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root/Development/ray/src/gen/mkillum2.c

Comparing ray/src/gen/mkillum2.c (file contents):
Revision 1.2 by greg, Wed Jul 24 12:22:05 1991 UTC vs.
Revision 1.3 by greg, Wed Jul 24 13:32:05 1991 UTC

#	Line 64 | Line 64 | struct illum_args  *il;
64		struct rtproc  *rt;
65		char  *nm;
66		{
67	+	#define MAXMISS         (5*n*il->nsamps)
68	+	int  dim[4];
69	+	int  n, nalt, nazi;
70	+	float  *distarr;
71	+	double  r1, r2;
72	+	FVECT  dn, pos, dir;
73	+	FVECT  u, v;
74	+	double  ur[2], vr[2];
75	+	int  nmisses;
76	+	register FACE  *fa;
77	+	register int  i, j;
78	+	/* get/check arguments */
79	+	fa = getface(ob);
80	+	if (fa->area == 0.0) {
81	+	freeface(ob);
82	+	o_default(ob, il, rt, nm);
83	+	return;
84	+	}
85	+	/* set up sampling */
86	+	n = PI * il->sampdens;
87	+	nalt = sqrt(n/PI) + .5;
88	+	nazi = PI*nalt + .5;
89	+	n = nalt*nazi;
90	+	distarr = (float *)calloc(n, 3*sizeof(float));
91	+	if (distarr == NULL)
92	+	error(SYSTEM, "out of memory in o_face");
93	+	mkaxes(u, v, fa->norm);
94	+	ur[0] = vr[0] = FHUGE;
95	+	ur[1] = vr[1] = -FHUGE;
96	+	for (i = 0; i < fa->nv; i++) {
97	+	r1 = DOT(VERTEX(fa,i),u);
98	+	if (r1 < ur[0]) ur[0] = r1;
99	+	if (r1 > ur[1]) ur[1] = r1;
100	+	r2 = DOT(VERTEX(fa,i),v);
101	+	if (r2 < vr[0]) vr[0] = r2;
102	+	if (r2 > vr[1]) vr[1] = r2;
103	+	}
104	+	dim[0] = random();
105	+	/* sample polygon */
106	+	nmisses = 0;
107	+	for (dim[1] = 0; dim[1] < nalt; dim[1]++)
108	+	for (dim[2] = 0; dim[2] < nazi; dim[2]++)
109	+	for (i = 0; i < il->nsamps; i++) {
110	+	/* random direction */
111	+	dim[3] = 1;
112	+	r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
113	+	dim[3] = 2;
114	+	r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
115	+	flatdir(dn, r1, r2);
116	+	for (j = 0; j < 3; j++)
117	+	dir[j] = dn[0]*u[j] + dn[1]*v[j] - dn[2]*fa->norm[j];
118	+	/* random location */
119	+	do {
120	+	dim[3] = 3;
121	+	r1 = ur[0] +
122	+	(ur[1]-ur[0])*urand(urind(ilhash(dim,4),i));
123	+	dim[3] = 4;
124	+	r2 = vr[0] +
125	+	(vr[1]-vr[0])*urand(urind(ilhash(dim,4),i));
126	+	for (j = 0; j < 3; j++)
127	+	org[j] = r1*u[j] + r2*v[j]
128	+	+ fa->offset*fa->norm[j];
129	+	} while (!inface(org, fa) && nmisses++ < MAXMISS);
130	+	if (nmisses > MAXMISS) {
131	+	objerror(ob, WARNING, "bad aspect");
132	+	rt->nrays = 0;
133	+	freeface(ob);
134	+	free((char *)distarr);
135	+	o_default(ob, il, rt, nm);
136	+	return;
137	+	}
138	+	for (j = 0; j < 3; j++)
139	+	org[j] += .001*fa->norm[j];
140	+	/* send sample */
141	+	raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
142	+	}
143	+	rayflush(rt);
144	+	/* write out the distribution */
145	+	flatdist(distarr, nalt, nazi, il, ob);
146	+	/* clean up */
147	+	freeface(ob);
148	+	free((char *)distarr);
149	+	#undef MAXMISS
150		}
151
152
153		o_sphere(ob, il, rt, nm)        /* make an illum sphere */
154	<	OBJREC  *ob;
154	>	register OBJREC  *ob;
155		struct illum_args  *il;
156		struct rtproc  *rt;
157		char  *nm;
#	Line 117 | Line 200 | char  *nm;
200		raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
201		}
202		rayflush(rt);
203	<	/* write out distribution */
203	>	/* write out the distribution */
204		rounddist(distarr, nalt, nazi, il, ob);
205		/* clean up */
206		free((char *)distarr);
#	Line 130 | Line 213 | struct illum_args  *il;
213		struct rtproc  *rt;
214		char  *nm;
215		{
216	+	int  dim[4];
217	+	int  n, nalt, nazi;
218	+	float  *distarr;
219	+	double  r1, r2;
220	+	FVECT  dn, pos, dir;
221	+	FVECT  u, v;
222	+	register CONE  *co;
223	+	register int  i, j;
224	+	/* get/check arguments */
225	+	co = getcone(ob, 0);
226	+	/* set up sampling */
227	+	n = PI * il->sampdens;
228	+	nalt = sqrt(n/PI) + .5;
229	+	nazi = PI*nalt + .5;
230	+	n = nalt*nazi;
231	+	distarr = (float *)calloc(n, 3*sizeof(float));
232	+	if (distarr == NULL)
233	+	error(SYSTEM, "out of memory in o_ring");
234	+	mkaxes(u, v, co->ad);
235	+	dim[0] = random();
236	+	/* sample disk */
237	+	for (dim[1] = 0; dim[1] < nalt; dim[1]++)
238	+	for (dim[2] = 0; dim[2] < nazi; dim[2]++)
239	+	for (i = 0; i < il->nsamps; i++) {
240	+	/* random direction */
241	+	dim[3] = 1;
242	+	r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
243	+	dim[3] = 2;
244	+	r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
245	+	flatdir(dn, r1, r2);
246	+	for (j = 0; j < 3; j++)
247	+	dir[j] = dn[0]*u[j] + dn[1]*v[j] - dn[2]*co->ad[j];
248	+	/* random location */
249	+	dim[3] = 3;
250	+	r1 = sqrt(CO_R0(co)*CO_R0(co) +
251	+	urand(urind(ilhash(dim,4),i))*
252	+	(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co)));
253	+	dim[3] = 4;
254	+	r2 = 2.*PI*urand(urind(ilhash(dim,4),i));
255	+	for (j = 0; j < 3; j++)
256	+	org[j] = CO_P0(co)[j] +
257	+	r1*cos(r2)*u[j] + r1*sin(r2)*v[j]
258	+	+ .001*co->ad[j];
259	+
260	+	/* send sample */
261	+	raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
262	+	}
263	+	rayflush(rt);
264	+	/* write out the distribution */
265	+	flatdist(distarr, nalt, nazi, il, ob);
266	+	/* clean up */
267	+	freecone(ob);
268	+	free((char *)distarr);
269		}
270
271

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