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root/Development/ray/src/cv/tmesh2rad.c

Comparing ray/src/cv/tmesh2rad.c (file contents):
Revision 2.7 by greg, Wed Jun 15 19:06:02 1994 UTC vs.
Revision 2.13 by schorsch, Thu Jun 26 00:58:09 2003 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1994 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		* Convert a trianglular mesh into a Radiance description.
6		*
#	Line 34 | Line 31 | static char SCCSid[] = "$SunId$ LBL";
31
32		#include "standard.h"
33
34	<	#define  ABS(x)         ((x)>=0 ? (x) : -(x))
34	>	#include "tmesh.h"
35
36		#define VOIDID          "void"          /* this is defined in object.h */
37
41	–	#define CALNAME         "tmesh.cal"     /* the name of our auxiliary file */
38		#define PATNAME         "T-pat"         /* triangle pattern name (reused) */
39		#define TEXNAME         "T-nor"         /* triangle texture name (reused) */
40
#	Line 56 | Line 52 | typedef struct {
52		VERTEX  *vlist = NULL;          /* our vertex list */
53		int     nverts = 0;             /* number of vertices in our list */
54
59	–	typedef struct {
60	–	int     ax;             /* major axis */
61	–	FLOAT   tm[2][3];       /* transformation */
62	–	} BARYCCM;
63	–
55		#define novert(i)       ((i)<0|(i)>=nverts || !(vlist[i].flags&V_DEFINED))
56
57		#define CHUNKSIZ        128     /* vertex allocation chunk size */
#	Line 208 | Line 199 | triangle(pn, mod, obj, v1, v2, v3)     /* put out a triang
199		char    *pn, *mod, *obj;
200		register VERTEX *v1, *v2, *v3;
201		{
202	+	static char     vfmt[] = "%18.12g %18.12g %18.12g\n";
203		static int      ntri = 0;
204	+	int             flatness = ISFLAT;
205		BARYCCM bvecs;
206	<	FLOAT   bvm[3][3];
206	>	RREAL   bvm[3][3];
207		register int    i;
208		/* compute barycentric coordinates */
209		if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM))
210		if (comp_baryc(&bvecs, v1->pos, v2->pos, v3->pos) < 0)
211		return;
212	<	/* put out texture (if any) */
212	>	/* check flatness */
213		if (v1->flags & v2->flags & v3->flags & V_HASNORM) {
214	+	flatness = flat_tri(v1->pos, v2->pos, v3->pos,
215	+	v1->nor, v2->nor, v3->nor);
216	+	if (flatness == DEGEN)
217	+	return;
218	+	}
219	+	/* put out texture (if any) */
220	+	if (flatness == ISBENT || flatness == RVBENT) {
221		printf("\n%s texfunc %s\n", mod, TEXNAME);
222		mod = TEXNAME;
223	<	printf("4 dx dy dz %s\n", CALNAME);
223	>	printf("4 dx dy dz %s\n", TCALNAME);
224		printf("0\n");
225		for (i = 0; i < 3; i++) {
226		bvm[i][0] = v1->nor[i];
#	Line 233 | Line 233 | register VERTEX        *v1, *v2, *v3;
233		if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) {
234		printf("\n%s colorpict %s\n", mod, PATNAME);
235		mod = PATNAME;
236	<	printf("7 noneg noneg noneg %s %s u v\n", pn, CALNAME);
236	>	printf("7 noneg noneg noneg %s %s u v\n", pn, TCALNAME);
237		printf("0\n");
238		for (i = 0; i < 2; i++) {
239		bvm[i][0] = v1->ndx[i];
#	Line 242 | Line 242 | register VERTEX        *v1, *v2, *v3;
242		}
243		put_baryc(&bvecs, bvm, 2);
244		}
245	<	/* put out triangle */
245	>	/* put out (reversed) triangle */
246		printf("\n%s polygon %s.%d\n", mod, obj, ++ntri);
247		printf("0\n0\n9\n");
248	<	printf("%18.12g %18.12g %18.12g\n", v1->pos[0],v1->pos[1],v1->pos[2]);
249	<	printf("%18.12g %18.12g %18.12g\n", v2->pos[0],v2->pos[1],v2->pos[2]);
250	<	printf("%18.12g %18.12g %18.12g\n", v3->pos[0],v3->pos[1],v3->pos[2]);
251	<	}
252	<
253	<
254	<	int
255	<	comp_baryc(bcm, v1, v2, v3)             /* compute barycentric vectors */
256	<	register BARYCCM        *bcm;
257	<	FLOAT   *v1, *v2, *v3;
258	<	{
259	<	FLOAT   *vt;
260	<	FVECT   va, vab, vcb;
261	<	double  d;
262	<	int     ax0, ax1;
263	<	register int    i, j;
264	<	/* compute major axis */
265	<	for (i = 0; i < 3; i++) {
266	<	vab[i] = v1[i] - v2[i];
267	<	vcb[i] = v3[i] - v2[i];
248	>	if (flatness == RVFLAT || flatness == RVBENT) {
249	>	printf(vfmt, v3->pos[0],v3->pos[1],v3->pos[2]);
250	>	printf(vfmt, v2->pos[0],v2->pos[1],v2->pos[2]);
251	>	printf(vfmt, v1->pos[0],v1->pos[1],v1->pos[2]);
252	>	} else {
253	>	printf(vfmt, v1->pos[0],v1->pos[1],v1->pos[2]);
254	>	printf(vfmt, v2->pos[0],v2->pos[1],v2->pos[2]);
255	>	printf(vfmt, v3->pos[0],v3->pos[1],v3->pos[2]);
256		}
269	–	fcross(va, vab, vcb);
270	–	bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1;
271	–	bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2;
272	–	ax0 = (bcm->ax + 1) % 3;
273	–	ax1 = (bcm->ax + 2) % 3;
274	–	for (j = 0; j < 2; j++) {
275	–	vab[0] = v1[ax0] - v2[ax0];
276	–	vcb[0] = v3[ax0] - v2[ax0];
277	–	vab[1] = v1[ax1] - v2[ax1];
278	–	vcb[1] = v3[ax1] - v2[ax1];
279	–	d = vcb[0]*vcb[0] + vcb[1]*vcb[1];
280	–	if (d <= FTINY)
281	–	return(-1);
282	–	d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d;
283	–	va[0] = vab[0] - vcb[0]*d;
284	–	va[1] = vab[1] - vcb[1]*d;
285	–	d = va[0]*va[0] + va[1]*va[1];
286	–	if (d <= FTINY)
287	–	return(-1);
288	–	bcm->tm[j][0] = va[0] /= d;
289	–	bcm->tm[j][1] = va[1] /= d;
290	–	bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]);
291	–	/* rotate vertices */
292	–	vt = v1;
293	–	v1 = v2;
294	–	v2 = v3;
295	–	v3 = vt;
296	–	}
297	–	return(0);
257		}
258
259
301	–	put_baryc(bcm, com, n)                  /* put barycentric coord. vectors */
302	–	register BARYCCM        *bcm;
303	–	register FLOAT  com[][3];
304	–	int     n;
305	–	{
306	–	double  a, b;
307	–	register int    i, j;
308	–
309	–	printf("%d\t%d\n", 1+3*n, bcm->ax);
310	–	for (i = 0; i < n; i++) {
311	–	a = com[i][0] - com[i][2];
312	–	b = com[i][1] - com[i][2];
313	–	printf("%14.8f %14.8f %14.8f\n",
314	–	bcm->tm[0][0]*a + bcm->tm[1][0]*b,
315	–	bcm->tm[0][1]*a + bcm->tm[1][1]*b,
316	–	bcm->tm[0][2]*a + bcm->tm[1][2]*b + com[i][2]);
317	–	}
318	–	}
319	–
320	–
260		VERTEX *
261		vnew(id, x, y, z)                       /* create a new vertex */
262		register int    id;
#	Line 331 | Line 270 | double x, y, z;
270		if (vlist == NULL)
271		vlist = (VERTEX *)malloc(nverts*sizeof(VERTEX));
272		else
273	<	vlist = (VERTEX *)realloc((char *)vlist,
273	>	vlist = (VERTEX *)realloc((void *)vlist,
274		nverts*sizeof(VERTEX));
275		if (vlist == NULL) {
276		fprintf(stderr,

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