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root/radiance/ray/src/gen/mkillum2.c
Revision: 2.15
Committed: Tue Mar 30 20:40:04 2004 UTC (20 years ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.14: +2 -2 lines
Log Message:
ANSI-discovered fixes thanks to Schorsh

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.15 static const char RCSid[] = "$Id: mkillum2.c,v 2.14 2004/03/28 20:33:12 schorsch Exp $";
3 greg 1.1 #endif
4     /*
5 greg 1.4 * Routines to do the actual calculation for mkillum
6 greg 1.1 */
7    
8 schorsch 2.11 #include <string.h>
9    
10 greg 1.1 #include "mkillum.h"
11     #include "face.h"
12     #include "cone.h"
13 greg 1.2 #include "random.h"
14 greg 1.1
15 greg 2.13
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 schorsch 2.12 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);
25    
26    
27     int /* XXX type conflict with otypes.h */
28     o_default( /* default illum action */
29     OBJREC *ob,
30     struct illum_args *il,
31     struct rtproc *rt,
32     char *nm
33     )
34 greg 1.1 {
35 greg 1.2 sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"",
36     nm, ofun[ob->otype].funame, ob->oname);
37     error(WARNING, errmsg);
38 greg 2.2 printobj(il->altmat, ob);
39 greg 2.13 return(1);
40 greg 1.2 }
41    
42    
43 greg 2.13 int
44 schorsch 2.12 o_face( /* make an illum face */
45     OBJREC *ob,
46     struct illum_args *il,
47     struct rtproc *rt,
48     char *nm
49     )
50 greg 1.2 {
51 greg 1.3 #define MAXMISS (5*n*il->nsamps)
52 greg 1.10 int dim[3];
53     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     double ur[2], vr[2];
59     int nmisses;
60     register FACE *fa;
61     register int i, j;
62     /* get/check arguments */
63     fa = getface(ob);
64     if (fa->area == 0.0) {
65     freeface(ob);
66 greg 2.13 return(o_default(ob, il, rt, nm));
67 greg 1.3 }
68     /* set up sampling */
69 greg 1.11 if (il->sampdens <= 0)
70     nalt = nazi = 1;
71     else {
72     n = PI * il->sampdens;
73     nalt = sqrt(n/PI) + .5;
74     nazi = PI*nalt + .5;
75     }
76 greg 1.3 n = nalt*nazi;
77     distarr = (float *)calloc(n, 3*sizeof(float));
78     if (distarr == NULL)
79     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     u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0];
83     u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1];
84     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     }
88     if (i < fa->nv) { /* got one! -- let's align our axes */
89 greg 2.5 r2 = 1.0/sqrt(r1);
90     u[0] *= r2; u[1] *= r2; u[2] *= r2;
91 greg 2.3 fcross(v, fa->norm, u);
92     } else /* oh well, we'll just have to wing it */
93     mkaxes(u, v, fa->norm);
94     /* now, find limits in (u,v) coordinates */
95 greg 1.3 ur[0] = vr[0] = FHUGE;
96     ur[1] = vr[1] = -FHUGE;
97     for (i = 0; i < fa->nv; i++) {
98     r1 = DOT(VERTEX(fa,i),u);
99     if (r1 < ur[0]) ur[0] = r1;
100     if (r1 > ur[1]) ur[1] = r1;
101     r2 = DOT(VERTEX(fa,i),v);
102     if (r2 < vr[0]) vr[0] = r2;
103     if (r2 > vr[1]) vr[1] = r2;
104     }
105     dim[0] = random();
106     /* sample polygon */
107     nmisses = 0;
108     for (dim[1] = 0; dim[1] < nalt; dim[1]++)
109     for (dim[2] = 0; dim[2] < nazi; dim[2]++)
110     for (i = 0; i < il->nsamps; i++) {
111     /* 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     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     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     r2 = vr[0] + (vr[1]-vr[0]) * sp[1];
124 greg 1.3 for (j = 0; j < 3; j++)
125     org[j] = r1*u[j] + r2*v[j]
126     + fa->offset*fa->norm[j];
127     } while (!inface(org, fa) && nmisses++ < MAXMISS);
128     if (nmisses > MAXMISS) {
129     objerror(ob, WARNING, "bad aspect");
130     rt->nrays = 0;
131     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     for (j = 0; j < 3; j++)
136     org[j] += .001*fa->norm[j];
137     /* send sample */
138 greg 1.7 raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt);
139 greg 1.3 }
140     rayflush(rt);
141 greg 1.11 /* write out the face and its distribution */
142 greg 1.12 if (average(il, distarr, nalt*nazi)) {
143     if (il->sampdens > 0)
144     flatout(il, distarr, nalt, nazi, u, v, fa->norm);
145     illumout(il, ob);
146 greg 2.2 } else
147 greg 1.12 printobj(il->altmat, ob);
148 greg 1.3 /* clean up */
149     freeface(ob);
150 greg 2.9 free((void *)distarr);
151 greg 2.15 return(0);
152 greg 1.3 #undef MAXMISS
153 greg 1.2 }
154    
155    
156 greg 2.13 int
157 schorsch 2.12 o_sphere( /* make an illum sphere */
158     register OBJREC *ob,
159     struct illum_args *il,
160     struct rtproc *rt,
161     char *nm
162     )
163 greg 1.2 {
164 greg 1.10 int dim[3];
165 greg 1.2 int n, nalt, nazi;
166     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     register int i, j;
171     /* check arguments */
172     if (ob->oargs.nfargs != 4)
173     objerror(ob, USER, "bad # of arguments");
174     /* set up sampling */
175 greg 1.11 if (il->sampdens <= 0)
176     nalt = nazi = 1;
177     else {
178     n = 4.*PI * il->sampdens;
179 greg 2.7 nalt = sqrt(2./PI*n) + .5;
180     nazi = PI/2.*nalt + .5;
181 greg 1.11 }
182 greg 1.2 n = nalt*nazi;
183     distarr = (float *)calloc(n, 3*sizeof(float));
184     if (distarr == NULL)
185     error(SYSTEM, "out of memory in o_sphere");
186     dim[0] = random();
187     /* sample sphere */
188     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     /* random location */
198 greg 1.8 mkaxes(u, v, dir); /* yuck! */
199 greg 1.10 r3 = sqrt(sp[2]);
200     r2 = 2.*PI*sp[3];
201 greg 1.5 r1 = r3*ob->oargs.farg[3]*cos(r2);
202     r2 = r3*ob->oargs.farg[3]*sin(r2);
203     r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3);
204     for (j = 0; j < 3; j++) {
205     org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] +
206     r3*dir[j];
207     dir[j] = -dir[j];
208     }
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     rayflush(rt);
213 greg 1.11 /* write out the sphere and its distribution */
214 greg 1.12 if (average(il, distarr, nalt*nazi)) {
215     if (il->sampdens > 0)
216     roundout(il, distarr, nalt, nazi);
217     else
218     objerror(ob, WARNING, "diffuse distribution");
219     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    
227    
228 greg 2.13 int
229 schorsch 2.12 o_ring( /* make an illum ring */
230     OBJREC *ob,
231     struct illum_args *il,
232     struct rtproc *rt,
233     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     register CONE *co;
243     register int i, j;
244     /* get/check arguments */
245     co = getcone(ob, 0);
246     /* set up sampling */
247 greg 1.11 if (il->sampdens <= 0)
248     nalt = nazi = 1;
249     else {
250     n = PI * il->sampdens;
251     nalt = sqrt(n/PI) + .5;
252     nazi = PI*nalt + .5;
253     }
254 greg 1.3 n = nalt*nazi;
255     distarr = (float *)calloc(n, 3*sizeof(float));
256     if (distarr == NULL)
257     error(SYSTEM, "out of memory in o_ring");
258     mkaxes(u, v, co->ad);
259     dim[0] = random();
260     /* sample disk */
261     for (dim[1] = 0; dim[1] < nalt; dim[1]++)
262     for (dim[2] = 0; dim[2] < nazi; dim[2]++)
263     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     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    
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 }