |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
275 |
|
|
r2 = 2.*PI*sp[3]; |
276 |
greg |
1.5 |
r1 = r3*cos(r2); |
277 |
|
|
r2 = r3*sin(r2); |
278 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
279 |
greg |
2.6 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
280 |
greg |
1.5 |
.001*co->ad[j]; |
281 |
greg |
1.3 |
|
282 |
|
|
/* send sample */ |
283 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
284 |
greg |
1.3 |
} |
285 |
|
|
rayflush(rt); |
286 |
greg |
1.11 |
/* write out the ring and its distribution */ |
287 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
288 |
|
|
if (il->sampdens > 0) |
289 |
|
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
290 |
|
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illumout(il, ob); |
291 |
greg |
2.2 |
} else |
292 |
greg |
1.12 |
printobj(il->altmat, ob); |
293 |
greg |
1.3 |
/* clean up */ |
294 |
|
|
freecone(ob); |
295 |
greg |
2.9 |
free((void *)distarr); |
296 |
greg |
2.13 |
return(1); |
297 |
greg |
1.2 |
} |
298 |
|
|
|
299 |
|
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|
300 |
schorsch |
2.12 |
void |
301 |
|
|
raysamp( /* compute a ray sample */ |
302 |
|
|
float res[3], |
303 |
|
|
FVECT org, |
304 |
|
|
FVECT dir, |
305 |
|
|
register struct rtproc *rt |
306 |
|
|
) |
307 |
greg |
1.2 |
{ |
308 |
|
|
register float *fp; |
309 |
|
|
|
310 |
|
|
if (rt->nrays == rt->bsiz) |
311 |
|
|
rayflush(rt); |
312 |
|
|
rt->dest[rt->nrays] = res; |
313 |
|
|
fp = rt->buf + 6*rt->nrays++; |
314 |
|
|
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
315 |
|
|
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
316 |
|
|
} |
317 |
|
|
|
318 |
|
|
|
319 |
schorsch |
2.12 |
void |
320 |
|
|
rayflush( /* flush buffered rays */ |
321 |
|
|
register struct rtproc *rt |
322 |
|
|
) |
323 |
greg |
1.2 |
{ |
324 |
|
|
register int i; |
325 |
|
|
|
326 |
|
|
if (rt->nrays <= 0) |
327 |
|
|
return; |
328 |
schorsch |
2.11 |
memset(rt->buf+6*rt->nrays, '\0', 6*sizeof(float)); |
329 |
greg |
1.14 |
errno = 0; |
330 |
schorsch |
2.10 |
if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, |
331 |
gregl |
2.8 |
3*sizeof(float)*(rt->nrays+1), |
332 |
greg |
1.2 |
6*sizeof(float)*(rt->nrays+1)) < |
333 |
gregl |
2.8 |
3*sizeof(float)*(rt->nrays+1) ) |
334 |
greg |
1.2 |
error(SYSTEM, "error reading from rtrace process"); |
335 |
|
|
i = rt->nrays; |
336 |
|
|
while (i--) { |
337 |
|
|
rt->dest[i][0] += rt->buf[3*i]; |
338 |
|
|
rt->dest[i][1] += rt->buf[3*i+1]; |
339 |
|
|
rt->dest[i][2] += rt->buf[3*i+2]; |
340 |
|
|
} |
341 |
|
|
rt->nrays = 0; |
342 |
greg |
1.4 |
} |
343 |
|
|
|
344 |
|
|
|
345 |
schorsch |
2.12 |
void |
346 |
|
|
mkaxes( /* compute u and v to go with n */ |
347 |
|
|
FVECT u, |
348 |
|
|
FVECT v, |
349 |
|
|
FVECT n |
350 |
|
|
) |
351 |
greg |
1.4 |
{ |
352 |
|
|
register int i; |
353 |
|
|
|
354 |
|
|
v[0] = v[1] = v[2] = 0.0; |
355 |
|
|
for (i = 0; i < 3; i++) |
356 |
|
|
if (n[i] < 0.6 && n[i] > -0.6) |
357 |
|
|
break; |
358 |
|
|
v[i] = 1.0; |
359 |
|
|
fcross(u, v, n); |
360 |
|
|
normalize(u); |
361 |
|
|
fcross(v, n, u); |
362 |
|
|
} |
363 |
|
|
|
364 |
|
|
|
365 |
schorsch |
2.12 |
void |
366 |
|
|
rounddir( /* compute uniform spherical direction */ |
367 |
|
|
register FVECT dv, |
368 |
|
|
double alt, |
369 |
|
|
double azi |
370 |
|
|
) |
371 |
greg |
1.4 |
{ |
372 |
|
|
double d1, d2; |
373 |
|
|
|
374 |
|
|
dv[2] = 1. - 2.*alt; |
375 |
|
|
d1 = sqrt(1. - dv[2]*dv[2]); |
376 |
|
|
d2 = 2.*PI * azi; |
377 |
|
|
dv[0] = d1*cos(d2); |
378 |
|
|
dv[1] = d1*sin(d2); |
379 |
|
|
} |
380 |
|
|
|
381 |
|
|
|
382 |
schorsch |
2.12 |
void |
383 |
|
|
flatdir( /* compute uniform hemispherical direction */ |
384 |
|
|
register FVECT dv, |
385 |
|
|
double alt, |
386 |
|
|
double azi |
387 |
|
|
) |
388 |
greg |
1.4 |
{ |
389 |
|
|
double d1, d2; |
390 |
|
|
|
391 |
|
|
d1 = sqrt(alt); |
392 |
|
|
d2 = 2.*PI * azi; |
393 |
|
|
dv[0] = d1*cos(d2); |
394 |
|
|
dv[1] = d1*sin(d2); |
395 |
greg |
1.6 |
dv[2] = sqrt(1. - alt); |
396 |
greg |
1.1 |
} |