13 |
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#include "random.h" |
14 |
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|
15 |
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|
16 |
< |
int o_default(FUN_ARGLIST); |
17 |
< |
int o_face(FUN_ARGLIST); |
18 |
< |
int o_sphere(FUN_ARGLIST); |
19 |
< |
int o_ring(FUN_ARGLIST); |
20 |
< |
void raysamp(float res[3], FVECT org, FVECT dir, struct rtproc *rt); |
21 |
< |
void rayflush(struct rtproc *rt); |
22 |
< |
void mkaxes(FVECT u, FVECT v, FVECT n); |
23 |
< |
void rounddir(FVECT dv, double alt, double azi); |
24 |
< |
void flatdir(FVECT dv, double alt, double azi); |
16 |
> |
COLORV * distarr = NULL; /* distribution array */ |
17 |
> |
int distsiz = 0; |
18 |
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|
19 |
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|
20 |
< |
int /* XXX type conflict with otypes.h */ |
21 |
< |
o_default( /* default illum action */ |
20 |
> |
void |
21 |
> |
newdist( /* allocate & clear distribution array */ |
22 |
> |
int siz |
23 |
> |
) |
24 |
> |
{ |
25 |
> |
if (siz == 0) { |
26 |
> |
if (distsiz > 0) |
27 |
> |
free((void *)distarr); |
28 |
> |
distarr = NULL; |
29 |
> |
distsiz = 0; |
30 |
> |
return; |
31 |
> |
} |
32 |
> |
if (distsiz < siz) { |
33 |
> |
if (distsiz > 0) |
34 |
> |
free((void *)distarr); |
35 |
> |
distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
36 |
> |
if (distarr == NULL) |
37 |
> |
error(SYSTEM, "out of memory in newdist"); |
38 |
> |
distsiz = siz; |
39 |
> |
} |
40 |
> |
memset(distarr, '\0', sizeof(COLOR)*siz); |
41 |
> |
} |
42 |
> |
|
43 |
> |
|
44 |
> |
int |
45 |
> |
process_ray(RAY *r, int rv) |
46 |
> |
{ |
47 |
> |
COLORV *colp; |
48 |
> |
|
49 |
> |
if (rv == 0) |
50 |
> |
return(0); |
51 |
> |
if (rv < 0) |
52 |
> |
error(USER, "ray tracing process died"); |
53 |
> |
if (r->rno >= distsiz) |
54 |
> |
error(INTERNAL, "bad returned index in process_ray"); |
55 |
> |
colp = &distarr[r->rno * 3]; |
56 |
> |
addcolor(colp, r->rcol); |
57 |
> |
return(1); |
58 |
> |
} |
59 |
> |
|
60 |
> |
|
61 |
> |
void |
62 |
> |
raysamp( /* queue a ray sample */ |
63 |
> |
int ndx, |
64 |
> |
FVECT org, |
65 |
> |
FVECT dir |
66 |
> |
) |
67 |
> |
{ |
68 |
> |
RAY myRay; |
69 |
> |
int rv; |
70 |
> |
|
71 |
> |
if ((ndx < 0) | (ndx >= distsiz)) |
72 |
> |
error(INTERNAL, "bad index in raysamp"); |
73 |
> |
VCOPY(myRay.rorg, org); |
74 |
> |
VCOPY(myRay.rdir, dir); |
75 |
> |
myRay.rmax = .0; |
76 |
> |
rayorigin(&myRay, PRIMARY, NULL, NULL); |
77 |
> |
myRay.rno = ndx; |
78 |
> |
/* queue ray, check result */ |
79 |
> |
process_ray(&myRay, ray_pqueue(&myRay)); |
80 |
> |
} |
81 |
> |
|
82 |
> |
|
83 |
> |
void |
84 |
> |
rayclean() /* finish all pending rays */ |
85 |
> |
{ |
86 |
> |
RAY myRay; |
87 |
> |
|
88 |
> |
while (process_ray(&myRay, ray_presult(&myRay, 0))) |
89 |
> |
; |
90 |
> |
} |
91 |
> |
|
92 |
> |
|
93 |
> |
static void |
94 |
> |
mkaxes( /* compute u and v to go with n */ |
95 |
> |
FVECT u, |
96 |
> |
FVECT v, |
97 |
> |
FVECT n |
98 |
> |
) |
99 |
> |
{ |
100 |
> |
register int i; |
101 |
> |
|
102 |
> |
v[0] = v[1] = v[2] = 0.0; |
103 |
> |
for (i = 0; i < 3; i++) |
104 |
> |
if (n[i] < 0.6 && n[i] > -0.6) |
105 |
> |
break; |
106 |
> |
v[i] = 1.0; |
107 |
> |
fcross(u, v, n); |
108 |
> |
normalize(u); |
109 |
> |
fcross(v, n, u); |
110 |
> |
} |
111 |
> |
|
112 |
> |
|
113 |
> |
static void |
114 |
> |
rounddir( /* compute uniform spherical direction */ |
115 |
> |
register FVECT dv, |
116 |
> |
double alt, |
117 |
> |
double azi |
118 |
> |
) |
119 |
> |
{ |
120 |
> |
double d1, d2; |
121 |
> |
|
122 |
> |
dv[2] = 1. - 2.*alt; |
123 |
> |
d1 = sqrt(1. - dv[2]*dv[2]); |
124 |
> |
d2 = 2.*PI * azi; |
125 |
> |
dv[0] = d1*cos(d2); |
126 |
> |
dv[1] = d1*sin(d2); |
127 |
> |
} |
128 |
> |
|
129 |
> |
|
130 |
> |
static void |
131 |
> |
flatdir( /* compute uniform hemispherical direction */ |
132 |
> |
register FVECT dv, |
133 |
> |
double alt, |
134 |
> |
double azi |
135 |
> |
) |
136 |
> |
{ |
137 |
> |
double d1, d2; |
138 |
> |
|
139 |
> |
d1 = sqrt(alt); |
140 |
> |
d2 = 2.*PI * azi; |
141 |
> |
dv[0] = d1*cos(d2); |
142 |
> |
dv[1] = d1*sin(d2); |
143 |
> |
dv[2] = sqrt(1. - alt); |
144 |
> |
} |
145 |
> |
|
146 |
> |
|
147 |
> |
int |
148 |
> |
my_default( /* default illum action */ |
149 |
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OBJREC *ob, |
150 |
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struct illum_args *il, |
31 |
– |
struct rtproc *rt, |
151 |
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char *nm |
152 |
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) |
153 |
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{ |
160 |
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|
161 |
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|
162 |
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int |
163 |
< |
o_face( /* make an illum face */ |
163 |
> |
my_face( /* make an illum face */ |
164 |
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OBJREC *ob, |
165 |
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struct illum_args *il, |
47 |
– |
struct rtproc *rt, |
166 |
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char *nm |
167 |
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) |
168 |
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{ |
169 |
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#define MAXMISS (5*n*il->nsamps) |
170 |
< |
int dim[3]; |
171 |
< |
int n, nalt, nazi, h; |
54 |
< |
float *distarr; |
170 |
> |
int dim[2]; |
171 |
> |
int n, nalt, nazi, h, alti; |
172 |
|
double sp[2], r1, r2; |
173 |
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FVECT dn, org, dir; |
174 |
|
FVECT u, v; |
175 |
|
double ur[2], vr[2]; |
176 |
+ |
MAT4 xfm; |
177 |
|
int nmisses; |
178 |
< |
register FACE *fa; |
178 |
> |
FACE *fa; |
179 |
|
register int i, j; |
180 |
|
/* get/check arguments */ |
181 |
|
fa = getface(ob); |
182 |
|
if (fa->area == 0.0) { |
183 |
|
freeface(ob); |
184 |
< |
return(o_default(ob, il, rt, nm)); |
184 |
> |
return(my_default(ob, il, nm)); |
185 |
|
} |
186 |
|
/* set up sampling */ |
187 |
< |
if (il->sampdens <= 0) |
188 |
< |
nalt = nazi = 1; |
189 |
< |
else { |
190 |
< |
n = PI * il->sampdens; |
191 |
< |
nalt = sqrt(n/PI) + .5; |
192 |
< |
nazi = PI*nalt + .5; |
187 |
> |
if (il->sd != NULL) { |
188 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
189 |
> |
objerror(ob, WARNING, "illegal up direction"); |
190 |
> |
freeface(ob); |
191 |
> |
return(my_default(ob, il, nm)); |
192 |
> |
} |
193 |
> |
n = il->sd->ninc; |
194 |
> |
} else { |
195 |
> |
if (il->sampdens <= 0) { |
196 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
197 |
> |
} else { |
198 |
> |
n = PI * il->sampdens; |
199 |
> |
nalt = sqrt(n/PI) + .5; |
200 |
> |
nazi = PI*nalt + .5; |
201 |
> |
} |
202 |
> |
n = nazi*nalt; |
203 |
|
} |
204 |
< |
n = nalt*nazi; |
205 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
78 |
< |
if (distarr == NULL) |
79 |
< |
error(SYSTEM, "out of memory in o_face"); |
80 |
< |
/* take first edge longer than sqrt(area) */ |
204 |
> |
newdist(n); |
205 |
> |
/* take first edge >= sqrt(area) */ |
206 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
207 |
|
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
208 |
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
230 |
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dim[0] = random(); |
231 |
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/* sample polygon */ |
232 |
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nmisses = 0; |
233 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
109 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
233 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
234 |
|
for (i = 0; i < il->nsamps; i++) { |
235 |
|
/* random direction */ |
236 |
< |
h = ilhash(dim, 3) + i; |
237 |
< |
multisamp(sp, 2, urand(h)); |
238 |
< |
r1 = (dim[1] + sp[0])/nalt; |
239 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
240 |
< |
flatdir(dn, r1, r2); |
241 |
< |
for (j = 0; j < 3; j++) |
242 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
236 |
> |
h = ilhash(dim, 2) + i; |
237 |
> |
if (il->sd != NULL) { |
238 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
239 |
> |
} else { |
240 |
> |
multisamp(sp, 2, urand(h)); |
241 |
> |
alti = dim[1]/nazi; |
242 |
> |
r1 = (alti + sp[0])/nalt; |
243 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
244 |
> |
flatdir(dn, r1, r2); |
245 |
> |
for (j = 0; j < 3; j++) |
246 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
247 |
> |
dn[2]*fa->norm[j]; |
248 |
> |
} |
249 |
|
/* random location */ |
250 |
|
do { |
251 |
|
multisamp(sp, 2, urand(h+4862+nmisses)); |
257 |
|
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
258 |
|
if (nmisses > MAXMISS) { |
259 |
|
objerror(ob, WARNING, "bad aspect"); |
260 |
< |
rt->nrays = 0; |
260 |
> |
rayclean(); |
261 |
|
freeface(ob); |
262 |
< |
free((void *)distarr); |
133 |
< |
return(o_default(ob, il, rt, nm)); |
262 |
> |
return(my_default(ob, il, nm)); |
263 |
|
} |
264 |
+ |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
265 |
+ |
r1 = -1.0001*il->thick - .0001; |
266 |
+ |
else |
267 |
+ |
r1 = .0001; |
268 |
|
for (j = 0; j < 3; j++) |
269 |
< |
org[j] += .001*fa->norm[j]; |
269 |
> |
org[j] += r1*fa->norm[j]; |
270 |
|
/* send sample */ |
271 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
271 |
> |
raysamp(dim[1], org, dir); |
272 |
|
} |
273 |
< |
rayflush(rt); |
273 |
> |
rayclean(); |
274 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
275 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
276 |
> |
nazi = PI*nalt + .5; |
277 |
> |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
278 |
> |
} |
279 |
|
/* write out the face and its distribution */ |
280 |
< |
if (average(il, distarr, nalt*nazi)) { |
280 |
> |
if (average(il, distarr, n)) { |
281 |
|
if (il->sampdens > 0) |
282 |
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
283 |
|
illumout(il, ob); |
285 |
|
printobj(il->altmat, ob); |
286 |
|
/* clean up */ |
287 |
|
freeface(ob); |
288 |
< |
free((void *)distarr); |
288 |
> |
return(0); |
289 |
|
#undef MAXMISS |
152 |
– |
/* XXX we need to return something here. what is it? */ |
290 |
|
} |
291 |
|
|
292 |
|
|
293 |
|
int |
294 |
< |
o_sphere( /* make an illum sphere */ |
294 |
> |
my_sphere( /* make an illum sphere */ |
295 |
|
register OBJREC *ob, |
296 |
|
struct illum_args *il, |
160 |
– |
struct rtproc *rt, |
297 |
|
char *nm |
298 |
|
) |
299 |
|
{ |
300 |
|
int dim[3]; |
301 |
|
int n, nalt, nazi; |
166 |
– |
float *distarr; |
302 |
|
double sp[4], r1, r2, r3; |
303 |
|
FVECT org, dir; |
304 |
|
FVECT u, v; |
314 |
|
nalt = sqrt(2./PI*n) + .5; |
315 |
|
nazi = PI/2.*nalt + .5; |
316 |
|
} |
317 |
+ |
if (il->sd != NULL) |
318 |
+ |
objerror(ob, WARNING, "BSDF ignored"); |
319 |
|
n = nalt*nazi; |
320 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
184 |
< |
if (distarr == NULL) |
185 |
< |
error(SYSTEM, "out of memory in o_sphere"); |
320 |
> |
newdist(n); |
321 |
|
dim[0] = random(); |
322 |
|
/* sample sphere */ |
323 |
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
342 |
|
dir[j] = -dir[j]; |
343 |
|
} |
344 |
|
/* send sample */ |
345 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
345 |
> |
raysamp(dim[1]*nazi+dim[2], org, dir); |
346 |
|
} |
347 |
< |
rayflush(rt); |
347 |
> |
rayclean(); |
348 |
|
/* write out the sphere and its distribution */ |
349 |
< |
if (average(il, distarr, nalt*nazi)) { |
349 |
> |
if (average(il, distarr, n)) { |
350 |
|
if (il->sampdens > 0) |
351 |
|
roundout(il, distarr, nalt, nazi); |
352 |
|
else |
355 |
|
} else |
356 |
|
printobj(il->altmat, ob); |
357 |
|
/* clean up */ |
223 |
– |
free((void *)distarr); |
358 |
|
return(1); |
359 |
|
} |
360 |
|
|
361 |
|
|
362 |
|
int |
363 |
< |
o_ring( /* make an illum ring */ |
363 |
> |
my_ring( /* make an illum ring */ |
364 |
|
OBJREC *ob, |
365 |
|
struct illum_args *il, |
232 |
– |
struct rtproc *rt, |
366 |
|
char *nm |
367 |
|
) |
368 |
|
{ |
369 |
< |
int dim[3]; |
370 |
< |
int n, nalt, nazi; |
371 |
< |
float *distarr; |
372 |
< |
double sp[4], r1, r2, r3; |
369 |
> |
int dim[2]; |
370 |
> |
int n, nalt, nazi, alti; |
371 |
> |
double sp[2], r1, r2, r3; |
372 |
> |
int h; |
373 |
|
FVECT dn, org, dir; |
374 |
|
FVECT u, v; |
375 |
< |
register CONE *co; |
375 |
> |
MAT4 xfm; |
376 |
> |
CONE *co; |
377 |
|
register int i, j; |
378 |
|
/* get/check arguments */ |
379 |
|
co = getcone(ob, 0); |
380 |
|
/* set up sampling */ |
381 |
< |
if (il->sampdens <= 0) |
382 |
< |
nalt = nazi = 1; |
383 |
< |
else { |
384 |
< |
n = PI * il->sampdens; |
385 |
< |
nalt = sqrt(n/PI) + .5; |
386 |
< |
nazi = PI*nalt + .5; |
381 |
> |
if (il->sd != NULL) { |
382 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
383 |
> |
objerror(ob, WARNING, "illegal up direction"); |
384 |
> |
freecone(ob); |
385 |
> |
return(my_default(ob, il, nm)); |
386 |
> |
} |
387 |
> |
n = il->sd->ninc; |
388 |
> |
} else { |
389 |
> |
if (il->sampdens <= 0) { |
390 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
391 |
> |
} else { |
392 |
> |
n = PI * il->sampdens; |
393 |
> |
nalt = sqrt(n/PI) + .5; |
394 |
> |
nazi = PI*nalt + .5; |
395 |
> |
} |
396 |
> |
n = nazi*nalt; |
397 |
|
} |
398 |
< |
n = nalt*nazi; |
255 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
256 |
< |
if (distarr == NULL) |
257 |
< |
error(SYSTEM, "out of memory in o_ring"); |
398 |
> |
newdist(n); |
399 |
|
mkaxes(u, v, co->ad); |
400 |
|
dim[0] = random(); |
401 |
|
/* sample disk */ |
402 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
262 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
402 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
403 |
|
for (i = 0; i < il->nsamps; i++) { |
404 |
|
/* next sample point */ |
405 |
< |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
405 |
> |
h = ilhash(dim,2) + i; |
406 |
|
/* random direction */ |
407 |
< |
r1 = (dim[1] + sp[0])/nalt; |
408 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
409 |
< |
flatdir(dn, r1, r2); |
410 |
< |
for (j = 0; j < 3; j++) |
407 |
> |
if (il->sd != NULL) { |
408 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
409 |
> |
} else { |
410 |
> |
multisamp(sp, 2, urand(h)); |
411 |
> |
alti = dim[1]/nazi; |
412 |
> |
r1 = (alti + sp[0])/nalt; |
413 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
414 |
> |
flatdir(dn, r1, r2); |
415 |
> |
for (j = 0; j < 3; j++) |
416 |
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
417 |
+ |
} |
418 |
|
/* random location */ |
419 |
+ |
multisamp(sp, 2, urand(h+8371)); |
420 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
421 |
< |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
422 |
< |
r2 = 2.*PI*sp[3]; |
421 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
422 |
> |
r2 = 2.*PI*sp[1]; |
423 |
|
r1 = r3*cos(r2); |
424 |
|
r2 = r3*sin(r2); |
425 |
+ |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
426 |
+ |
r3 = -1.0001*il->thick - .0001; |
427 |
+ |
else |
428 |
+ |
r3 = .0001; |
429 |
|
for (j = 0; j < 3; j++) |
430 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
431 |
< |
.001*co->ad[j]; |
281 |
< |
|
431 |
> |
r3*co->ad[j]; |
432 |
|
/* send sample */ |
433 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
433 |
> |
raysamp(dim[1], org, dir); |
434 |
|
} |
435 |
< |
rayflush(rt); |
435 |
> |
rayclean(); |
436 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
437 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
438 |
> |
nazi = PI*nalt + .5; |
439 |
> |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
440 |
> |
} |
441 |
|
/* write out the ring and its distribution */ |
442 |
< |
if (average(il, distarr, nalt*nazi)) { |
442 |
> |
if (average(il, distarr, n)) { |
443 |
|
if (il->sampdens > 0) |
444 |
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
445 |
|
illumout(il, ob); |
447 |
|
printobj(il->altmat, ob); |
448 |
|
/* clean up */ |
449 |
|
freecone(ob); |
295 |
– |
free((void *)distarr); |
450 |
|
return(1); |
297 |
– |
} |
298 |
– |
|
299 |
– |
|
300 |
– |
void |
301 |
– |
raysamp( /* compute a ray sample */ |
302 |
– |
float res[3], |
303 |
– |
FVECT org, |
304 |
– |
FVECT dir, |
305 |
– |
register struct rtproc *rt |
306 |
– |
) |
307 |
– |
{ |
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 |
– |
void |
320 |
– |
rayflush( /* flush buffered rays */ |
321 |
– |
register struct rtproc *rt |
322 |
– |
) |
323 |
– |
{ |
324 |
– |
register int i; |
325 |
– |
|
326 |
– |
if (rt->nrays <= 0) |
327 |
– |
return; |
328 |
– |
memset(rt->buf+6*rt->nrays, '\0', 6*sizeof(float)); |
329 |
– |
errno = 0; |
330 |
– |
if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, |
331 |
– |
3*sizeof(float)*(rt->nrays+1), |
332 |
– |
6*sizeof(float)*(rt->nrays+1)) < |
333 |
– |
3*sizeof(float)*(rt->nrays+1) ) |
334 |
– |
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 |
– |
} |
343 |
– |
|
344 |
– |
|
345 |
– |
void |
346 |
– |
mkaxes( /* compute u and v to go with n */ |
347 |
– |
FVECT u, |
348 |
– |
FVECT v, |
349 |
– |
FVECT n |
350 |
– |
) |
351 |
– |
{ |
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 |
– |
void |
366 |
– |
rounddir( /* compute uniform spherical direction */ |
367 |
– |
register FVECT dv, |
368 |
– |
double alt, |
369 |
– |
double azi |
370 |
– |
) |
371 |
– |
{ |
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 |
– |
void |
383 |
– |
flatdir( /* compute uniform hemispherical direction */ |
384 |
– |
register FVECT dv, |
385 |
– |
double alt, |
386 |
– |
double azi |
387 |
– |
) |
388 |
– |
{ |
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 |
– |
dv[2] = sqrt(1. - alt); |
451 |
|
} |