src/hd/rholo2.c

#ifndef lint
static const char       RCSid[] = "$Id: rholo2.c,v 3.27 2003/07/27 22:12:02 schorsch Exp $";
#endif
/*
 * Rtrace support routines for holodeck rendering
 */

#include <time.h>

#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 void initeyelim(struct gclim     *gcl, HOLO      *hp, GCOORD     *gc);
static void groweyelim(struct gclim *gcl, GCOORD *gc,
                double r0, double r1, int tight);
static int clipeyelim(short     rrng[2][2], struct gclim        *gcl);


static void
initeyelim(             /* initialize grid coordinate limits */
        register struct gclim   *gcl,
        register HOLO   *hp,
        GCOORD  *gc
)
{
        register RREAL  *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)
                gcl->gc = *gc;
        gcl->gmin[0] = gcl->gmin[1] = FHUGE;
        gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
}


static void
groweyelim(     /* grow grid limits about eye point */
        register struct gclim   *gcl,
        GCOORD  *gc,
        double  r0,
        double  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(             /* 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);
}


extern void
packrays(               /* 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
}


extern void
donerays(               /* 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;
}


extern int
done_rtrace(void)                       /* clean up and close rtrace calculation */
{
        int     status;
                                        /* already closed? */
        if (!nprocs)
                return(0);
                                        /* 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 */
}


extern void
new_rtrace(void)                        /* 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);
        }
}


extern int
getradfile(void)                        /* run rad and get needed variables */
{
        static short    mvar[] = {OCTREE,EYESEP,-1};
        static char     tf1[] = TEMPLATE;
        char    tf2[64];
        char    combuf[256];
        char    *pippt = NULL;
        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, "> " NULL_DEVICE);        /* 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);
}


extern void
report(                 /* 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:	3.28
Committed:	Thu Jan 1 11:21:55 2004 UTC (20 years, 10 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2P2, rad5R0, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1
Changes since 3.27:	+47 -28 lines
Log Message:	Ansification and prototypes.
#	User	Rev	Content
1	gregl	3.1	#ifndef lint
2	schorsch	3.28	static const char RCSid[] = "$Id: rholo2.c,v 3.27 2003/07/27 22:12:02 schorsch Exp $";
3	gregl	3.1	#endif
4			/*
5			* Rtrace support routines for holodeck rendering
6			*/
7
8	schorsch	3.28	#include <time.h>
9
10	gregl	3.1	#include "rholo.h"
11	gregl	3.5	#include "paths.h"
12	gregl	3.1	#include "random.h"
13
14
15	gwlarson	3.16	VIEWPOINT myeye; /* target view position */
16
17	gwlarson	3.19	struct gclim {
18			HOLO hp; / holodeck pointer */
19			GCOORD gc; /* grid cell */
20			FVECT egp; /* eye grid point */
21	gwlarson	3.20	double erg2; /* mean square eye grid range */
22	gwlarson	3.19	double gmin[2], gmax[2]; /* grid coordinate limits */
23			}; /* a grid coordinate range */
24	gwlarson	3.16
25	schorsch	3.28	static void initeyelim(struct gclim gcl, HOLO hp, GCOORD *gc);
26			static void groweyelim(struct gclim gcl, GCOORD gc,
27			double r0, double r1, int tight);
28			static int clipeyelim(short rrng[2][2], struct gclim *gcl);
29
30	gwlarson	3.19
31	schorsch	3.28	static void
32			initeyelim( /* initialize grid coordinate limits */
33			register struct gclim *gcl,
34			register HOLO *hp,
35			GCOORD *gc
36			)
37	gwlarson	3.19	{
38	schorsch	3.23	register RREAL *v;
39	gwlarson	3.19	register int i;
40
41	gwlarson	3.20	if (hp != NULL) {
42			hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt);
43			gcl->erg2 = 0;
44			for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3)
45			gcl->erg2 += DOT(v,v);
46			gcl->erg2 = (1./3.) myeye.rng*myeye.rng;
47	gwlarson	3.19	}
48	gwlarson	3.20	if (gc != NULL)
49	schorsch	3.26	gcl->gc = *gc;
50	gwlarson	3.20	gcl->gmin[0] = gcl->gmin[1] = FHUGE;
51			gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
52	gwlarson	3.19	}
53
54
55	schorsch	3.28	static void
56			groweyelim( /* grow grid limits about eye point */
57			register struct gclim *gcl,
58			GCOORD *gc,
59			double r0,
60			double r1,
61			int tight
62			)
63	gwlarson	3.19	{
64	gwlarson	3.20	FVECT gp, ab;
65	gwlarson	3.21	double ab2, od, cfact;
66			double sqcoef[3], ctcoef[3], licoef[3], cnst;
67			int gw, gi[2];
68			double wallpos, a, b, c, d, e, f;
69			double root[2], yex;
70			int n, i, j, nex;
71			/* point/view cone */
72	gwlarson	3.20	i = gc->w>>1;
73	gwlarson	3.21	gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0;
74	gwlarson	3.20	gp[hdwg0[gc->w]] = gc->i[0] + r0;
75			gp[hdwg1[gc->w]] = gc->i[1] + r1;
76	gwlarson	3.19	VSUB(ab, gcl->egp, gp);
77	gwlarson	3.21	ab2 = DOT(ab, ab);
78			gw = gcl->gc.w>>1;
79			if ((i==gw ? ab[gw]*ab[gw] : ab2) <= gcl->erg2 + FTINY) {
80	gwlarson	3.19	gcl->gmin[0] = gcl->gmin[1] = -FHUGE;
81			gcl->gmax[0] = gcl->gmax[1] = FHUGE;
82	gwlarson	3.21	return; /* too close (to wall) */
83	gwlarson	3.19	}
84	gwlarson	3.21	ab2 = 1./ab2; /* 1/norm2(ab) */
85			od = DOT(gp, ab); /* origin dot direction */
86			cfact = 1./(1. - ab2gcl->erg2); / tan^2 + 1 of cone angle */
87			for (i = 0; i < 3; i++) { /* compute cone equation */
88			sqcoef[i] = ab[i]ab[i]cfact*ab2 - 1.;
89			ctcoef[i] = 2.ab[i]ab[(i+1)%3]cfactab2;
90			licoef[i] = 2.(gp[i] - ab[i]cfactodab2);
91			}
92			cnst = cfactodod*ab2 - DOT(gp,gp);
93			/*
94			* CONE: sqcoef[0]xx + sqcoef[1]yy + sqcoef[2]zz
95			* + ctcoef[0]xy + ctcoef[1]yz + ctcoef[2]zx
96			* + licoef[0]x + licoef[1]y + licoef[2]*z + cnst == 0
97			*/
98			/* equation for conic section in plane */
99			gi[0] = hdwg0[gcl->gc.w];
100			gi[1] = hdwg1[gcl->gc.w];
101			wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0;
102			a = sqcoef[gi[0]]; /* x2 */
103			b = ctcoef[gi[0]]; /* xy */
104			c = sqcoef[gi[1]]; /* y2 */
105			d = ctcoef[gw]wallpos + licoef[gi[0]]; / x */
106			e = ctcoef[gi[1]]wallpos + licoef[gi[1]]; / y */
107			f = wallpos(wallpossqcoef[gw] + licoef[gw]) + cnst;
108			for (i = 0; i < 2; i++) {
109			if (i) { /* swap x and y coefficients */
110			register double t;
111			t = a; a = c; c = t;
112			t = d; d = e; e = t;
113	gwlarson	3.20	}
114	gwlarson	3.21	nex = 0; /* check global extrema */
115			n = quadratic(root, a(4.ac-bb), 2.a(2.cd-b*e),
116			d(cd-be) + fb*b);
117			while (n-- > 0) {
118			if (gc->w>>1 == gi[i] &&
119	schorsch	3.27	(gc->w&1) ^ (root[n] < gp[gc->w>>1])) {
120	gwlarson	3.21	if (gc->w&1)
121			gcl->gmin[i] = -FHUGE;
122			else
123			gcl->gmax[i] = FHUGE;
124			nex++;
125			continue; /* hyperbolic */
126			}
127			if (tight) {
128			yex = (-2.aroot[n] - d)/b;
129			if (yex < gcl->gc.i[1-i] \|\|
130			yex > gcl->gc.i[1-i]+1)
131			continue; /* outside cell */
132			}
133			if (root[n] < gcl->gmin[i])
134			gcl->gmin[i] = root[n];
135			if (root[n] > gcl->gmax[i])
136			gcl->gmax[i] = root[n];
137			nex++;
138			}
139			/* check local extrema */
140			for (j = nex < 2 ? 2 : 0; j--; ) {
141			yex = gcl->gc.i[1-i] + j;
142			n = quadratic(root, a, byex+d, yex(yex*c+e)+f);
143			while (n-- > 0) {
144			if (gc->w>>1 == gi[i] &&
145	schorsch	3.27	(gc->w&1) ^ (root[n] < gp[gc->w>>1]))
146	gwlarson	3.21	continue;
147			if (root[n] < gcl->gmin[i])
148			gcl->gmin[i] = root[n];
149			if (root[n] > gcl->gmax[i])
150			gcl->gmax[i] = root[n];
151			}
152			}
153	gwlarson	3.19	}
154			}
155
156
157			static int
158	schorsch	3.28	clipeyelim( /* clip eye limits to grid cell */
159			register short rrng[2][2],
160			register struct gclim *gcl
161			)
162	gwlarson	3.19	{
163			int incell = 1;
164			register int i;
165
166			for (i = 0; i < 2; i++) {
167			if (gcl->gmin[i] < gcl->gc.i[i])
168			gcl->gmin[i] = gcl->gc.i[i];
169			if (gcl->gmax[i] > gcl->gc.i[i]+1)
170			gcl->gmax[i] = gcl->gc.i[i]+1;
171	gwlarson	3.20	if (gcl->gmax[i] > gcl->gmin[i]) {
172	gwlarson	3.19	rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) +
173			(1.-FTINY);
174			rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) +
175			(1.-FTINY) - rrng[i][0];
176	gwlarson	3.20	} else
177			rrng[i][0] = rrng[i][1] = 0;
178			incell &= rrng[i][1] > 0;
179	gwlarson	3.19	}
180			return(incell);
181			}
182
183
184	schorsch	3.28	extern void
185			packrays( /* pack ray origins and directions */
186			register float *rod,
187			register PACKET *p
188			)
189	gregl	3.1	{
190	gwlarson	3.21	#if 0
191			double dist2sum = 0.;
192			FVECT vt;
193			#endif
194	gwlarson	3.19	int nretries = p->nr + 2;
195			struct gclim eyelim;
196			short rrng0[2][2], rrng1[2][2];
197			int useyelim;
198	gregl	3.3	GCOORD gc[2];
199	gwlarson	3.19	FVECT ro, rd;
200			double d;
201			register int i;
202	gregl	3.1
203			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
204			error(CONSISTENCY, "bad beam index in packrays");
205	gwlarson	3.19	if ((useyelim = myeye.rng > FTINY)) {
206	gwlarson	3.20	initeyelim(&eyelim, hdlist[p->hd], gc);
207	gwlarson	3.21	groweyelim(&eyelim, gc+1, 0., 0., 0);
208			groweyelim(&eyelim, gc+1, 1., 1., 0);
209			useyelim = clipeyelim(rrng0, &eyelim);
210			#ifdef DEBUG
211			if (!useyelim)
212			error(WARNING, "no eye overlap in packrays");
213			#endif
214	gwlarson	3.19	}
215			for (i = 0; i < p->nr; i++) {
216			retry:
217			if (useyelim) {
218	gwlarson	3.20	initeyelim(&eyelim, NULL, gc+1);
219	gwlarson	3.19	p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1])
220			+ rrng0[0][0];
221			p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1])
222			+ rrng0[1][0];
223	gwlarson	3.20	groweyelim(&eyelim, gc,
224			(1./256.)*(p->ra[i].r[0][0]+.5),
225	gwlarson	3.21	(1./256.)*(p->ra[i].r[0][1]+.5), 1);
226	gwlarson	3.19	if (!clipeyelim(rrng1, &eyelim)) {
227	gwlarson	3.21	useyelim = nretries-- > 0;
228			#ifdef DEBUG
229			if (!useyelim)
230			error(WARNING,
231			"exceeded retry limit in packrays");
232			#endif
233	gwlarson	3.19	goto retry;
234			}
235			p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1])
236			+ rrng1[0][0];
237			p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1])
238			+ rrng1[1][0];
239			} else {
240			p->ra[i].r[0][0] = frandom() * 256.;
241			p->ra[i].r[0][1] = frandom() * 256.;
242			p->ra[i].r[1][0] = frandom() * 256.;
243			p->ra[i].r[1][1] = frandom() * 256.;
244			}
245			d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r);
246	gwlarson	3.21	#if 0
247			VSUM(vt, ro, rd, d);
248			dist2sum += dist2line(myeye.vpt, ro, vt);
249			#endif
250	gregl	3.1	if (p->offset != NULL) {
251	gwlarson	3.16	if (!vdef(OBSTRUCTIONS))
252			d = frandom(); / random offset */
253	gregl	3.8	VSUM(ro, ro, rd, d); /* advance ray */
254	gwlarson	3.19	p->offset[i] = d;
255	gregl	3.1	}
256	gwlarson	3.19	VCOPY(rod, ro);
257			rod += 3;
258			VCOPY(rod, rd);
259			rod += 3;
260	gregl	3.1	}
261	gwlarson	3.21	#if 0
262			fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr),
263			p->nr + 2 - nretries);
264			#endif
265	gregl	3.1	}
266
267
268	schorsch	3.28	extern void
269			donerays( /* encode finished ray computations */
270			register PACKET *p,
271			register float *rvl
272			)
273	gregl	3.1	{
274			double d;
275			register int i;
276
277			for (i = 0; i < p->nr; i++) {
278			setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]);
279			d = rvl[3];
280			if (p->offset != NULL)
281			d += p->offset[i];
282			p->ra[i].d = hdcode(hdlist[p->hd], d);
283			rvl += 4;
284			}
285	gregl	3.4	p->nc += p->nr;
286	gregl	3.5	}
287
288
289	schorsch	3.28	extern int
290			done_rtrace(void) /* clean up and close rtrace calculation */
291	gregl	3.5	{
292			int status;
293			/* already closed? */
294			if (!nprocs)
295	greg	3.25	return(0);
296	gregl	3.5	/* flush beam queue */
297			done_packets(flush_queue());
298	gregl	3.7	/* sync holodeck */
299			hdsync(NULL, 1);
300	gregl	3.5	/* close rtrace */
301			if ((status = end_rtrace()))
302			error(WARNING, "bad exit status from rtrace");
303	gregl	3.9	if (vdef(REPORT)) { /* report time */
304	gregl	3.10	eputs("rtrace process closed\n");
305	gregl	3.5	report(0);
306	gregl	3.9	}
307	gregl	3.5	return(status); /* return status */
308			}
309
310
311	schorsch	3.28	extern void
312			new_rtrace(void) /* restart rtrace calculation */
313	gregl	3.5	{
314			char combuf[128];
315
316			if (nprocs > 0) /* already running? */
317			return;
318	gregl	3.6	starttime = time(NULL); /* reset start time and counts */
319			npacksdone = nraysdone = 0L;
320			if (vdef(TIME)) /* reset end time */
321			endtime = starttime + vflt(TIME)*3600. + .5;
322	gregl	3.5	if (vdef(RIF)) { /* rerun rad to update octree */
323			sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF));
324			if (system(combuf))
325			error(WARNING, "error running rad");
326			}
327			if (start_rtrace() < 1) /* start rtrace */
328			error(WARNING, "cannot restart rtrace");
329	gregl	3.9	else if (vdef(REPORT)) {
330			eputs("rtrace process restarted\n");
331	gregl	3.5	report(0);
332	gregl	3.9	}
333	gregl	3.5	}
334
335
336	schorsch	3.28	extern int
337			getradfile(void) /* run rad and get needed variables */
338	gregl	3.5	{
339	gwlarson	3.12	static short mvar[] = {OCTREE,EYESEP,-1};
340	gregl	3.5	static char tf1[] = TEMPLATE;
341			char tf2[64];
342			char combuf[256];
343	schorsch	3.28	char *pippt = NULL;
344	gregl	3.5	register int i;
345			register char *cp;
346			/* check if rad file specified */
347			if (!vdef(RIF))
348	gregl	3.11	return(0);
349	gregl	3.5	/* create rad command */
350			mktemp(tf1);
351			sprintf(tf2, "%s.rif", tf1);
352			sprintf(combuf,
353			"rad -v 0 -s -e -w %s OPTFILE=%s \| egrep '^[ \t]*(NOMATCH",
354			vval(RIF), tf1);
355			cp = combuf;
356			while (*cp){
357			if (*cp == '\|') pippt = cp;
358			cp++;
359			} /* match unset variables */
360			for (i = 0; mvar[i] >= 0; i++)
361			if (!vdef(mvar[i])) {
362			*cp++ = '\|';
363			strcpy(cp, vnam(mvar[i]));
364			while (*cp) cp++;
365			pippt = NULL;
366			}
367			if (pippt != NULL)
368	schorsch	3.24	strcpy(pippt, "> " NULL_DEVICE); /* nothing to match */
369	gregl	3.5	else
370			sprintf(cp, ")[ \t]*=' > %s", tf2);
371	gwlarson	3.13	#ifdef DEBUG
372			wputs(combuf); wputs("\n");
373			#endif
374			system(combuf); /* ignore exit code */
375	gregl	3.5	if (pippt == NULL) {
376			loadvars(tf2); /* load variables */
377			unlink(tf2);
378			}
379			rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
380			unlink(tf1); /* clean up */
381	gregl	3.11	return(1);
382	gregl	3.6	}
383
384
385	schorsch	3.28	extern void
386			report( /* report progress so far */
387			time_t t
388			)
389	gregl	3.6	{
390			static time_t seconds2go = 1000000;
391
392			if (t == 0L)
393			t = time(NULL);
394			sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
395			npacksdone, nraysdone, (t-starttime)/3600.);
396			eputs(errmsg);
397			if (seconds2go == 1000000)
398			seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
399			if (seconds2go)
400			reporttime = t + seconds2go;
401	gregl	3.1	}