1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
|
|
|
3 |
|
|
#ifndef lint |
4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
|
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
greg |
1.4 |
* Routines to do the actual calculation for mkillum |
9 |
greg |
1.1 |
*/ |
10 |
|
|
|
11 |
|
|
#include "mkillum.h" |
12 |
|
|
|
13 |
|
|
#include "face.h" |
14 |
|
|
|
15 |
|
|
#include "cone.h" |
16 |
|
|
|
17 |
greg |
1.2 |
#include "random.h" |
18 |
greg |
1.1 |
|
19 |
greg |
1.2 |
|
20 |
|
|
o_default(ob, il, rt, nm) /* default illum action */ |
21 |
greg |
1.1 |
OBJREC *ob; |
22 |
|
|
struct illum_args *il; |
23 |
|
|
struct rtproc *rt; |
24 |
greg |
1.2 |
char *nm; |
25 |
greg |
1.1 |
{ |
26 |
greg |
1.2 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
27 |
|
|
nm, ofun[ob->otype].funame, ob->oname); |
28 |
|
|
error(WARNING, errmsg); |
29 |
|
|
if (!(il->flags & IL_LIGHT)) |
30 |
greg |
1.4 |
printobj(il->altmat, ob); |
31 |
greg |
1.2 |
} |
32 |
|
|
|
33 |
|
|
|
34 |
|
|
o_face(ob, il, rt, nm) /* make an illum face */ |
35 |
|
|
OBJREC *ob; |
36 |
|
|
struct illum_args *il; |
37 |
|
|
struct rtproc *rt; |
38 |
|
|
char *nm; |
39 |
|
|
{ |
40 |
greg |
1.3 |
#define MAXMISS (5*n*il->nsamps) |
41 |
|
|
int dim[4]; |
42 |
|
|
int n, nalt, nazi; |
43 |
|
|
float *distarr; |
44 |
|
|
double r1, r2; |
45 |
greg |
1.4 |
FVECT dn, org, dir; |
46 |
greg |
1.3 |
FVECT u, v; |
47 |
|
|
double ur[2], vr[2]; |
48 |
|
|
int nmisses; |
49 |
|
|
register FACE *fa; |
50 |
|
|
register int i, j; |
51 |
|
|
/* get/check arguments */ |
52 |
|
|
fa = getface(ob); |
53 |
|
|
if (fa->area == 0.0) { |
54 |
|
|
freeface(ob); |
55 |
|
|
o_default(ob, il, rt, nm); |
56 |
|
|
return; |
57 |
|
|
} |
58 |
|
|
/* set up sampling */ |
59 |
|
|
n = PI * il->sampdens; |
60 |
|
|
nalt = sqrt(n/PI) + .5; |
61 |
|
|
nazi = PI*nalt + .5; |
62 |
|
|
n = nalt*nazi; |
63 |
|
|
distarr = (float *)calloc(n, 3*sizeof(float)); |
64 |
|
|
if (distarr == NULL) |
65 |
|
|
error(SYSTEM, "out of memory in o_face"); |
66 |
|
|
mkaxes(u, v, fa->norm); |
67 |
|
|
ur[0] = vr[0] = FHUGE; |
68 |
|
|
ur[1] = vr[1] = -FHUGE; |
69 |
|
|
for (i = 0; i < fa->nv; i++) { |
70 |
|
|
r1 = DOT(VERTEX(fa,i),u); |
71 |
|
|
if (r1 < ur[0]) ur[0] = r1; |
72 |
|
|
if (r1 > ur[1]) ur[1] = r1; |
73 |
|
|
r2 = DOT(VERTEX(fa,i),v); |
74 |
|
|
if (r2 < vr[0]) vr[0] = r2; |
75 |
|
|
if (r2 > vr[1]) vr[1] = r2; |
76 |
|
|
} |
77 |
|
|
dim[0] = random(); |
78 |
|
|
/* sample polygon */ |
79 |
|
|
nmisses = 0; |
80 |
|
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
81 |
|
|
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
82 |
|
|
for (i = 0; i < il->nsamps; i++) { |
83 |
|
|
/* random direction */ |
84 |
|
|
dim[3] = 1; |
85 |
|
|
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
86 |
|
|
dim[3] = 2; |
87 |
greg |
1.5 |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nazi; |
88 |
greg |
1.3 |
flatdir(dn, r1, r2); |
89 |
|
|
for (j = 0; j < 3; j++) |
90 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
91 |
greg |
1.3 |
/* random location */ |
92 |
|
|
do { |
93 |
|
|
dim[3] = 3; |
94 |
greg |
1.4 |
r1 = ur[0] + (ur[1]-ur[0]) * |
95 |
|
|
urand(urind(ilhash(dim,4),i+nmisses)); |
96 |
greg |
1.3 |
dim[3] = 4; |
97 |
greg |
1.4 |
r2 = vr[0] + (vr[1]-vr[0]) * |
98 |
|
|
urand(urind(ilhash(dim,4),i+nmisses)); |
99 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
100 |
|
|
org[j] = r1*u[j] + r2*v[j] |
101 |
|
|
+ fa->offset*fa->norm[j]; |
102 |
|
|
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
103 |
|
|
if (nmisses > MAXMISS) { |
104 |
|
|
objerror(ob, WARNING, "bad aspect"); |
105 |
|
|
rt->nrays = 0; |
106 |
|
|
freeface(ob); |
107 |
|
|
free((char *)distarr); |
108 |
|
|
o_default(ob, il, rt, nm); |
109 |
|
|
return; |
110 |
|
|
} |
111 |
|
|
for (j = 0; j < 3; j++) |
112 |
|
|
org[j] += .001*fa->norm[j]; |
113 |
|
|
/* send sample */ |
114 |
|
|
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
115 |
|
|
} |
116 |
|
|
rayflush(rt); |
117 |
greg |
1.4 |
/* write out the face w/ distribution */ |
118 |
|
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
119 |
|
|
illumout(il, ob); |
120 |
greg |
1.3 |
/* clean up */ |
121 |
|
|
freeface(ob); |
122 |
|
|
free((char *)distarr); |
123 |
|
|
#undef MAXMISS |
124 |
greg |
1.2 |
} |
125 |
|
|
|
126 |
|
|
|
127 |
|
|
o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
128 |
greg |
1.3 |
register OBJREC *ob; |
129 |
greg |
1.2 |
struct illum_args *il; |
130 |
|
|
struct rtproc *rt; |
131 |
|
|
char *nm; |
132 |
|
|
{ |
133 |
|
|
int dim[4]; |
134 |
|
|
int n, nalt, nazi; |
135 |
|
|
float *distarr; |
136 |
greg |
1.5 |
double r1, r2, r3; |
137 |
greg |
1.4 |
FVECT org, dir; |
138 |
greg |
1.2 |
FVECT u, v; |
139 |
|
|
register int i, j; |
140 |
|
|
/* check arguments */ |
141 |
|
|
if (ob->oargs.nfargs != 4) |
142 |
|
|
objerror(ob, USER, "bad # of arguments"); |
143 |
|
|
/* set up sampling */ |
144 |
|
|
n = 4.*PI * il->sampdens; |
145 |
|
|
nalt = sqrt(n/PI) + .5; |
146 |
|
|
nazi = PI*nalt + .5; |
147 |
|
|
n = nalt*nazi; |
148 |
|
|
distarr = (float *)calloc(n, 3*sizeof(float)); |
149 |
|
|
if (distarr == NULL) |
150 |
|
|
error(SYSTEM, "out of memory in o_sphere"); |
151 |
|
|
dim[0] = random(); |
152 |
|
|
/* sample sphere */ |
153 |
|
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
154 |
greg |
1.5 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) { |
155 |
|
|
if (il->nsamps > 2 && nazi > 20) { |
156 |
|
|
rounddir(dir, (dim[1]+.5)/nalt, (dim[2]+.5)/nazi); |
157 |
|
|
mkaxes(u, v, dir); |
158 |
|
|
} |
159 |
greg |
1.2 |
for (i = 0; i < il->nsamps; i++) { |
160 |
|
|
/* random direction */ |
161 |
|
|
dim[3] = 1; |
162 |
|
|
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
163 |
|
|
dim[3] = 2; |
164 |
greg |
1.5 |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nazi; |
165 |
greg |
1.2 |
rounddir(dir, r1, r2); |
166 |
|
|
/* random location */ |
167 |
greg |
1.5 |
if (il->nsamps <= 2 || nazi <= 20) |
168 |
|
|
mkaxes(u, v, dir); /* yuck! */ |
169 |
greg |
1.2 |
dim[3] = 3; |
170 |
greg |
1.5 |
r3 = sqrt(urand(urind(ilhash(dim,4),i))); |
171 |
greg |
1.2 |
dim[3] = 4; |
172 |
|
|
r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
173 |
greg |
1.5 |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
174 |
|
|
r2 = r3*ob->oargs.farg[3]*sin(r2); |
175 |
|
|
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
176 |
|
|
for (j = 0; j < 3; j++) { |
177 |
|
|
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
178 |
|
|
r3*dir[j]; |
179 |
|
|
dir[j] = -dir[j]; |
180 |
|
|
} |
181 |
greg |
1.2 |
/* send sample */ |
182 |
|
|
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
183 |
|
|
} |
184 |
greg |
1.5 |
} |
185 |
greg |
1.2 |
rayflush(rt); |
186 |
greg |
1.4 |
/* write out the sphere w/ distribution */ |
187 |
|
|
roundout(il, distarr, nalt, nazi); |
188 |
|
|
illumout(il, ob); |
189 |
greg |
1.2 |
/* clean up */ |
190 |
|
|
free((char *)distarr); |
191 |
|
|
} |
192 |
|
|
|
193 |
|
|
|
194 |
|
|
o_ring(ob, il, rt, nm) /* make an illum ring */ |
195 |
|
|
OBJREC *ob; |
196 |
|
|
struct illum_args *il; |
197 |
|
|
struct rtproc *rt; |
198 |
|
|
char *nm; |
199 |
|
|
{ |
200 |
greg |
1.3 |
int dim[4]; |
201 |
|
|
int n, nalt, nazi; |
202 |
|
|
float *distarr; |
203 |
greg |
1.5 |
double r1, r2, r3; |
204 |
greg |
1.4 |
FVECT dn, org, dir; |
205 |
greg |
1.3 |
FVECT u, v; |
206 |
|
|
register CONE *co; |
207 |
|
|
register int i, j; |
208 |
|
|
/* get/check arguments */ |
209 |
|
|
co = getcone(ob, 0); |
210 |
|
|
/* set up sampling */ |
211 |
|
|
n = PI * il->sampdens; |
212 |
|
|
nalt = sqrt(n/PI) + .5; |
213 |
|
|
nazi = PI*nalt + .5; |
214 |
|
|
n = nalt*nazi; |
215 |
|
|
distarr = (float *)calloc(n, 3*sizeof(float)); |
216 |
|
|
if (distarr == NULL) |
217 |
|
|
error(SYSTEM, "out of memory in o_ring"); |
218 |
|
|
mkaxes(u, v, co->ad); |
219 |
|
|
dim[0] = random(); |
220 |
|
|
/* sample disk */ |
221 |
|
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
222 |
|
|
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
223 |
|
|
for (i = 0; i < il->nsamps; i++) { |
224 |
|
|
/* random direction */ |
225 |
|
|
dim[3] = 1; |
226 |
|
|
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
227 |
|
|
dim[3] = 2; |
228 |
|
|
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
229 |
|
|
flatdir(dn, r1, r2); |
230 |
|
|
for (j = 0; j < 3; j++) |
231 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
232 |
greg |
1.3 |
/* random location */ |
233 |
|
|
dim[3] = 3; |
234 |
greg |
1.5 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
235 |
greg |
1.3 |
urand(urind(ilhash(dim,4),i))* |
236 |
|
|
(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
237 |
|
|
dim[3] = 4; |
238 |
|
|
r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
239 |
greg |
1.5 |
r1 = r3*cos(r2); |
240 |
|
|
r2 = r3*sin(r2); |
241 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
242 |
greg |
1.5 |
org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
243 |
|
|
.001*co->ad[j]; |
244 |
greg |
1.3 |
|
245 |
|
|
/* send sample */ |
246 |
|
|
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
247 |
|
|
} |
248 |
|
|
rayflush(rt); |
249 |
greg |
1.4 |
/* write out the ring w/ distribution */ |
250 |
|
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
251 |
|
|
illumout(il, ob); |
252 |
greg |
1.3 |
/* clean up */ |
253 |
|
|
freecone(ob); |
254 |
|
|
free((char *)distarr); |
255 |
greg |
1.2 |
} |
256 |
|
|
|
257 |
|
|
|
258 |
|
|
raysamp(res, org, dir, rt) /* compute a ray sample */ |
259 |
|
|
float res[3]; |
260 |
|
|
FVECT org, dir; |
261 |
|
|
register struct rtproc *rt; |
262 |
|
|
{ |
263 |
|
|
register float *fp; |
264 |
|
|
|
265 |
|
|
if (rt->nrays == rt->bsiz) |
266 |
|
|
rayflush(rt); |
267 |
|
|
rt->dest[rt->nrays] = res; |
268 |
|
|
fp = rt->buf + 6*rt->nrays++; |
269 |
|
|
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
270 |
|
|
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
271 |
|
|
} |
272 |
|
|
|
273 |
|
|
|
274 |
|
|
rayflush(rt) /* flush buffered rays */ |
275 |
|
|
register struct rtproc *rt; |
276 |
|
|
{ |
277 |
|
|
register int i; |
278 |
|
|
|
279 |
|
|
if (rt->nrays <= 0) |
280 |
|
|
return; |
281 |
|
|
i = 6*rt->nrays + 3; |
282 |
|
|
rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.; |
283 |
|
|
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
284 |
|
|
3*sizeof(float)*rt->nrays, |
285 |
|
|
6*sizeof(float)*(rt->nrays+1)) < |
286 |
|
|
3*sizeof(float)*rt->nrays ) |
287 |
|
|
error(SYSTEM, "error reading from rtrace process"); |
288 |
|
|
i = rt->nrays; |
289 |
|
|
while (i--) { |
290 |
|
|
rt->dest[i][0] += rt->buf[3*i]; |
291 |
|
|
rt->dest[i][1] += rt->buf[3*i+1]; |
292 |
|
|
rt->dest[i][2] += rt->buf[3*i+2]; |
293 |
|
|
} |
294 |
|
|
rt->nrays = 0; |
295 |
greg |
1.4 |
} |
296 |
|
|
|
297 |
|
|
|
298 |
|
|
mkaxes(u, v, n) /* compute u and v to go with n */ |
299 |
|
|
FVECT u, v, n; |
300 |
|
|
{ |
301 |
|
|
register int i; |
302 |
|
|
|
303 |
|
|
v[0] = v[1] = v[2] = 0.0; |
304 |
|
|
for (i = 0; i < 3; i++) |
305 |
|
|
if (n[i] < 0.6 && n[i] > -0.6) |
306 |
|
|
break; |
307 |
|
|
v[i] = 1.0; |
308 |
|
|
fcross(u, v, n); |
309 |
|
|
normalize(u); |
310 |
|
|
fcross(v, n, u); |
311 |
|
|
} |
312 |
|
|
|
313 |
|
|
|
314 |
|
|
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
315 |
|
|
register FVECT dv; |
316 |
|
|
double alt, azi; |
317 |
|
|
{ |
318 |
|
|
double d1, d2; |
319 |
|
|
|
320 |
|
|
dv[2] = 1. - 2.*alt; |
321 |
|
|
d1 = sqrt(1. - dv[2]*dv[2]); |
322 |
|
|
d2 = 2.*PI * azi; |
323 |
|
|
dv[0] = d1*cos(d2); |
324 |
|
|
dv[1] = d1*sin(d2); |
325 |
|
|
} |
326 |
|
|
|
327 |
|
|
|
328 |
|
|
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
329 |
|
|
register FVECT dv; |
330 |
|
|
double alt, azi; |
331 |
|
|
{ |
332 |
|
|
double d1, d2; |
333 |
|
|
|
334 |
|
|
d1 = sqrt(alt); |
335 |
|
|
d2 = 2.*PI * azi; |
336 |
|
|
dv[0] = d1*cos(d2); |
337 |
|
|
dv[1] = d1*sin(d2); |
338 |
greg |
1.6 |
dv[2] = sqrt(1. - alt); |
339 |
greg |
1.1 |
} |