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

Comparing ray/src/rt/normal.c (file contents):
Revision 2.4 by greg, Tue Jan 14 15:33:08 1992 UTC vs.
Revision 2.7 by greg, Wed Jan 15 11:41:44 1992 UTC

#	Line 20 | Line 20 | static char SCCSid[] = "$SunId$ LBL";
20
21		#include  "random.h"
22
23	+	extern double  specthresh;              /* specular sampling threshold */
24	+	extern double  specjitter;              /* specular sampling jitter */
25	+
26		/*
27		*      This routine uses portions of the reflection
28		*  model described by Cook and Torrance.
#	Line 42 | Line 45 | static char SCCSid[] = "$SunId$ LBL";
45		#define  SP_TRAN        02              /* has transmitted specular */
46		#define  SP_PURE        010             /* purely specular (zero roughness) */
47		#define  SP_FLAT        020             /* flat reflecting surface */
48	+	#define  SP_RBLT        040             /* reflection below sample threshold */
49	+	#define  SP_TBLT        0100            /* transmission below threshold */
50
51		typedef struct {
52		OBJREC  *mp;            /* material pointer */
#	Line 186 | Line 191 | register RAY  *r;
191		for (i = 0; i < 3; i++)
192		colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp;
193		nd.rspec += (1.0-nd.rspec)*dtmp;
194	+	/* check threshold */
195	+	if (specthresh > FTINY &&
196	+	((specthresh >= 1.-FTINY ||
197	+	specthresh + (.1 - .2*urand(8199+samplendx))
198	+	> nd.rspec)))
199	+	nd.specfl |= SP_RBLT;
200		/* compute reflected ray */
201		for (i = 0; i < 3; i++)
202		nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i];
203	+	if (DOT(nd.vrefl, r->ron) <= FTINY)     /* penetration? */
204	+	for (i = 0; i < 3; i++)         /* safety measure */
205	+	nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i];
206
207		if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) {
208		RAY  lr;
#	Line 207 | Line 221 | register RAY  *r;
221		nd.tdiff = nd.trans - nd.tspec;
222		if (nd.tspec > FTINY) {
223		nd.specfl |= SP_TRAN;
224	+	/* check threshold */
225	+	if (specthresh > FTINY &&
226	+	((specthresh >= 1.-FTINY ||
227	+	specthresh +
228	+	(.1 - .2*urand(7241+samplendx))
229	+	> nd.tspec)))
230	+	nd.specfl |= SP_TBLT;
231		if (r->crtype & SHADOW ||
232		DOT(r->pert,r->pert) <= FTINY*FTINY) {
233		VCOPY(nd.prdir, r->rdir);
#	Line 215 | Line 236 | register RAY  *r;
236		for (i = 0; i < 3; i++)         /* perturb */
237		nd.prdir[i] = r->rdir[i] -
238		.75*r->pert[i];
239	<	normalize(nd.prdir);
239	>	if (DOT(nd.prdir, r->ron) < -FTINY)
240	>	normalize(nd.prdir);    /* OK */
241	>	else
242	>	VCOPY(nd.prdir, r->rdir);
243		}
244		}
245		} else
#	Line 250 | Line 274 | register RAY  *r;
274
275		if (nd.rdiff > FTINY) {         /* ambient from this side */
276		ambient(ctmp, r);
277	<	scalecolor(ctmp, nd.rdiff);
277	>	if (nd.specfl & SP_RBLT)
278	>	scalecolor(ctmp, 1.0-nd.trans);
279	>	else
280	>	scalecolor(ctmp, nd.rdiff);
281		multcolor(ctmp, nd.mcolor);     /* modified by material color */
282		addcolor(r->rcol, ctmp);        /* add to returned color */
283		}
284		if (nd.tdiff > FTINY) {         /* ambient from other side */
285		flipsurface(r);
286		ambient(ctmp, r);
287	<	scalecolor(ctmp, nd.tdiff);
287	>	if (nd.specfl & SP_TBLT)
288	>	scalecolor(ctmp, nd.trans);
289	>	else
290	>	scalecolor(ctmp, nd.tdiff);
291		multcolor(ctmp, nd.mcolor);     /* modified by color */
292		addcolor(r->rcol, ctmp);
293		flipsurface(r);
#	Line 279 | Line 309 | register NORMDAT  *np;
309		FVECT  u, v, h;
310		double  rv[2];
311		double  d, sinp, cosp;
282	–	int  ntries;
312		register int  i;
313		/* set up sample coordinates */
314		v[0] = v[1] = v[2] = 0.0;
#	Line 291 | Line 320 | register NORMDAT  *np;
320		normalize(u);
321		fcross(v, np->pnorm, u);
322		/* compute reflection */
323	<	if (np->specfl & SP_REFL &&
323	>	if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL &&
324		rayorigin(&sr, r, SPECULAR, np->rspec) == 0) {
325		dimlist[ndims++] = (int)np->mp;
326	<	for (ntries = 0; ntries < 10; ntries++) {
327	<	dimlist[ndims] = ntries * 8912;
328	<	d = urand(ilhash(dimlist,ndims+1)+samplendx);
329	<	multisamp(rv, 2, d);
330	<	d = 2.0*PI * rv[0];
331	<	cosp = cos(d);
332	<	sinp = sin(d);
333	<	if (rv[1] <= FTINY)
334	<	d = 1.0;
335	<	else
336	<	d = sqrt( np->alpha2 * -log(rv[1]) );
337	<	for (i = 0; i < 3; i++)
338	<	h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]);
339	<	d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d);
340	<	for (i = 0; i < 3; i++)
341	<	sr.rdir[i] = r->rdir[i] + d*h[i];
342	<	if (DOT(sr.rdir, r->ron) > FTINY) {
343	<	rayvalue(&sr);
344	<	multcolor(sr.rcol, np->scolor);
345	<	addcolor(r->rcol, sr.rcol);
317	<	break;
318	<	}
319	<	}
326	>	d = urand(ilhash(dimlist,ndims)+samplendx);
327	>	multisamp(rv, 2, d);
328	>	d = 2.0*PI * rv[0];
329	>	cosp = cos(d);
330	>	sinp = sin(d);
331	>	rv[1] = 1.0 - specjitter*rv[1];
332	>	if (rv[1] <= FTINY)
333	>	d = 1.0;
334	>	else
335	>	d = sqrt( np->alpha2 * -log(rv[1]) );
336	>	for (i = 0; i < 3; i++)
337	>	h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]);
338	>	d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d);
339	>	for (i = 0; i < 3; i++)
340	>	sr.rdir[i] = r->rdir[i] + d*h[i];
341	>	if (DOT(sr.rdir, r->ron) <= FTINY)
342	>	VCOPY(sr.rdir, np->vrefl);      /* jitter no good */
343	>	rayvalue(&sr);
344	>	multcolor(sr.rcol, np->scolor);
345	>	addcolor(r->rcol, sr.rcol);
346		ndims--;
347		}
348		/* compute transmission */

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