src/rt/m_direct.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 * Routines for light-redirecting materials and
 *   their associated virtual light sources
 */

#include "copyright.h"

#include  "ray.h"

#include  "otypes.h"

#include  "source.h"

#include  "func.h"

/*
 * The arguments for MAT_DIRECT1 are:
 *
 *      5+ coef1 dx1 dy1 dz1 funcfile transform..
 *      0
 *      n A1 A2 .. An
 *
 * The arguments for MAT_DIRECT2 are:
 *
 *      9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform..
 *      0
 *      n A1 A2 .. An
 */


static int  dir_proj();

VSMATERIAL  direct1_vs = {dir_proj, 1};
VSMATERIAL  direct2_vs = {dir_proj, 2};

#define getdfunc(m)     ( (m)->otype == MAT_DIRECT1 ? \
                                getfunc(m, 4, 0xf, 1) : \
                                getfunc(m, 8, 0xff, 1) )


int
m_direct(m, r)                  /* shade redirected ray */
register OBJREC  *m;
register RAY  *r;
{
                                        /* check if source ray */
        if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
                return(1);                      /* got the wrong guy */
                                        /* compute first projection */
        if (m->otype == MAT_DIRECT1 ||
                        (r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0))
                redirect(m, r, 0);
                                        /* compute second projection */
        if (m->otype == MAT_DIRECT2 &&
                        (r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1))
                redirect(m, r, 1);
        return(1);
}


int
redirect(m, r, n)               /* compute n'th ray redirection */
OBJREC  *m;
RAY  *r;
int  n;
{
        MFUNC  *mf;
        register EPNODE  **va;
        FVECT  nsdir;
        RAY  nr;
        double  coef;
        register int  j;
                                        /* set up function */
        mf = getdfunc(m);
        setfunc(m, r);
                                        /* assign direction variable */
        if (r->rsrc >= 0) {
                register SRCREC  *sp = source + source[r->rsrc].sa.sv.sn;

                if (sp->sflags & SDISTANT)
                        VCOPY(nsdir, sp->sloc);
                else {
                        for (j = 0; j < 3; j++)
                                nsdir[j] = sp->sloc[j] - r->rop[j];
                        normalize(nsdir);
                }
                multv3(nsdir, nsdir, funcxf.xfm);
                varset("DxA", '=', nsdir[0]/funcxf.sca);
                varset("DyA", '=', nsdir[1]/funcxf.sca);
                varset("DzA", '=', nsdir[2]/funcxf.sca);
        } else {
                varset("DxA", '=', 0.0);
                varset("DyA", '=', 0.0);
                varset("DzA", '=', 0.0);
        }
                                        /* compute coefficient */
        errno = 0;
        va = mf->ep + 4*n;
        coef = evalue(va[0]);
        if (errno == EDOM || errno == ERANGE)
                goto computerr;
        if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0)
                return(0);
        va++;                           /* compute direction */
        for (j = 0; j < 3; j++) {
                nr.rdir[j] = evalue(va[j]);
                if (errno == EDOM || errno == ERANGE)
                        goto computerr;
        }
        if (mf->f != &unitxf)
                multv3(nr.rdir, nr.rdir, mf->f->xfm);
        if (r->rox != NULL)
                multv3(nr.rdir, nr.rdir, r->rox->f.xfm);
        if (normalize(nr.rdir) == 0.0)
                goto computerr;
                                        /* compute value */
        if (r->rsrc >= 0)
                nr.rsrc = source[r->rsrc].sa.sv.sn;
        rayvalue(&nr);
        scalecolor(nr.rcol, coef);
        addcolor(r->rcol, nr.rcol);
        if (r->ro != NULL && isflat(r->ro->otype))
                r->rt = r->rot + nr.rt;
        return(1);
computerr:
        objerror(m, WARNING, "compute error");
        return(-1);
}


static int
dir_proj(pm, o, s, n)           /* compute a director's projection */
MAT4  pm;
OBJREC  *o;
SRCREC  *s;
int  n;
{
        RAY  tr;
        OBJREC  *m;
        MFUNC  *mf;
        EPNODE  **va;
        FVECT  cent, newdir, nv, h;
        double  coef, olddot, newdot, od;
        register int  i, j;
                                /* initialize test ray */
        getmaxdisk(cent, o);
        if (s->sflags & SDISTANT)
                for (i = 0; i < 3; i++) {
                        tr.rdir[i] = -s->sloc[i];
                        tr.rorg[i] = cent[i] - tr.rdir[i];
                }
        else {
                for (i = 0; i < 3; i++) {
                        tr.rdir[i] = cent[i] - s->sloc[i];
                        tr.rorg[i] = s->sloc[i];
                }
                if (normalize(tr.rdir) == 0.0)
                        return(0);              /* at source! */
        }
        od = getplaneq(nv, o);
        olddot = DOT(tr.rdir, nv);
        if (olddot <= FTINY && olddot >= -FTINY)
                return(0);              /* old dir parallels plane */
        tr.rmax = 0.0;
        rayorigin(&tr, NULL, PRIMARY, 1.0);
        if (!(*ofun[o->otype].funp)(o, &tr))
                return(0);              /* no intersection! */
                                /* compute redirection */
        m = vsmaterial(o);
        mf = getdfunc(m);
        setfunc(m, &tr);
        varset("DxA", '=', 0.0);
        varset("DyA", '=', 0.0);
        varset("DzA", '=', 0.0);
        errno = 0;
        va = mf->ep + 4*n;
        coef = evalue(va[0]);
        if (errno == EDOM || errno == ERANGE)
                goto computerr;
        if (coef <= FTINY)
                return(0);              /* insignificant */
        va++;
        for (i = 0; i < 3; i++) {
                newdir[i] = evalue(va[i]);
                if (errno == EDOM || errno == ERANGE)
                        goto computerr;
        }
        if (mf->f != &unitxf)
                multv3(newdir, newdir, mf->f->xfm);
                                        /* normalization unnecessary */
        newdot = DOT(newdir, nv);
        if (newdot <= FTINY && newdot >= -FTINY)
                return(0);              /* new dir parallels plane */
                                /* everything OK -- compute shear */
        for (i = 0; i < 3; i++)
                h[i] = newdir[i]/newdot - tr.rdir[i]/olddot;
        setident4(pm);
        for (j = 0; j < 3; j++) {
                for (i = 0; i < 3; i++)
                        pm[i][j] += nv[i]*h[j];
                pm[3][j] = -od*h[j];
        }
        if (newdot > 0.0 ^ olddot > 0.0)        /* add mirroring */
                for (j = 0; j < 3; j++) {
                        for (i = 0; i < 3; i++)
                                pm[i][j] -= 2.*nv[i]*nv[j];
                        pm[3][j] += 2.*od*nv[j];
                }
        return(1);
computerr:
        objerror(m, WARNING, "projection compute error");
        return(0);
}
Revision:	2.10
Committed:	Wed Mar 5 16:16:53 2003 UTC (22 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 2.9:	+4 -4 lines
Log Message:	Made errno checking explicit after math calls to avoid spurious warnings
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.8	static const char RCSid[] = "$Id$";
3	greg	1.1	#endif
4			/*
5			* Routines for light-redirecting materials and
6			* their associated virtual light sources
7			*/
8
9	greg	2.9	#include "copyright.h"
10	greg	2.8
11	greg	1.1	#include "ray.h"
12
13			#include "otypes.h"
14
15			#include "source.h"
16
17	greg	2.2	#include "func.h"
18
19	greg	1.1	/*
20			* The arguments for MAT_DIRECT1 are:
21			*
22	greg	1.3	* 5+ coef1 dx1 dy1 dz1 funcfile transform..
23	greg	1.1	* 0
24			* n A1 A2 .. An
25			*
26			* The arguments for MAT_DIRECT2 are:
27			*
28	greg	1.3	* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform..
29	greg	1.1	* 0
30			* n A1 A2 .. An
31			*/
32
33
34	greg	2.8	static int dir_proj();
35
36	greg	1.1	VSMATERIAL direct1_vs = {dir_proj, 1};
37			VSMATERIAL direct2_vs = {dir_proj, 2};
38
39	greg	2.2	#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \
40			getfunc(m, 4, 0xf, 1) : \
41			getfunc(m, 8, 0xff, 1) )
42	greg	1.1
43	greg	1.6
44	greg	2.8	int
45	greg	1.1	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	greg	2.4	return(1); /* got the wrong guy */
52	greg	1.1	/* compute first projection */
53			if (m->otype == MAT_DIRECT1 \|\|
54			(r->rsrc < 0 \|\| source[r->rsrc].sa.sv.pn == 0))
55			redirect(m, r, 0);
56			/* compute second projection */
57			if (m->otype == MAT_DIRECT2 &&
58			(r->rsrc < 0 \|\| source[r->rsrc].sa.sv.pn == 1))
59			redirect(m, r, 1);
60	greg	2.4	return(1);
61	greg	1.1	}
62
63
64	greg	2.8	int
65	greg	1.1	redirect(m, r, n) /* compute n'th ray redirection */
66			OBJREC *m;
67			RAY *r;
68			int n;
69			{
70	greg	2.2	MFUNC *mf;
71			register EPNODE **va;
72	greg	2.3	FVECT nsdir;
73	greg	1.1	RAY nr;
74			double coef;
75			register int j;
76			/* set up function */
77	greg	2.2	mf = getdfunc(m);
78			setfunc(m, r);
79	greg	2.3	/* 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	greg	2.6	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	greg	1.1	/* compute coefficient */
100			errno = 0;
101	greg	2.2	va = mf->ep + 4*n;
102			coef = evalue(va[0]);
103	greg	2.10	if (errno == EDOM \|\| errno == ERANGE)
104	greg	1.1	goto computerr;
105			if (coef <= FTINY \|\| rayorigin(&nr, r, TRANS, coef) < 0)
106			return(0);
107	greg	2.2	va++; /* compute direction */
108			for (j = 0; j < 3; j++) {
109			nr.rdir[j] = evalue(va[j]);
110	greg	2.10	if (errno == EDOM \|\| errno == ERANGE)
111	greg	2.2	goto computerr;
112			}
113			if (mf->f != &unitxf)
114			multv3(nr.rdir, nr.rdir, mf->f->xfm);
115	greg	1.4	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	greg	1.1	/* compute value */
120			if (r->rsrc >= 0)
121			nr.rsrc = source[r->rsrc].sa.sv.sn;
122			rayvalue(&nr);
123			scalecolor(nr.rcol, coef);
124			addcolor(r->rcol, nr.rcol);
125	greg	2.7	if (r->ro != NULL && isflat(r->ro->otype))
126			r->rt = r->rot + nr.rt;
127	greg	1.1	return(1);
128			computerr:
129			objerror(m, WARNING, "compute error");
130			return(-1);
131			}
132
133
134	greg	2.8	static int
135	greg	1.1	dir_proj(pm, o, s, n) /* compute a director's projection */
136			MAT4 pm;
137			OBJREC *o;
138			SRCREC *s;
139			int n;
140			{
141			RAY tr;
142	greg	2.2	OBJREC *m;
143			MFUNC *mf;
144			EPNODE **va;
145	greg	1.1	FVECT cent, newdir, nv, h;
146	greg	2.2	double coef, olddot, newdot, od;
147	greg	1.1	register int i, j;
148			/* initialize test ray */
149			getmaxdisk(cent, o);
150			if (s->sflags & SDISTANT)
151			for (i = 0; i < 3; i++) {
152			tr.rdir[i] = -s->sloc[i];
153			tr.rorg[i] = cent[i] - tr.rdir[i];
154			}
155			else {
156			for (i = 0; i < 3; i++) {
157			tr.rdir[i] = cent[i] - s->sloc[i];
158	greg	1.2	tr.rorg[i] = s->sloc[i];
159	greg	1.1	}
160			if (normalize(tr.rdir) == 0.0)
161			return(0); /* at source! */
162			}
163			od = getplaneq(nv, o);
164			olddot = DOT(tr.rdir, nv);
165			if (olddot <= FTINY && olddot >= -FTINY)
166			return(0); /* old dir parallels plane */
167	greg	2.5	tr.rmax = 0.0;
168	greg	1.1	rayorigin(&tr, NULL, PRIMARY, 1.0);
169			if (!(*ofun[o->otype].funp)(o, &tr))
170			return(0); /* no intersection! */
171			/* compute redirection */
172	greg	2.2	m = vsmaterial(o);
173			mf = getdfunc(m);
174			setfunc(m, &tr);
175	greg	2.3	varset("DxA", '=', 0.0);
176			varset("DyA", '=', 0.0);
177			varset("DzA", '=', 0.0);
178	greg	1.1	errno = 0;
179	greg	2.2	va = mf->ep + 4*n;
180			coef = evalue(va[0]);
181	greg	2.10	if (errno == EDOM \|\| errno == ERANGE)
182	greg	1.1	goto computerr;
183	greg	2.2	if (coef <= FTINY)
184			return(0); /* insignificant */
185			va++;
186			for (i = 0; i < 3; i++) {
187			newdir[i] = evalue(va[i]);
188	greg	2.10	if (errno == EDOM \|\| errno == ERANGE)
189	greg	2.2	goto computerr;
190			}
191			if (mf->f != &unitxf)
192			multv3(newdir, newdir, mf->f->xfm);
193	greg	1.4	/* normalization unnecessary */
194	greg	1.1	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	greg	1.4	h[i] = newdir[i]/newdot - tr.rdir[i]/olddot;
200	greg	1.1	setident4(pm);
201			for (j = 0; j < 3; j++) {
202			for (i = 0; i < 3; i++)
203			pm[i][j] += nv[i]*h[j];
204			pm[3][j] = -od*h[j];
205			}
206			if (newdot > 0.0 ^ olddot > 0.0) /* add mirroring */
207			for (j = 0; j < 3; j++) {
208			for (i = 0; i < 3; i++)
209			pm[i][j] -= 2.nv[i]nv[j];
210			pm[3][j] += 2.odnv[j];
211			}
212			return(1);
213			computerr:
214			objerror(m, WARNING, "projection compute error");
215			return(0);
216			}