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root/Development/ray/src/rt/aniso.c

Comparing ray/src/rt/aniso.c (file contents):
Revision 2.3 by greg, Mon Jan 6 18:01:41 1992 UTC vs.
Revision 2.6 by greg, Wed Jan 15 11:41:47 1992 UTC

#	Line 16 | Line 16 | static char SCCSid[] = "$SunId$ LBL";
16
17		#include  "random.h"
18
19	+	extern double  specthresh;              /* specular sampling threshold */
20	+	extern double  specjitter;              /* specular sampling jitter */
21	+
22		/*
23		*      This anisotropic reflection model uses a variant on the
24		*  exponential Gaussian used in normal.c.
#	Line 37 | Line 40 | static char SCCSid[] = "$SunId$ LBL";
40		#define  SP_REFL        01              /* has reflected specular component */
41		#define  SP_TRAN        02              /* has transmitted specular */
42		#define  SP_PURE        010             /* purely specular (zero roughness) */
43	<	#define  SP_BADU        020             /* bad u direction calculation */
44	<	#define  SP_FLAT        040             /* reflecting surface is flat */
43	>	#define  SP_FLAT        020             /* reflecting surface is flat */
44	>	#define  SP_RBLT        040             /* reflection below sample threshold */
45	>	#define  SP_TBLT        0100            /* transmission below threshold */
46	>	#define  SP_BADU        0200            /* bad u direction calculation */
47
48		typedef struct {
49		OBJREC  *mp;            /* material pointer */
#	Line 46 | Line 51 | typedef struct {
51		short  specfl;          /* specularity flags, defined above */
52		COLOR  mcolor;          /* color of this material */
53		COLOR  scolor;          /* color of specular component */
54	+	FVECT  vrefl;           /* vector in reflected direction */
55		FVECT  prdir;           /* vector in transmitted direction */
56		FVECT  u, v;            /* u and v vectors orienting anisotropy */
57		double  u_alpha;        /* u roughness */
#	Line 200 | Line 206 | register RAY  *r;
206		for (i = 0; i < 3; i++)
207		colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp;
208		nd.rspec += (1.0-nd.rspec)*dtmp;
209	+	/* check threshold */
210	+	if (specthresh > FTINY &&
211	+	((specthresh >= 1.-FTINY ||
212	+	specthresh + (.1 - .2*urand(8199+samplendx))
213	+	> nd.rspec)))
214	+	nd.specfl |= SP_RBLT;
215	+	/* compute refl. direction */
216	+	for (i = 0; i < 3; i++)
217	+	nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i];
218	+	if (DOT(nd.vrefl, r->ron) <= FTINY)     /* penetration? */
219	+	for (i = 0; i < 3; i++)         /* safety measure */
220	+	nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i];
221
222		if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) {
223		RAY  lr;
224		if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) {
225	<	for (i = 0; i < 3; i++)
208	<	lr.rdir[i] = r->rdir[i] +
209	<	2.0*nd.pdot*nd.pnorm[i];
225	>	VCOPY(lr.rdir, nd.vrefl);
226		rayvalue(&lr);
227		multcolor(lr.rcol, nd.scolor);
228		addcolor(r->rcol, lr.rcol);
#	Line 220 | Line 236 | register RAY  *r;
236		nd.tdiff = nd.trans - nd.tspec;
237		if (nd.tspec > FTINY) {
238		nd.specfl |= SP_TRAN;
239	+	/* check threshold */
240	+	if (specthresh > FTINY &&
241	+	((specthresh >= 1.-FTINY ||
242	+	specthresh +
243	+	(.1 - .2*urand(7241+samplendx))
244	+	> nd.tspec)))
245	+	nd.specfl |= SP_TBLT;
246		if (r->crtype & SHADOW ||
247		DOT(r->pert,r->pert) <= FTINY*FTINY) {
248		VCOPY(nd.prdir, r->rdir);
#	Line 228 | Line 251 | register RAY  *r;
251		for (i = 0; i < 3; i++)         /* perturb */
252		nd.prdir[i] = r->rdir[i] -
253		.75*r->pert[i];
254	<	normalize(nd.prdir);
254	>	if (DOT(nd.prdir, r->ron) < -FTINY)
255	>	normalize(nd.prdir);    /* OK */
256	>	else
257	>	VCOPY(nd.prdir, r->rdir);
258		}
259		}
260		} else
#	Line 255 | Line 281 | register RAY  *r;
281		if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY)
282		return;                         /* 100% pure specular */
283
284	+	if (r->ro->otype == OBJ_FACE || r->ro->otype == OBJ_RING)
285	+	nd.specfl |= SP_FLAT;
286	+
287		getacoords(r, &nd);                     /* set up coordinates */
288
289		if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & (SP_PURE|SP_BADU)))
#	Line 262 | Line 291 | register RAY  *r;
291
292		if (nd.rdiff > FTINY) {         /* ambient from this side */
293		ambient(ctmp, r);
294	<	scalecolor(ctmp, nd.rdiff);
294	>	if (nd.specfl & SP_RBLT)
295	>	scalecolor(ctmp, 1.0-nd.trans);
296	>	else
297	>	scalecolor(ctmp, nd.rdiff);
298		multcolor(ctmp, nd.mcolor);     /* modified by material color */
299		addcolor(r->rcol, ctmp);        /* add to returned color */
300		}
301		if (nd.tdiff > FTINY) {         /* ambient from other side */
302		flipsurface(r);
303		ambient(ctmp, r);
304	<	scalecolor(ctmp, nd.tdiff);
304	>	if (nd.specfl & SP_TBLT)
305	>	scalecolor(ctmp, nd.trans);
306	>	else
307	>	scalecolor(ctmp, nd.tdiff);
308		multcolor(ctmp, nd.mcolor);     /* modified by color */
309		addcolor(r->rcol, ctmp);
310		flipsurface(r);
#	Line 320 | Line 355 | register ANISODAT  *np;
355		FVECT  h;
356		double  rv[2];
357		double  d, sinp, cosp;
323	–	int  ntries;
358		register int  i;
359		/* compute reflection */
360	<	if (np->specfl & SP_REFL &&
360	>	if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL &&
361		rayorigin(&sr, r, SPECULAR, np->rspec) == 0) {
362		dimlist[ndims++] = (int)np->mp;
363	<	for (ntries = 0; ntries < 10; ntries++) {
364	<	dimlist[ndims] = ntries * 3601;
365	<	d = urand(ilhash(dimlist,ndims+1)+samplendx);
366	<	multisamp(rv, 2, d);
367	<	d = 2.0*PI * rv[0];
368	<	cosp = np->u_alpha * cos(d);
369	<	sinp = np->v_alpha * sin(d);
370	<	d = sqrt(cosp*cosp + sinp*sinp);
371	<	cosp /= d;
372	<	sinp /= d;
373	<	if (rv[1] <= FTINY)
374	<	d = 1.0;
375	<	else
376	<	d = sqrt(-log(rv[1]) /
377	<	(cosp*cosp/(np->u_alpha*np->u_alpha) +
378	<	sinp*sinp/(np->v_alpha*np->v_alpha)));
379	<	for (i = 0; i < 3; i++)
380	<	h[i] = np->pnorm[i] +
381	<	d*(cosp*np->u[i] + sinp*np->v[i]);
382	<	d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d);
383	<	for (i = 0; i < 3; i++)
384	<	sr.rdir[i] = r->rdir[i] + d*h[i];
385	<	if (DOT(sr.rdir, r->ron) > FTINY) {
386	<	rayvalue(&sr);
387	<	multcolor(sr.rcol, np->scolor);
388	<	addcolor(r->rcol, sr.rcol);
355	<	break;
356	<	}
357	<	}
363	>	d = urand(ilhash(dimlist,ndims)+samplendx);
364	>	multisamp(rv, 2, d);
365	>	d = 2.0*PI * rv[0];
366	>	cosp = np->u_alpha * cos(d);
367	>	sinp = np->v_alpha * sin(d);
368	>	d = sqrt(cosp*cosp + sinp*sinp);
369	>	cosp /= d;
370	>	sinp /= d;
371	>	rv[1] = 1.0 - specjitter*rv[1];
372	>	if (rv[1] <= FTINY)
373	>	d = 1.0;
374	>	else
375	>	d = sqrt(-log(rv[1]) /
376	>	(cosp*cosp/(np->u_alpha*np->u_alpha) +
377	>	sinp*sinp/(np->v_alpha*np->v_alpha)));
378	>	for (i = 0; i < 3; i++)
379	>	h[i] = np->pnorm[i] +
380	>	d*(cosp*np->u[i] + sinp*np->v[i]);
381	>	d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d);
382	>	for (i = 0; i < 3; i++)
383	>	sr.rdir[i] = r->rdir[i] + d*h[i];
384	>	if (DOT(sr.rdir, r->ron) <= FTINY)      /* penetration? */
385	>	VCOPY(sr.rdir, np->vrefl);      /* jitter no good */
386	>	rayvalue(&sr);
387	>	multcolor(sr.rcol, np->scolor);
388	>	addcolor(r->rcol, sr.rcol);
389		ndims--;
390		}
391		/* compute transmission */

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