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Comparing ray/src/rt/m_direct.c (file contents):
Revision 1.3 by greg, Tue Jul 16 17:16:32 1991 UTC vs.
Revision 2.9 by greg, Tue Feb 25 02:47:22 2003 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1991 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		* Routines for light-redirecting materials and
6		*   their associated virtual light sources
7		*/
8
9	+	#include "copyright.h"
10	+
11		#include  "ray.h"
12
13		#include  "otypes.h"
14
15		#include  "source.h"
16
17	+	#include  "func.h"
18	+
19		/*
20		* The arguments for MAT_DIRECT1 are:
21		*
#	Line 30 | Line 31 | static char SCCSid[] = "$SunId$ LBL";
31		*/
32
33
34	<	extern double  varvalue();
34	>	static int  dir_proj();
35
35	–	int  dir_proj();
36		VSMATERIAL  direct1_vs = {dir_proj, 1};
37		VSMATERIAL  direct2_vs = {dir_proj, 2};
38
39	+	#define getdfunc(m)     ( (m)->otype == MAT_DIRECT1 ? \
40	+	getfunc(m, 4, 0xf, 1) : \
41	+	getfunc(m, 8, 0xff, 1) )
42
43	+
44	+	int
45		m_direct(m, r)                  /* shade redirected ray */
46		register OBJREC  *m;
47		register RAY  *r;
48		{
49		/* check if source ray */
50		if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
51	<	return;                         /* got the wrong guy */
47	<	dir_check(m);
51	>	return(1);                      /* got the wrong guy */
52		/* compute first projection */
53		if (m->otype == MAT_DIRECT1 ||
54		(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0))
#	Line 53 | Line 57 | register RAY  *r;
57		if (m->otype == MAT_DIRECT2 &&
58		(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1))
59		redirect(m, r, 1);
60	+	return(1);
61		}
62
63
64	+	int
65		redirect(m, r, n)               /* compute n'th ray redirection */
66		OBJREC  *m;
67		RAY  *r;
68		int  n;
69		{
70	<	register char  **sa;
70	>	MFUNC  *mf;
71	>	register EPNODE  **va;
72	>	FVECT  nsdir;
73		RAY  nr;
74		double  coef;
75		register int  j;
76		/* set up function */
77	+	mf = getdfunc(m);
78		setfunc(m, r);
79	<	sa = m->oargs.sarg + 4*n;
79	>	/* assign direction variable */
80	>	if (r->rsrc >= 0) {
81	>	register SRCREC  *sp = source + source[r->rsrc].sa.sv.sn;
82	>
83	>	if (sp->sflags & SDISTANT)
84	>	VCOPY(nsdir, sp->sloc);
85	>	else {
86	>	for (j = 0; j < 3; j++)
87	>	nsdir[j] = sp->sloc[j] - r->rop[j];
88	>	normalize(nsdir);
89	>	}
90	>	multv3(nsdir, nsdir, funcxf.xfm);
91	>	varset("DxA", '=', nsdir[0]/funcxf.sca);
92	>	varset("DyA", '=', nsdir[1]/funcxf.sca);
93	>	varset("DzA", '=', nsdir[2]/funcxf.sca);
94	>	} else {
95	>	varset("DxA", '=', 0.0);
96	>	varset("DyA", '=', 0.0);
97	>	varset("DzA", '=', 0.0);
98	>	}
99		/* compute coefficient */
100		errno = 0;
101	<	coef = varvalue(sa[0]);
101	>	va = mf->ep + 4*n;
102	>	coef = evalue(va[0]);
103		if (errno)
104		goto computerr;
105		if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0)
106		return(0);
107	<	/* compute direction */
108	<	errno = 0;
109	<	for (j = 0; j < 3; j++)
110	<	nr.rdir[j] = varvalue(sa[j+1]);
111	<	if (errno || normalize(nr.rdir) == 0.0)
107	>	va++;                           /* compute direction */
108	>	for (j = 0; j < 3; j++) {
109	>	nr.rdir[j] = evalue(va[j]);
110	>	if (errno)
111	>	goto computerr;
112	>	}
113	>	if (mf->f != &unitxf)
114	>	multv3(nr.rdir, nr.rdir, mf->f->xfm);
115	>	if (r->rox != NULL)
116	>	multv3(nr.rdir, nr.rdir, r->rox->f.xfm);
117	>	if (normalize(nr.rdir) == 0.0)
118		goto computerr;
119		/* compute value */
120		if (r->rsrc >= 0)
#	Line 87 | Line 122 | int  n;
122		rayvalue(&nr);
123		scalecolor(nr.rcol, coef);
124		addcolor(r->rcol, nr.rcol);
125	+	if (r->ro != NULL && isflat(r->ro->otype))
126	+	r->rt = r->rot + nr.rt;
127		return(1);
128		computerr:
129		objerror(m, WARNING, "compute error");
#	Line 94 | Line 131 | computerr:
131		}
132
133
134	+	static int
135		dir_proj(pm, o, s, n)           /* compute a director's projection */
136		MAT4  pm;
137		OBJREC  *o;
#	Line 101 | Line 139 | SRCREC  *s;
139		int  n;
140		{
141		RAY  tr;
142	<	register OBJREC  *m;
143	<	char  **sa;
142	>	OBJREC  *m;
143	>	MFUNC  *mf;
144	>	EPNODE  **va;
145		FVECT  cent, newdir, nv, h;
146	<	double  olddot, newdot, od;
146	>	double  coef, olddot, newdot, od;
147		register int  i, j;
109	–	/* get material arguments */
110	–	m = objptr(o->omod);
111	–	dir_check(m);
112	–	sa = m->oargs.sarg + 4*n;
148		/* initialize test ray */
149		getmaxdisk(cent, o);
150		if (s->sflags & SDISTANT)
#	Line 129 | Line 164 | int  n;
164		olddot = DOT(tr.rdir, nv);
165		if (olddot <= FTINY && olddot >= -FTINY)
166		return(0);              /* old dir parallels plane */
167	+	tr.rmax = 0.0;
168		rayorigin(&tr, NULL, PRIMARY, 1.0);
169		if (!(*ofun[o->otype].funp)(o, &tr))
170		return(0);              /* no intersection! */
171		/* compute redirection */
172	+	m = vsmaterial(o);
173	+	mf = getdfunc(m);
174		setfunc(m, &tr);
175	+	varset("DxA", '=', 0.0);
176	+	varset("DyA", '=', 0.0);
177	+	varset("DzA", '=', 0.0);
178		errno = 0;
179	<	if (varvalue(sa[0]) <= FTINY)
180	<	return(0);              /* insignificant */
179	>	va = mf->ep + 4*n;
180	>	coef = evalue(va[0]);
181		if (errno)
182		goto computerr;
183	<	for (i = 0; i < 3; i++)
184	<	newdir[i] = varvalue(sa[i+1]);
185	<	if (errno)
186	<	goto computerr;
183	>	if (coef <= FTINY)
184	>	return(0);              /* insignificant */
185	>	va++;
186	>	for (i = 0; i < 3; i++) {
187	>	newdir[i] = evalue(va[i]);
188	>	if (errno)
189	>	goto computerr;
190	>	}
191	>	if (mf->f != &unitxf)
192	>	multv3(newdir, newdir, mf->f->xfm);
193	>	/* normalization unnecessary */
194		newdot = DOT(newdir, nv);
195		if (newdot <= FTINY && newdot >= -FTINY)
196		return(0);              /* new dir parallels plane */
197		/* everything OK -- compute shear */
198		for (i = 0; i < 3; i++)
199	<	h[i] = tr.rdir[i]/olddot + newdir[i]/newdot;
199	>	h[i] = newdir[i]/newdot - tr.rdir[i]/olddot;
200		setident4(pm);
201		for (j = 0; j < 3; j++) {
202		for (i = 0; i < 3; i++)
#	Line 165 | Line 213 | int  n;
213		computerr:
214		objerror(m, WARNING, "projection compute error");
215		return(0);
168	–	}
169	–
170	–
171	–	static
172	–	dir_check(m)                    /* check arguments and load function file */
173	–	register OBJREC  *m;
174	–	{
175	–	register int  ff;
176	–
177	–	ff = m->otype == MAT_DIRECT1 ? 4 : 8;
178	–	if (ff >= m->oargs.nsargs)
179	–	objerror(m, USER, "too few arguments");
180	–	if (!vardefined(m->oargs.sarg[0]))
181	–	loadfunc(m->oargs.sarg[ff]);
216		}

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