src/hd/rholo2.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 * Rtrace support routines for holodeck rendering
 */

#include "rholo.h"
#include "paths.h"
#include "random.h"


VIEWPOINT       myeye;          /* target view position */

struct gclim {
        HOLO    *hp;                    /* holodeck pointer */
        GCOORD  gc;                     /* grid cell */
        FVECT   egp;                    /* eye grid point */
        double  erg2;                   /* mean square eye grid range */
        double  gmin[2], gmax[2];       /* grid coordinate limits */
};                              /* a grid coordinate range */


static
initeyelim(gcl, hp, gc)         /* initialize grid coordinate limits */
register struct gclim   *gcl;
register HOLO   *hp;
GCOORD  *gc;
{
        register FLOAT  *v;
        register int    i;

        if (hp != NULL) {
                hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt);
                gcl->erg2 = 0;
                for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3)
                        gcl->erg2 += DOT(v,v);
                gcl->erg2 *= (1./3.) * myeye.rng*myeye.rng;
        }
        if (gc != NULL)
                copystruct(&gcl->gc, gc);
        gcl->gmin[0] = gcl->gmin[1] = FHUGE;
        gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
}


static
groweyelim(gcl, gc, r0, r1, tight)      /* grow grid limits about eye point */
register struct gclim   *gcl;
GCOORD  *gc;
double  r0, r1;
int     tight;
{
        FVECT   gp, ab;
        double  ab2, od, cfact;
        double  sqcoef[3], ctcoef[3], licoef[3], cnst;
        int     gw, gi[2];
        double  wallpos, a, b, c, d, e, f;
        double  root[2], yex;
        int     n, i, j, nex;
                                                /* point/view cone */
        i = gc->w>>1;
        gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0;
        gp[hdwg0[gc->w]] = gc->i[0] + r0;
        gp[hdwg1[gc->w]] = gc->i[1] + r1;
        VSUB(ab, gcl->egp, gp);
        ab2 = DOT(ab, ab);
        gw = gcl->gc.w>>1;
        if ((i==gw ? ab[gw]*ab[gw] : ab2)  <= gcl->erg2 + FTINY) {
                gcl->gmin[0] = gcl->gmin[1] = -FHUGE;
                gcl->gmax[0] = gcl->gmax[1] = FHUGE;
                return;                 /* too close (to wall) */
        }
        ab2 = 1./ab2;                           /* 1/norm2(ab) */
        od = DOT(gp, ab);                       /* origin dot direction */
        cfact = 1./(1. - ab2*gcl->erg2);        /* tan^2 + 1 of cone angle */
        for (i = 0; i < 3; i++) {               /* compute cone equation */
                sqcoef[i] = ab[i]*ab[i]*cfact*ab2 - 1.;
                ctcoef[i] = 2.*ab[i]*ab[(i+1)%3]*cfact*ab2;
                licoef[i] = 2.*(gp[i] - ab[i]*cfact*od*ab2);
        }
        cnst = cfact*od*od*ab2 - DOT(gp,gp);
        /*
         * CONE:        sqcoef[0]*x*x + sqcoef[1]*y*y + sqcoef[2]*z*z
         *              + ctcoef[0]*x*y + ctcoef[1]*y*z + ctcoef[2]*z*x
         *              + licoef[0]*x + licoef[1]*y + licoef[2]*z + cnst == 0
         */
                                /* equation for conic section in plane */
        gi[0] = hdwg0[gcl->gc.w];
        gi[1] = hdwg1[gcl->gc.w];
        wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0;
        a = sqcoef[gi[0]];                                      /* x2 */
        b = ctcoef[gi[0]];                                      /* xy */
        c = sqcoef[gi[1]];                                      /* y2 */
        d = ctcoef[gw]*wallpos + licoef[gi[0]];                 /* x */
        e = ctcoef[gi[1]]*wallpos + licoef[gi[1]];              /* y */
        f = wallpos*(wallpos*sqcoef[gw] + licoef[gw]) + cnst;
        for (i = 0; i < 2; i++) {
                if (i) {                /* swap x and y coefficients */
                        register double t;
                        t = a; a = c; c = t;
                        t = d; d = e; e = t;
                }
                nex = 0;                /* check global extrema */
                n = quadratic(root, a*(4.*a*c-b*b), 2.*a*(2.*c*d-b*e),
                                d*(c*d-b*e) + f*b*b);
                while (n-- > 0) {
                        if (gc->w>>1 == gi[i] &&
                                        (gc->w&1) ^ root[n] < gp[gc->w>>1]) {
                                if (gc->w&1)
                                        gcl->gmin[i] = -FHUGE;
                                else
                                        gcl->gmax[i] = FHUGE;
                                nex++;
                                continue;               /* hyperbolic */
                        }
                        if (tight) {
                                yex = (-2.*a*root[n] - d)/b;
                                if (yex < gcl->gc.i[1-i] ||
                                                yex > gcl->gc.i[1-i]+1)
                                        continue;       /* outside cell */
                        }
                        if (root[n] < gcl->gmin[i])
                                gcl->gmin[i] = root[n];
                        if (root[n] > gcl->gmax[i])
                                gcl->gmax[i] = root[n];
                        nex++;
                }
                                        /* check local extrema */
                for (j = nex < 2 ? 2 : 0; j--; ) {
                        yex = gcl->gc.i[1-i] + j;
                        n = quadratic(root, a, b*yex+d, yex*(yex*c+e)+f);
                        while (n-- > 0) {
                                if (gc->w>>1 == gi[i] &&
                                        (gc->w&1) ^ root[n] < gp[gc->w>>1])
                                        continue;
                                if (root[n] < gcl->gmin[i])
                                        gcl->gmin[i] = root[n];
                                if (root[n] > gcl->gmax[i])
                                        gcl->gmax[i] = root[n];
                        }
                }
        }
}


static int
clipeyelim(rrng, gcl)           /* clip eye limits to grid cell */
register short  rrng[2][2];
register struct gclim   *gcl;
{
        int     incell = 1;
        register int    i;

        for (i = 0; i < 2; i++) {
                if (gcl->gmin[i] < gcl->gc.i[i])
                        gcl->gmin[i] = gcl->gc.i[i];
                if (gcl->gmax[i] > gcl->gc.i[i]+1)
                        gcl->gmax[i] = gcl->gc.i[i]+1;
                if (gcl->gmax[i] > gcl->gmin[i]) {
                        rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) +
                                        (1.-FTINY);
                        rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) +
                                        (1.-FTINY) - rrng[i][0];
                } else
                        rrng[i][0] = rrng[i][1] = 0;
                incell &= rrng[i][1] > 0;
        }
        return(incell);
}


packrays(rod, p)                /* pack ray origins and directions */
register float  *rod;
register PACKET *p;
{
#if 0
        double  dist2sum = 0.;
        FVECT   vt;
#endif
        int     nretries = p->nr + 2;
        struct gclim    eyelim;
        short   rrng0[2][2], rrng1[2][2];
        int     useyelim;
        GCOORD  gc[2];
        FVECT   ro, rd;
        double  d;
        register int    i;

        if (!hdbcoord(gc, hdlist[p->hd], p->bi))
                error(CONSISTENCY, "bad beam index in packrays");
        if ((useyelim = myeye.rng > FTINY)) {
                initeyelim(&eyelim, hdlist[p->hd], gc);
                groweyelim(&eyelim, gc+1, 0., 0., 0);
                groweyelim(&eyelim, gc+1, 1., 1., 0);
                useyelim = clipeyelim(rrng0, &eyelim);
#ifdef DEBUG
                if (!useyelim)
                        error(WARNING, "no eye overlap in packrays");
#endif
        }
        for (i = 0; i < p->nr; i++) {
        retry:
                if (useyelim) {
                        initeyelim(&eyelim, NULL, gc+1);
                        p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1])
                                                + rrng0[0][0];
                        p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1])
                                                + rrng0[1][0];
                        groweyelim(&eyelim, gc,
                                        (1./256.)*(p->ra[i].r[0][0]+.5),
                                        (1./256.)*(p->ra[i].r[0][1]+.5), 1);
                        if (!clipeyelim(rrng1, &eyelim)) {
                                useyelim = nretries-- > 0;
#ifdef DEBUG
                                if (!useyelim)
                                        error(WARNING,
                                        "exceeded retry limit in packrays");
#endif
                                goto retry;
                        }
                        p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1])
                                                + rrng1[0][0];
                        p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1])
                                                + rrng1[1][0];
                } else {
                        p->ra[i].r[0][0] = frandom() * 256.;
                        p->ra[i].r[0][1] = frandom() * 256.;
                        p->ra[i].r[1][0] = frandom() * 256.;
                        p->ra[i].r[1][1] = frandom() * 256.;
                }
                d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r);
#if 0
                VSUM(vt, ro, rd, d);
                dist2sum += dist2line(myeye.vpt, ro, vt);
#endif
                if (p->offset != NULL) {
                        if (!vdef(OBSTRUCTIONS))
                                d *= frandom();         /* random offset */
                        VSUM(ro, ro, rd, d);            /* advance ray */
                        p->offset[i] = d;
                }
                VCOPY(rod, ro);
                rod += 3;
                VCOPY(rod, rd);
                rod += 3;
        }
#if 0
        fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr),
                        p->nr + 2 - nretries);
#endif
}


donerays(p, rvl)                /* encode finished ray computations */
register PACKET *p;
register float  *rvl;
{
        double  d;
        register int    i;

        for (i = 0; i < p->nr; i++) {
                setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]);
                d = rvl[3];
                if (p->offset != NULL)
                        d += p->offset[i];
                p->ra[i].d = hdcode(hdlist[p->hd], d);
                rvl += 4;
        }
        p->nc += p->nr;
}


int
done_rtrace()                   /* clean up and close rtrace calculation */
{
        int     status;
                                        /* already closed? */
        if (!nprocs)
                return;
                                        /* flush beam queue */
        done_packets(flush_queue());
                                        /* sync holodeck */
        hdsync(NULL, 1);
                                        /* close rtrace */
        if ((status = end_rtrace()))
                error(WARNING, "bad exit status from rtrace");
        if (vdef(REPORT)) {             /* report time */
                eputs("rtrace process closed\n");
                report(0);
        }
        return(status);                 /* return status */
}


new_rtrace()                    /* restart rtrace calculation */
{
        char    combuf[128];

        if (nprocs > 0)                 /* already running? */
                return;
        starttime = time(NULL);         /* reset start time and counts */
        npacksdone = nraysdone = 0L;
        if (vdef(TIME))                 /* reset end time */
                endtime = starttime + vflt(TIME)*3600. + .5;
        if (vdef(RIF)) {                /* rerun rad to update octree */
                sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF));
                if (system(combuf))
                        error(WARNING, "error running rad");
        }
        if (start_rtrace() < 1)         /* start rtrace */
                error(WARNING, "cannot restart rtrace");
        else if (vdef(REPORT)) {
                eputs("rtrace process restarted\n");
                report(0);
        }
}


getradfile()                    /* run rad and get needed variables */
{
        static short    mvar[] = {OCTREE,EYESEP,-1};
        static char     tf1[] = TEMPLATE;
        char    tf2[64];
        char    combuf[256];
        char    *pippt;
        register int    i;
        register char   *cp;
                                        /* check if rad file specified */
        if (!vdef(RIF))
                return(0);
                                        /* create rad command */
        mktemp(tf1);
        sprintf(tf2, "%s.rif", tf1);
        sprintf(combuf,
                "rad -v 0 -s -e -w %s OPTFILE=%s | egrep '^[ \t]*(NOMATCH",
                        vval(RIF), tf1);
        cp = combuf;
        while (*cp){
                if (*cp == '|') pippt = cp;
                cp++;
        }                               /* match unset variables */
        for (i = 0; mvar[i] >= 0; i++)
                if (!vdef(mvar[i])) {
                        *cp++ = '|';
                        strcpy(cp, vnam(mvar[i]));
                        while (*cp) cp++;
                        pippt = NULL;
                }
        if (pippt != NULL)
                strcpy(pippt, "> /dev/null");   /* nothing to match */
        else
                sprintf(cp, ")[ \t]*=' > %s", tf2);
#ifdef DEBUG
        wputs(combuf); wputs("\n");
#endif
        system(combuf);                         /* ignore exit code */
        if (pippt == NULL) {
                loadvars(tf2);                  /* load variables */
                unlink(tf2);
        }
        rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
        unlink(tf1);                    /* clean up */
        return(1);
}


report(t)                       /* report progress so far */
time_t  t;
{
        static time_t   seconds2go = 1000000;

        if (t == 0L)
                t = time(NULL);
        sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
                        npacksdone, nraysdone, (t-starttime)/3600.);
        eputs(errmsg);
        if (seconds2go == 1000000)
                seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
        if (seconds2go)
                reporttime = t + seconds2go;
}
Revision:	3.22
Committed:	Sat Feb 22 02:07:25 2003 UTC (22 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 3.21:	+1 -4 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	User	Rev	Content
1	gregl	3.1	#ifndef lint
2	greg	3.22	static const char RCSid[] = "$Id$";
3	gregl	3.1	#endif
4			/*
5			* Rtrace support routines for holodeck rendering
6			*/
7
8			#include "rholo.h"
9	gregl	3.5	#include "paths.h"
10	gregl	3.1	#include "random.h"
11
12
13	gwlarson	3.16	VIEWPOINT myeye; /* target view position */
14
15	gwlarson	3.19	struct gclim {
16			HOLO hp; / holodeck pointer */
17			GCOORD gc; /* grid cell */
18			FVECT egp; /* eye grid point */
19	gwlarson	3.20	double erg2; /* mean square eye grid range */
20	gwlarson	3.19	double gmin[2], gmax[2]; /* grid coordinate limits */
21			}; /* a grid coordinate range */
22	gwlarson	3.16
23	gwlarson	3.19
24			static
25	gwlarson	3.20	initeyelim(gcl, hp, gc) /* initialize grid coordinate limits */
26	gwlarson	3.19	register struct gclim *gcl;
27	gwlarson	3.20	register HOLO *hp;
28	gwlarson	3.19	GCOORD *gc;
29			{
30			register FLOAT *v;
31			register int i;
32
33	gwlarson	3.20	if (hp != NULL) {
34			hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt);
35			gcl->erg2 = 0;
36			for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3)
37			gcl->erg2 += DOT(v,v);
38			gcl->erg2 = (1./3.) myeye.rng*myeye.rng;
39	gwlarson	3.19	}
40	gwlarson	3.20	if (gc != NULL)
41			copystruct(&gcl->gc, gc);
42			gcl->gmin[0] = gcl->gmin[1] = FHUGE;
43			gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
44	gwlarson	3.19	}
45
46
47			static
48	gwlarson	3.21	groweyelim(gcl, gc, r0, r1, tight) /* grow grid limits about eye point */
49	gwlarson	3.19	register struct gclim *gcl;
50	gwlarson	3.20	GCOORD *gc;
51			double r0, r1;
52	gwlarson	3.21	int tight;
53	gwlarson	3.19	{
54	gwlarson	3.20	FVECT gp, ab;
55	gwlarson	3.21	double ab2, od, cfact;
56			double sqcoef[3], ctcoef[3], licoef[3], cnst;
57			int gw, gi[2];
58			double wallpos, a, b, c, d, e, f;
59			double root[2], yex;
60			int n, i, j, nex;
61			/* point/view cone */
62	gwlarson	3.20	i = gc->w>>1;
63	gwlarson	3.21	gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0;
64	gwlarson	3.20	gp[hdwg0[gc->w]] = gc->i[0] + r0;
65			gp[hdwg1[gc->w]] = gc->i[1] + r1;
66	gwlarson	3.19	VSUB(ab, gcl->egp, gp);
67	gwlarson	3.21	ab2 = DOT(ab, ab);
68			gw = gcl->gc.w>>1;
69			if ((i==gw ? ab[gw]*ab[gw] : ab2) <= gcl->erg2 + FTINY) {
70	gwlarson	3.19	gcl->gmin[0] = gcl->gmin[1] = -FHUGE;
71			gcl->gmax[0] = gcl->gmax[1] = FHUGE;
72	gwlarson	3.21	return; /* too close (to wall) */
73	gwlarson	3.19	}
74	gwlarson	3.21	ab2 = 1./ab2; /* 1/norm2(ab) */
75			od = DOT(gp, ab); /* origin dot direction */
76			cfact = 1./(1. - ab2gcl->erg2); / tan^2 + 1 of cone angle */
77			for (i = 0; i < 3; i++) { /* compute cone equation */
78			sqcoef[i] = ab[i]ab[i]cfact*ab2 - 1.;
79			ctcoef[i] = 2.ab[i]ab[(i+1)%3]cfactab2;
80			licoef[i] = 2.(gp[i] - ab[i]cfactodab2);
81			}
82			cnst = cfactodod*ab2 - DOT(gp,gp);
83			/*
84			* CONE: sqcoef[0]xx + sqcoef[1]yy + sqcoef[2]zz
85			* + ctcoef[0]xy + ctcoef[1]yz + ctcoef[2]zx
86			* + licoef[0]x + licoef[1]y + licoef[2]*z + cnst == 0
87			*/
88			/* equation for conic section in plane */
89			gi[0] = hdwg0[gcl->gc.w];
90			gi[1] = hdwg1[gcl->gc.w];
91			wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0;
92			a = sqcoef[gi[0]]; /* x2 */
93			b = ctcoef[gi[0]]; /* xy */
94			c = sqcoef[gi[1]]; /* y2 */
95			d = ctcoef[gw]wallpos + licoef[gi[0]]; / x */
96			e = ctcoef[gi[1]]wallpos + licoef[gi[1]]; / y */
97			f = wallpos(wallpossqcoef[gw] + licoef[gw]) + cnst;
98			for (i = 0; i < 2; i++) {
99			if (i) { /* swap x and y coefficients */
100			register double t;
101			t = a; a = c; c = t;
102			t = d; d = e; e = t;
103	gwlarson	3.20	}
104	gwlarson	3.21	nex = 0; /* check global extrema */
105			n = quadratic(root, a(4.ac-bb), 2.a(2.cd-b*e),
106			d(cd-be) + fb*b);
107			while (n-- > 0) {
108			if (gc->w>>1 == gi[i] &&
109			(gc->w&1) ^ root[n] < gp[gc->w>>1]) {
110			if (gc->w&1)
111			gcl->gmin[i] = -FHUGE;
112			else
113			gcl->gmax[i] = FHUGE;
114			nex++;
115			continue; /* hyperbolic */
116			}
117			if (tight) {
118			yex = (-2.aroot[n] - d)/b;
119			if (yex < gcl->gc.i[1-i] \|\|
120			yex > gcl->gc.i[1-i]+1)
121			continue; /* outside cell */
122			}
123			if (root[n] < gcl->gmin[i])
124			gcl->gmin[i] = root[n];
125			if (root[n] > gcl->gmax[i])
126			gcl->gmax[i] = root[n];
127			nex++;
128			}
129			/* check local extrema */
130			for (j = nex < 2 ? 2 : 0; j--; ) {
131			yex = gcl->gc.i[1-i] + j;
132			n = quadratic(root, a, byex+d, yex(yex*c+e)+f);
133			while (n-- > 0) {
134			if (gc->w>>1 == gi[i] &&
135			(gc->w&1) ^ root[n] < gp[gc->w>>1])
136			continue;
137			if (root[n] < gcl->gmin[i])
138			gcl->gmin[i] = root[n];
139			if (root[n] > gcl->gmax[i])
140			gcl->gmax[i] = root[n];
141			}
142			}
143	gwlarson	3.19	}
144			}
145
146
147			static int
148			clipeyelim(rrng, gcl) /* clip eye limits to grid cell */
149			register short rrng[2][2];
150			register struct gclim *gcl;
151			{
152			int incell = 1;
153			register int i;
154
155			for (i = 0; i < 2; i++) {
156			if (gcl->gmin[i] < gcl->gc.i[i])
157			gcl->gmin[i] = gcl->gc.i[i];
158			if (gcl->gmax[i] > gcl->gc.i[i]+1)
159			gcl->gmax[i] = gcl->gc.i[i]+1;
160	gwlarson	3.20	if (gcl->gmax[i] > gcl->gmin[i]) {
161	gwlarson	3.19	rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) +
162			(1.-FTINY);
163			rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) +
164			(1.-FTINY) - rrng[i][0];
165	gwlarson	3.20	} else
166			rrng[i][0] = rrng[i][1] = 0;
167			incell &= rrng[i][1] > 0;
168	gwlarson	3.19	}
169			return(incell);
170			}
171
172
173	gregl	3.1	packrays(rod, p) /* pack ray origins and directions */
174	gwlarson	3.15	register float *rod;
175	gregl	3.1	register PACKET *p;
176			{
177	gwlarson	3.21	#if 0
178			double dist2sum = 0.;
179			FVECT vt;
180			#endif
181	gwlarson	3.19	int nretries = p->nr + 2;
182			struct gclim eyelim;
183			short rrng0[2][2], rrng1[2][2];
184			int useyelim;
185	gregl	3.3	GCOORD gc[2];
186	gwlarson	3.19	FVECT ro, rd;
187			double d;
188			register int i;
189	gregl	3.1
190			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
191			error(CONSISTENCY, "bad beam index in packrays");
192	gwlarson	3.19	if ((useyelim = myeye.rng > FTINY)) {
193	gwlarson	3.20	initeyelim(&eyelim, hdlist[p->hd], gc);
194	gwlarson	3.21	groweyelim(&eyelim, gc+1, 0., 0., 0);
195			groweyelim(&eyelim, gc+1, 1., 1., 0);
196			useyelim = clipeyelim(rrng0, &eyelim);
197			#ifdef DEBUG
198			if (!useyelim)
199			error(WARNING, "no eye overlap in packrays");
200			#endif
201	gwlarson	3.19	}
202			for (i = 0; i < p->nr; i++) {
203			retry:
204			if (useyelim) {
205	gwlarson	3.20	initeyelim(&eyelim, NULL, gc+1);
206	gwlarson	3.19	p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1])
207			+ rrng0[0][0];
208			p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1])
209			+ rrng0[1][0];
210	gwlarson	3.20	groweyelim(&eyelim, gc,
211			(1./256.)*(p->ra[i].r[0][0]+.5),
212	gwlarson	3.21	(1./256.)*(p->ra[i].r[0][1]+.5), 1);
213	gwlarson	3.19	if (!clipeyelim(rrng1, &eyelim)) {
214	gwlarson	3.21	useyelim = nretries-- > 0;
215			#ifdef DEBUG
216			if (!useyelim)
217			error(WARNING,
218			"exceeded retry limit in packrays");
219			#endif
220	gwlarson	3.19	goto retry;
221			}
222			p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1])
223			+ rrng1[0][0];
224			p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1])
225			+ rrng1[1][0];
226			} else {
227			p->ra[i].r[0][0] = frandom() * 256.;
228			p->ra[i].r[0][1] = frandom() * 256.;
229			p->ra[i].r[1][0] = frandom() * 256.;
230			p->ra[i].r[1][1] = frandom() * 256.;
231			}
232			d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r);
233	gwlarson	3.21	#if 0
234			VSUM(vt, ro, rd, d);
235			dist2sum += dist2line(myeye.vpt, ro, vt);
236			#endif
237	gregl	3.1	if (p->offset != NULL) {
238	gwlarson	3.16	if (!vdef(OBSTRUCTIONS))
239			d = frandom(); / random offset */
240	gregl	3.8	VSUM(ro, ro, rd, d); /* advance ray */
241	gwlarson	3.19	p->offset[i] = d;
242	gregl	3.1	}
243	gwlarson	3.19	VCOPY(rod, ro);
244			rod += 3;
245			VCOPY(rod, rd);
246			rod += 3;
247	gregl	3.1	}
248	gwlarson	3.21	#if 0
249			fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr),
250			p->nr + 2 - nretries);
251			#endif
252	gregl	3.1	}
253
254
255			donerays(p, rvl) /* encode finished ray computations */
256			register PACKET *p;
257			register float *rvl;
258			{
259			double d;
260			register int i;
261
262			for (i = 0; i < p->nr; i++) {
263			setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]);
264			d = rvl[3];
265			if (p->offset != NULL)
266			d += p->offset[i];
267			p->ra[i].d = hdcode(hdlist[p->hd], d);
268			rvl += 4;
269			}
270	gregl	3.4	p->nc += p->nr;
271	gregl	3.5	}
272
273
274			int
275			done_rtrace() /* clean up and close rtrace calculation */
276			{
277			int status;
278			/* already closed? */
279			if (!nprocs)
280			return;
281			/* flush beam queue */
282			done_packets(flush_queue());
283	gregl	3.7	/* sync holodeck */
284			hdsync(NULL, 1);
285	gregl	3.5	/* close rtrace */
286			if ((status = end_rtrace()))
287			error(WARNING, "bad exit status from rtrace");
288	gregl	3.9	if (vdef(REPORT)) { /* report time */
289	gregl	3.10	eputs("rtrace process closed\n");
290	gregl	3.5	report(0);
291	gregl	3.9	}
292	gregl	3.5	return(status); /* return status */
293			}
294
295
296			new_rtrace() /* restart rtrace calculation */
297			{
298			char combuf[128];
299
300			if (nprocs > 0) /* already running? */
301			return;
302	gregl	3.6	starttime = time(NULL); /* reset start time and counts */
303			npacksdone = nraysdone = 0L;
304			if (vdef(TIME)) /* reset end time */
305			endtime = starttime + vflt(TIME)*3600. + .5;
306	gregl	3.5	if (vdef(RIF)) { /* rerun rad to update octree */
307			sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF));
308			if (system(combuf))
309			error(WARNING, "error running rad");
310			}
311			if (start_rtrace() < 1) /* start rtrace */
312			error(WARNING, "cannot restart rtrace");
313	gregl	3.9	else if (vdef(REPORT)) {
314			eputs("rtrace process restarted\n");
315	gregl	3.5	report(0);
316	gregl	3.9	}
317	gregl	3.5	}
318
319
320			getradfile() /* run rad and get needed variables */
321			{
322	gwlarson	3.12	static short mvar[] = {OCTREE,EYESEP,-1};
323	gregl	3.5	static char tf1[] = TEMPLATE;
324			char tf2[64];
325			char combuf[256];
326			char *pippt;
327			register int i;
328			register char *cp;
329			/* check if rad file specified */
330			if (!vdef(RIF))
331	gregl	3.11	return(0);
332	gregl	3.5	/* create rad command */
333			mktemp(tf1);
334			sprintf(tf2, "%s.rif", tf1);
335			sprintf(combuf,
336			"rad -v 0 -s -e -w %s OPTFILE=%s \| egrep '^[ \t]*(NOMATCH",
337			vval(RIF), tf1);
338			cp = combuf;
339			while (*cp){
340			if (*cp == '\|') pippt = cp;
341			cp++;
342			} /* match unset variables */
343			for (i = 0; mvar[i] >= 0; i++)
344			if (!vdef(mvar[i])) {
345			*cp++ = '\|';
346			strcpy(cp, vnam(mvar[i]));
347			while (*cp) cp++;
348			pippt = NULL;
349			}
350			if (pippt != NULL)
351			strcpy(pippt, "> /dev/null"); /* nothing to match */
352			else
353			sprintf(cp, ")[ \t]*=' > %s", tf2);
354	gwlarson	3.13	#ifdef DEBUG
355			wputs(combuf); wputs("\n");
356			#endif
357			system(combuf); /* ignore exit code */
358	gregl	3.5	if (pippt == NULL) {
359			loadvars(tf2); /* load variables */
360			unlink(tf2);
361			}
362			rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
363			unlink(tf1); /* clean up */
364	gregl	3.11	return(1);
365	gregl	3.6	}
366
367
368			report(t) /* report progress so far */
369			time_t t;
370			{
371			static time_t seconds2go = 1000000;
372
373			if (t == 0L)
374			t = time(NULL);
375			sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
376			npacksdone, nraysdone, (t-starttime)/3600.);
377			eputs(errmsg);
378			if (seconds2go == 1000000)
379			seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
380			if (seconds2go)
381			reporttime = t + seconds2go;
382	gregl	3.1	}