5 |
|
#endif |
6 |
|
|
7 |
|
/* |
8 |
< |
* Routines to do the actual calcultion and output for mkillum |
8 |
> |
* Routines to do the actual calculation for mkillum |
9 |
|
*/ |
10 |
|
|
11 |
|
#include "mkillum.h" |
17 |
|
#include "random.h" |
18 |
|
|
19 |
|
|
20 |
– |
printobj(mod, obj) /* print out an object */ |
21 |
– |
char *mod; |
22 |
– |
register OBJREC *obj; |
23 |
– |
{ |
24 |
– |
register int i; |
25 |
– |
|
26 |
– |
printf("\n%s %s %s", mod, ofun[obj->otype].funame, obj->oname); |
27 |
– |
printf("\n%d", obj->oargs.nsargs); |
28 |
– |
for (i = 0; i < obj->oargs.nsargs; i++) |
29 |
– |
printf(" %s", obj->oargs.sarg[i]); |
30 |
– |
#ifdef IARGS |
31 |
– |
printf("\n%d", obj->oargs.niargs); |
32 |
– |
for (i = 0; i < obj->oargs.niargs; i++) |
33 |
– |
printf(" %d", obj->oargs.iarg[i]); |
34 |
– |
#else |
35 |
– |
printf("\n0"); |
36 |
– |
#endif |
37 |
– |
printf("\n%d", obj->oargs.nfargs); |
38 |
– |
for (i = 0; i < obj->oargs.nfargs; i++) { |
39 |
– |
if (i%3 == 0) |
40 |
– |
putchar('\n'); |
41 |
– |
printf(" %18.12g", obj->oargs.farg[i]); |
42 |
– |
} |
43 |
– |
putchar('\n'); |
44 |
– |
} |
45 |
– |
|
46 |
– |
|
20 |
|
o_default(ob, il, rt, nm) /* default illum action */ |
21 |
|
OBJREC *ob; |
22 |
|
struct illum_args *il; |
26 |
|
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)) |
57 |
< |
printobj(il->altname, ob); |
29 |
> |
printobj(il->altmat, ob); |
30 |
|
} |
31 |
|
|
32 |
|
|
36 |
|
struct rtproc *rt; |
37 |
|
char *nm; |
38 |
|
{ |
39 |
+ |
#define MAXMISS (5*n*il->nsamps) |
40 |
+ |
int dim[3]; |
41 |
+ |
int n, nalt, nazi, h; |
42 |
+ |
float *distarr; |
43 |
+ |
double sp[2], r1, r2; |
44 |
+ |
FVECT dn, org, dir; |
45 |
+ |
FVECT u, v; |
46 |
+ |
double ur[2], vr[2]; |
47 |
+ |
int nmisses; |
48 |
+ |
register FACE *fa; |
49 |
+ |
register int i, j; |
50 |
+ |
/* get/check arguments */ |
51 |
+ |
fa = getface(ob); |
52 |
+ |
if (fa->area == 0.0) { |
53 |
+ |
freeface(ob); |
54 |
+ |
o_default(ob, il, rt, nm); |
55 |
+ |
return; |
56 |
+ |
} |
57 |
+ |
/* set up sampling */ |
58 |
+ |
if (il->sampdens <= 0) |
59 |
+ |
nalt = nazi = 1; |
60 |
+ |
else { |
61 |
+ |
n = PI * il->sampdens; |
62 |
+ |
nalt = sqrt(n/PI) + .5; |
63 |
+ |
nazi = PI*nalt + .5; |
64 |
+ |
} |
65 |
+ |
n = nalt*nazi; |
66 |
+ |
distarr = (float *)calloc(n, 3*sizeof(float)); |
67 |
+ |
if (distarr == NULL) |
68 |
+ |
error(SYSTEM, "out of memory in o_face"); |
69 |
+ |
/* take first edge longer than sqrt(area) */ |
70 |
+ |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
71 |
+ |
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
72 |
+ |
u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
73 |
+ |
u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
74 |
+ |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
75 |
+ |
break; |
76 |
+ |
} |
77 |
+ |
if (i < fa->nv) { /* got one! -- let's align our axes */ |
78 |
+ |
r2 = 1.0/sqrt(r1); |
79 |
+ |
u[0] *= r2; u[1] *= r2; u[2] *= r2; |
80 |
+ |
fcross(v, fa->norm, u); |
81 |
+ |
} else /* oh well, we'll just have to wing it */ |
82 |
+ |
mkaxes(u, v, fa->norm); |
83 |
+ |
/* now, find limits in (u,v) coordinates */ |
84 |
+ |
ur[0] = vr[0] = FHUGE; |
85 |
+ |
ur[1] = vr[1] = -FHUGE; |
86 |
+ |
for (i = 0; i < fa->nv; i++) { |
87 |
+ |
r1 = DOT(VERTEX(fa,i),u); |
88 |
+ |
if (r1 < ur[0]) ur[0] = r1; |
89 |
+ |
if (r1 > ur[1]) ur[1] = r1; |
90 |
+ |
r2 = DOT(VERTEX(fa,i),v); |
91 |
+ |
if (r2 < vr[0]) vr[0] = r2; |
92 |
+ |
if (r2 > vr[1]) vr[1] = r2; |
93 |
+ |
} |
94 |
+ |
dim[0] = random(); |
95 |
+ |
/* sample polygon */ |
96 |
+ |
nmisses = 0; |
97 |
+ |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
98 |
+ |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
99 |
+ |
for (i = 0; i < il->nsamps; i++) { |
100 |
+ |
/* random direction */ |
101 |
+ |
h = ilhash(dim, 3) + i; |
102 |
+ |
multisamp(sp, 2, urand(h)); |
103 |
+ |
r1 = (dim[1] + sp[0])/nalt; |
104 |
+ |
r2 = (dim[2] + sp[1] - .5)/nazi; |
105 |
+ |
flatdir(dn, r1, r2); |
106 |
+ |
for (j = 0; j < 3; j++) |
107 |
+ |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
108 |
+ |
/* random location */ |
109 |
+ |
do { |
110 |
+ |
multisamp(sp, 2, urand(h+4862+nmisses)); |
111 |
+ |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
112 |
+ |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
113 |
+ |
for (j = 0; j < 3; j++) |
114 |
+ |
org[j] = r1*u[j] + r2*v[j] |
115 |
+ |
+ fa->offset*fa->norm[j]; |
116 |
+ |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
117 |
+ |
if (nmisses > MAXMISS) { |
118 |
+ |
objerror(ob, WARNING, "bad aspect"); |
119 |
+ |
rt->nrays = 0; |
120 |
+ |
freeface(ob); |
121 |
+ |
free((char *)distarr); |
122 |
+ |
o_default(ob, il, rt, nm); |
123 |
+ |
return; |
124 |
+ |
} |
125 |
+ |
for (j = 0; j < 3; j++) |
126 |
+ |
org[j] += .001*fa->norm[j]; |
127 |
+ |
/* send sample */ |
128 |
+ |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
129 |
+ |
} |
130 |
+ |
rayflush(rt); |
131 |
+ |
/* write out the face and its distribution */ |
132 |
+ |
if (average(il, distarr, nalt*nazi)) { |
133 |
+ |
if (il->sampdens > 0) |
134 |
+ |
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
135 |
+ |
illumout(il, ob); |
136 |
+ |
} else |
137 |
+ |
printobj(il->altmat, ob); |
138 |
+ |
/* clean up */ |
139 |
+ |
freeface(ob); |
140 |
+ |
free((char *)distarr); |
141 |
+ |
#undef MAXMISS |
142 |
|
} |
143 |
|
|
144 |
|
|
145 |
|
o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
146 |
< |
OBJREC *ob; |
146 |
> |
register OBJREC *ob; |
147 |
|
struct illum_args *il; |
148 |
|
struct rtproc *rt; |
149 |
|
char *nm; |
150 |
|
{ |
151 |
< |
int dim[4]; |
151 |
> |
int dim[3]; |
152 |
|
int n, nalt, nazi; |
153 |
|
float *distarr; |
154 |
< |
double r1, r2; |
155 |
< |
FVECT pos, dir; |
154 |
> |
double sp[4], r1, r2, r3; |
155 |
> |
FVECT org, dir; |
156 |
|
FVECT u, v; |
157 |
|
register int i, j; |
158 |
|
/* check arguments */ |
159 |
|
if (ob->oargs.nfargs != 4) |
160 |
|
objerror(ob, USER, "bad # of arguments"); |
161 |
|
/* set up sampling */ |
162 |
< |
n = 4.*PI * il->sampdens; |
163 |
< |
nalt = sqrt(n/PI) + .5; |
164 |
< |
nazi = PI*nalt + .5; |
162 |
> |
if (il->sampdens <= 0) |
163 |
> |
nalt = nazi = 1; |
164 |
> |
else { |
165 |
> |
n = 4.*PI * il->sampdens; |
166 |
> |
nalt = sqrt(n/PI) + .5; |
167 |
> |
nazi = PI*nalt + .5; |
168 |
> |
} |
169 |
|
n = nalt*nazi; |
170 |
|
distarr = (float *)calloc(n, 3*sizeof(float)); |
171 |
|
if (distarr == NULL) |
175 |
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
176 |
|
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
177 |
|
for (i = 0; i < il->nsamps; i++) { |
178 |
+ |
/* next sample point */ |
179 |
+ |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
180 |
|
/* random direction */ |
181 |
< |
dim[3] = 1; |
182 |
< |
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
102 |
< |
dim[3] = 2; |
103 |
< |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
181 |
> |
r1 = (dim[1] + sp[0])/nalt; |
182 |
> |
r2 = (dim[2] + sp[1] - .5)/nazi; |
183 |
|
rounddir(dir, r1, r2); |
184 |
|
/* random location */ |
185 |
|
mkaxes(u, v, dir); /* yuck! */ |
186 |
< |
dim[3] = 3; |
187 |
< |
r1 = sqrt(urand(urind(ilhash(dim,4),i))); |
188 |
< |
dim[3] = 4; |
189 |
< |
r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
190 |
< |
for (j = 0; j < 3; j++) |
191 |
< |
org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] * |
192 |
< |
( r1*cos(r2)*u[j] + r1*sin(r2)*v[j] |
193 |
< |
- sqrt(1.01-r1*r1)*dir[j] ); |
194 |
< |
|
186 |
> |
r3 = sqrt(sp[2]); |
187 |
> |
r2 = 2.*PI*sp[3]; |
188 |
> |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
189 |
> |
r2 = r3*ob->oargs.farg[3]*sin(r2); |
190 |
> |
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
191 |
> |
for (j = 0; j < 3; j++) { |
192 |
> |
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
193 |
> |
r3*dir[j]; |
194 |
> |
dir[j] = -dir[j]; |
195 |
> |
} |
196 |
|
/* send sample */ |
197 |
< |
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
197 |
> |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
198 |
|
} |
199 |
|
rayflush(rt); |
200 |
< |
/* write out distribution */ |
201 |
< |
rounddist(distarr, nalt, nazi, il, ob); |
200 |
> |
/* write out the sphere and its distribution */ |
201 |
> |
if (average(il, distarr, nalt*nazi)) { |
202 |
> |
if (il->sampdens > 0) |
203 |
> |
roundout(il, distarr, nalt, nazi); |
204 |
> |
else |
205 |
> |
objerror(ob, WARNING, "diffuse distribution"); |
206 |
> |
illumout(il, ob); |
207 |
> |
} else |
208 |
> |
printobj(il->altmat, ob); |
209 |
|
/* clean up */ |
210 |
|
free((char *)distarr); |
211 |
|
} |
217 |
|
struct rtproc *rt; |
218 |
|
char *nm; |
219 |
|
{ |
220 |
+ |
int dim[3]; |
221 |
+ |
int n, nalt, nazi; |
222 |
+ |
float *distarr; |
223 |
+ |
double sp[4], r1, r2, r3; |
224 |
+ |
FVECT dn, org, dir; |
225 |
+ |
FVECT u, v; |
226 |
+ |
register CONE *co; |
227 |
+ |
register int i, j; |
228 |
+ |
/* get/check arguments */ |
229 |
+ |
co = getcone(ob, 0); |
230 |
+ |
/* set up sampling */ |
231 |
+ |
if (il->sampdens <= 0) |
232 |
+ |
nalt = nazi = 1; |
233 |
+ |
else { |
234 |
+ |
n = PI * il->sampdens; |
235 |
+ |
nalt = sqrt(n/PI) + .5; |
236 |
+ |
nazi = PI*nalt + .5; |
237 |
+ |
} |
238 |
+ |
n = nalt*nazi; |
239 |
+ |
distarr = (float *)calloc(n, 3*sizeof(float)); |
240 |
+ |
if (distarr == NULL) |
241 |
+ |
error(SYSTEM, "out of memory in o_ring"); |
242 |
+ |
mkaxes(u, v, co->ad); |
243 |
+ |
dim[0] = random(); |
244 |
+ |
/* sample disk */ |
245 |
+ |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
246 |
+ |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
247 |
+ |
for (i = 0; i < il->nsamps; i++) { |
248 |
+ |
/* next sample point */ |
249 |
+ |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
250 |
+ |
/* random direction */ |
251 |
+ |
r1 = (dim[1] + sp[0])/nalt; |
252 |
+ |
r2 = (dim[2] + sp[1] - .5)/nazi; |
253 |
+ |
flatdir(dn, r1, r2); |
254 |
+ |
for (j = 0; j < 3; j++) |
255 |
+ |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
256 |
+ |
/* random location */ |
257 |
+ |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
258 |
+ |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
259 |
+ |
r2 = 2.*PI*sp[3]; |
260 |
+ |
r1 = r3*cos(r2); |
261 |
+ |
r2 = r3*sin(r2); |
262 |
+ |
for (j = 0; j < 3; j++) |
263 |
+ |
org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
264 |
+ |
.001*co->ad[j]; |
265 |
+ |
|
266 |
+ |
/* send sample */ |
267 |
+ |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
268 |
+ |
} |
269 |
+ |
rayflush(rt); |
270 |
+ |
/* write out the ring and its distribution */ |
271 |
+ |
if (average(il, distarr, nalt*nazi)) { |
272 |
+ |
if (il->sampdens > 0) |
273 |
+ |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
274 |
+ |
illumout(il, ob); |
275 |
+ |
} else |
276 |
+ |
printobj(il->altmat, ob); |
277 |
+ |
/* clean up */ |
278 |
+ |
freecone(ob); |
279 |
+ |
free((char *)distarr); |
280 |
|
} |
281 |
|
|
282 |
|
|
303 |
|
|
304 |
|
if (rt->nrays <= 0) |
305 |
|
return; |
306 |
< |
i = 6*rt->nrays + 3; |
307 |
< |
rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.; |
306 |
> |
bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
307 |
> |
errno = 0; |
308 |
|
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
309 |
|
3*sizeof(float)*rt->nrays, |
310 |
|
6*sizeof(float)*(rt->nrays+1)) < |
317 |
|
rt->dest[i][2] += rt->buf[3*i+2]; |
318 |
|
} |
319 |
|
rt->nrays = 0; |
320 |
+ |
} |
321 |
+ |
|
322 |
+ |
|
323 |
+ |
mkaxes(u, v, n) /* compute u and v to go with n */ |
324 |
+ |
FVECT u, v, n; |
325 |
+ |
{ |
326 |
+ |
register int i; |
327 |
+ |
|
328 |
+ |
v[0] = v[1] = v[2] = 0.0; |
329 |
+ |
for (i = 0; i < 3; i++) |
330 |
+ |
if (n[i] < 0.6 && n[i] > -0.6) |
331 |
+ |
break; |
332 |
+ |
v[i] = 1.0; |
333 |
+ |
fcross(u, v, n); |
334 |
+ |
normalize(u); |
335 |
+ |
fcross(v, n, u); |
336 |
+ |
} |
337 |
+ |
|
338 |
+ |
|
339 |
+ |
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
340 |
+ |
register FVECT dv; |
341 |
+ |
double alt, azi; |
342 |
+ |
{ |
343 |
+ |
double d1, d2; |
344 |
+ |
|
345 |
+ |
dv[2] = 1. - 2.*alt; |
346 |
+ |
d1 = sqrt(1. - dv[2]*dv[2]); |
347 |
+ |
d2 = 2.*PI * azi; |
348 |
+ |
dv[0] = d1*cos(d2); |
349 |
+ |
dv[1] = d1*sin(d2); |
350 |
+ |
} |
351 |
+ |
|
352 |
+ |
|
353 |
+ |
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
354 |
+ |
register FVECT dv; |
355 |
+ |
double alt, azi; |
356 |
+ |
{ |
357 |
+ |
double d1, d2; |
358 |
+ |
|
359 |
+ |
d1 = sqrt(alt); |
360 |
+ |
d2 = 2.*PI * azi; |
361 |
+ |
dv[0] = d1*cos(d2); |
362 |
+ |
dv[1] = d1*sin(d2); |
363 |
+ |
dv[2] = sqrt(1. - alt); |
364 |
|
} |