src/rt/rv2.c

/* Copyright (c) 1987 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  rv2.c - command routines used in tracing a view.
 *
 *     3/24/87
 */

#include  "ray.h"

#include  "octree.h"

#include  "otypes.h"

#include  "rpaint.h"

#include  <ctype.h>

#define  CTRL(c)        ('c'-'@')

extern char  *progname;


getframe(s)                             /* get a new frame */
char  *s;
{
        if (getrect(s, &pframe) < 0)
                return;
        pdepth = 0;
}


getrepaint(s)                           /* get area and repaint */
char  *s;
{
        RECT  box;

        if (getrect(s, &box) < 0)
                return;
        paintrect(&ptrunk, 0, 0, hresolu, vresolu, &box);
}


getview(s)                              /* get/show view parameters */
char  *s;
{
        FILE  *fp;
        char  buf[128];
        char  *fname;
        int  change = 0;
        VIEW  nv;

        if (sscanf(s, "%s", buf) == 1) {        /* write parameters to a file */
                if ((fname = getpath(buf, NULL, 0)) == NULL ||
                                (fp = fopen(fname, "a")) == NULL) {
                        sprintf(errmsg, "cannot open \"%s\"", buf);
                        error(COMMAND, errmsg);
                        return;
                }
                fputs(progname, fp);
                fprintview(&ourview, fp);
                fputs(sskip(s), fp);
                fputs("\n", fp);
                fclose(fp);
                return;
        }
        sprintf(buf, "view type (%c): ", ourview.type);
        (*dev->comout)(buf);
        (*dev->comin)(buf, NULL);
        if (buf[0] == CTRL(C)) return;
        if (buf[0] && buf[0] != ourview.type) {
                nv.type = buf[0];
                change++;
        } else
                nv.type = ourview.type;
        sprintf(buf, "view point (%.6g %.6g %.6g): ",
                        ourview.vp[0], ourview.vp[1], ourview.vp[2]);
        (*dev->comout)(buf);
        (*dev->comin)(buf, NULL);
        if (buf[0] == CTRL(C)) return;
        if (sscanf(buf, "%lf %lf %lf", &nv.vp[0], &nv.vp[1], &nv.vp[2]) == 3)
                change++;
        else
                VCOPY(nv.vp, ourview.vp);
        sprintf(buf, "view direction (%.6g %.6g %.6g): ",
                        ourview.vdir[0], ourview.vdir[1], ourview.vdir[2]);
        (*dev->comout)(buf);
        (*dev->comin)(buf, NULL);
        if (buf[0] == CTRL(C)) return;
        if (sscanf(buf,"%lf %lf %lf",&nv.vdir[0],&nv.vdir[1],&nv.vdir[2]) == 3)
                change++;
        else
                VCOPY(nv.vdir, ourview.vdir);
        sprintf(buf, "view up (%.6g %.6g %.6g): ",
                        ourview.vup[0], ourview.vup[1], ourview.vup[2]);
        (*dev->comout)(buf);
        (*dev->comin)(buf, NULL);
        if (buf[0] == CTRL(C)) return;
        if (sscanf(buf,"%lf %lf %lf",&nv.vup[0],&nv.vup[1],&nv.vup[2]) == 3)
                change++;
        else
                VCOPY(nv.vup, ourview.vup);
        sprintf(buf, "view horiz and vert size (%.6g %.6g): ",
                        ourview.horiz, ourview.vert);
        (*dev->comout)(buf);
        (*dev->comin)(buf, NULL);
        if (buf[0] == CTRL(C)) return;
        if (sscanf(buf, "%lf %lf", &nv.horiz, &nv.vert) == 2)
                change++;
        else {
                nv.horiz = ourview.horiz; nv.vert = ourview.vert;
        }
        sprintf(buf, "view shift and lift (%.6g %.6g): ",
                        ourview.hoff, ourview.voff);
        (*dev->comout)(buf);
        (*dev->comin)(buf, NULL);
        if (buf[0] == CTRL(C)) return;
        if (sscanf(buf, "%lf %lf", &nv.hoff, &nv.voff) == 2)
                change++;
        else {
                nv.hoff = ourview.hoff; nv.voff = ourview.voff;
        }
        if (change)
                newview(&nv);
}


lastview(s)                             /* return to a previous view */
char  *s;
{
        char  buf[128];
        char  *fname;
        int  success;
        VIEW  nv;

        if (sscanf(s, "%s", buf) == 1) {        /* get parameters from a file */
                copystruct(&nv, &stdview);
                if ((fname = getpath(buf, NULL, 0)) == NULL ||
                                (success = viewfile(fname, &nv, 0, 0)) == -1) {
                        sprintf(errmsg, "cannot open \"%s\"", buf);
                        error(COMMAND, errmsg);
                        return;
                }
                if (!success)
                        error(COMMAND, "wrong file format");
                else
                        newview(&nv);
                return;
        }
        if (oldview.type == 0) {        /* no old view! */
                error(COMMAND, "no previous view");
                return;
        }
        copystruct(&nv, &ourview);
        copystruct(&ourview, &oldview);
        copystruct(&oldview, &nv);
        newimage();
}


getaim(s)                               /* aim camera */
char  *s;
{
        extern double  tan(), atan();
        double  zfact;
        VIEW  nv;

        if (getinterest(s, 1, nv.vdir, &zfact) < 0)
                return;
        VCOPY(nv.vp, ourview.vp);
        VCOPY(nv.vup, ourview.vup);
        nv.hoff = ourview.hoff; nv.voff = ourview.voff;
        if ((nv.type = ourview.type) == VT_PAR) {
                nv.horiz = ourview.horiz / zfact;
                nv.vert = ourview.vert / zfact;
        } else {
                nv.horiz = atan(tan(ourview.horiz*(PI/180./2.))/zfact) /
                                (PI/180./2.);
                nv.vert = atan(tan(ourview.vert*(PI/180./2.))/zfact) /
                                (PI/180./2.);
        }
        newview(&nv);
}


getmove(s)                              /* move camera */
char  *s;
{
        FVECT  vc;
        double  mag;

        if (getinterest(s, 0, vc, &mag) < 0)
                return;
        moveview(0.0, 0.0, mag, vc);
}


getrotate(s)                            /* rotate camera */
char  *s;
{
        extern double  normalize(), tan(), atan();
        VIEW  nv;
        FVECT  v1;
        double  angle, elev, zfact;
        
        elev = 0.0; zfact = 1.0;
        if (sscanf(s, "%lf %lf %lf", &angle, &elev, &zfact) < 1) {
                error(COMMAND, "missing angle");
                return;
        }
        VCOPY(nv.vp, ourview.vp);
        VCOPY(nv.vup, ourview.vup);
        nv.hoff = ourview.hoff; nv.voff = ourview.voff;
        spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
        if (elev != 0.0) {
                fcross(v1, nv.vdir, ourview.vup);
                normalize(v1);
                spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
        }
        if ((nv.type = ourview.type) == VT_PAR) {
                nv.horiz = ourview.horiz / zfact;
                nv.vert = ourview.vert / zfact;
        } else {
                nv.horiz = atan(tan(ourview.horiz*(PI/180./2.))/zfact) /
                                (PI/180./2.);
                nv.vert = atan(tan(ourview.vert*(PI/180./2.))/zfact) /
                                (PI/180./2.);
        }
        newview(&nv);
}


getpivot(s)                             /* pivot viewpoint */
register char  *s;
{
        FVECT  vc;
        double  angle, elev, mag;

        elev = 0.0;
        if (sscanf(s, "%lf %lf", &angle, &elev) < 1) {
                error(COMMAND, "missing angle");
                return;
        }
        if (getinterest(sskip(sskip(s)), 0, vc, &mag) < 0)
                return;
        moveview(angle, elev, mag, vc);
}


getexposure(s)                          /* get new exposure */
char  *s;
{
        double  atof(), pow(), fabs();
        char  buf[128];
        register char  *cp;
        register PNODE  *p;
        RECT  r;
        int  x, y;
        double  e;

        for (cp = s; isspace(*cp); cp++)
                ;
        if (*cp == '\0') {              /* normalize to point */
                if (dev->getcur == NULL)
                        return;
                (*dev->comout)("Pick point for exposure\n");
                if ((*dev->getcur)(&x, &y) == ABORT)
                        return;
                r.l = r.d = 0;
                r.r = hresolu; r.u = vresolu;
                p = findrect(x, y, &ptrunk, &r, -1);
                e = 1.0;
        } else {
                if (*cp == '=') {       /* absolute setting */
                        p = NULL;
                        e = 1.0/exposure;
                        for (cp++; isspace(*cp); cp++)
                                ;
                        if (*cp == '\0') {      /* interactive */
                                sprintf(buf, "exposure (%lf): ", exposure);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                for (cp = buf; isspace(*cp); cp++)
                                        ;
                                if (*cp == '\0')
                                        return;
                        }
                } else {                /* normalize to average */
                        p = &ptrunk;
                        e = 1.0;
                }
                if (*cp == '+' || *cp == '-')   /* f-stops */
                        e *= pow(2.0, atof(cp));
                else                            /* multiplier */
                        e *= atof(cp);
        }
        if (p != NULL) {                /* relative setting */
                if (bright(p->v) <= FTINY) {
                        error(COMMAND, "cannot normalize to zero");
                        return;
                }
                e *= 0.5 / bright(p->v);
        }
        if (e <= FTINY || fabs(1.0 - e) <= FTINY)
                return;
        scalepict(&ptrunk, e);
        exposure *= e;
        redraw();
}


setparam(s)                             /* get/set program parameter */
register char  *s;
{
        extern int  psample;
        extern double  maxdiff;
        extern double  minweight;
        extern int  maxdepth;
        extern double  dstrsrc;
        extern double  shadthresh;
        extern double  shadcert;
        extern COLOR  ambval;
        extern double  ambacc;
        extern double  minarad;
        extern int  ambres;
        extern int  ambdiv;
        extern int  ambssamp;
        extern int  ambounce;
        int  i0;
        double  d0, d1, d2;
        char  buf[128];
        
        if (s[0] == '\0') {
                (*dev->comout)("aa ab ad ar as av dc dj dt lr lw sp st: ");
                (*dev->comin)(buf, NULL);
                s = buf;
        }
        switch (s[0]) {
        case 'l':                       /* limit */
                switch (s[1]) {
                case 'w':                       /* weight */
                        if (sscanf(s+2, "%lf", &d0) != 1) {
                                sprintf(buf, "limit weight (%.6g): ",
                                                minweight);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf", &d0) != 1)
                                        break;
                        }
                        minweight = d0;
                        break;
                case 'r':                       /* reflection */
                        if (sscanf(s+2, "%d", &i0) != 1) {
                                sprintf(buf, "limit reflection (%d): ",
                                                maxdepth);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%d", &i0) != 1)
                                        break;
                        }
                        maxdepth = i0;
                        break;
                default:
                        goto badparam;
                }
                break;
        case 'd':                       /* direct */
                switch (s[1]) {
                case 'j':                       /* jitter */
                        if (sscanf(s+2, "%lf", &d0) != 1) {
                                sprintf(buf, "direct jitter (%.6g): ",
                                                dstrsrc);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf", &d0) != 1)
                                        break;
                        }
                        dstrsrc = d0;
                        break;
                case 'c':                       /* certainty */
                        if (sscanf(s+2, "%lf", &d0) != 1) {
                                sprintf(buf, "direct certainty (%.6g): ",
                                                shadcert);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf", &d0) != 1)
                                        break;
                        }
                        shadcert = d0;
                        break;
                case 't':                       /* threshold */
                        if (sscanf(s+2, "%lf", &d0) != 1) {
                                sprintf(buf, "direct threshold (%.6g): ",
                                                shadthresh);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf", &d0) != 1)
                                        break;
                        }
                        shadthresh = d0;
                        break;
                default:
                        goto badparam;
                }
                break;
        case 'a':                       /* ambient */
                switch (s[1]) {
                case 'v':                       /* value */
                        if (sscanf(s+2, "%lf %lf %lf", &d0, &d1, &d2) != 3) {
                                sprintf(buf,
                                        "ambient value (%.6g %.6g %.6g): ",
                                                colval(ambval,RED),
                                                colval(ambval,GRN),
                                                colval(ambval,BLU));
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf %lf %lf",
                                                &d0, &d1, &d2) != 3)
                                        break;
                        }
                        setcolor(ambval, d0, d1, d2);
                        break;
                case 'a':                       /* accuracy */
                        if (sscanf(s+2, "%lf", &d0) != 1) {
                                sprintf(buf, "ambient accuracy (%.6g): ",
                                                ambacc);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf", &d0) != 1)
                                        break;
                        }
                        ambacc = d0;
                        break;
                case 'd':                       /* divisions */
                        if (sscanf(s+2, "%d", &i0) != 1) {
                                sprintf(buf, "ambient divisions (%d): ",
                                                ambdiv);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%d", &i0) != 1)
                                        break;
                        }
                        ambdiv = i0;
                        break;
                case 's':                       /* samples */
                        if (sscanf(s+2, "%d", &i0) != 1) {
                                sprintf(buf, "ambient super-samples (%d): ",
                                                ambssamp);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%d", &i0) != 1)
                                        break;
                        }
                        ambssamp = i0;
                        break;
                case 'b':                       /* bounces */
                        if (sscanf(s+2, "%d", &i0) != 1) {
                                sprintf(buf, "ambient bounces (%d): ",
                                                ambounce);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%d", &i0) != 1)
                                        break;
                        }
                        ambounce = i0;
                        break;
                case 'r':
                        if (sscanf(s+2, "%d", &i0) != 1) {
                                sprintf(buf, "ambient resolution (%d): ",
                                                ambres);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%d", &i0) != 1)
                                        break;
                        }
                        ambres = i0;
                        minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
                        break;
                default:
                        goto badparam;
                }
                break;
        case 's':                       /* sample */
                switch (s[1]) {
                case 'p':                       /* pixel */
                        if (sscanf(s+2, "%d", &i0) != 1) {
                                sprintf(buf, "sample pixel (%d): ", psample);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%d", &i0) != 1)
                                        break;
                        }
                        psample = i0;
                        pdepth = 0;
                        break;
                case 't':                       /* threshold */
                        if (sscanf(s+2, "%lf", &d0) != 1) {
                                sprintf(buf, "sample threshold (%.6g): ",
                                                maxdiff);
                                (*dev->comout)(buf);
                                (*dev->comin)(buf, NULL);
                                if (sscanf(buf, "%lf", &d0) != 1)
                                        break;
                        }
                        maxdiff = d0;
                        pdepth = 0;
                        break;
                default:
                        goto badparam;
                }
                break;
        case '\0':                      /* nothing */
                break;
        default:;
badparam:
                sprintf(errmsg, "%s: unknown variable", s);
                error(COMMAND, errmsg);
                break;
        }
}


traceray(s)                             /* trace a single ray */
char  *s;
{
        char  buf[128];
        int  x, y;
        RAY  thisray;

        if (sscanf(s, "%lf %lf %lf %lf %lf %lf",
                &thisray.rorg[0], &thisray.rorg[1], &thisray.rorg[2],
                &thisray.rdir[0], &thisray.rdir[1], &thisray.rdir[2]) != 6) {

                if (dev->getcur == NULL)
                        return;
                (*dev->comout)("Pick ray\n");
                if ((*dev->getcur)(&x, &y) == ABORT)
                        return;

                viewray(thisray.rorg, thisray.rdir, &ourview,
                                (x+.5)/hresolu, (y+.5)/vresolu);
                
        } else if (normalize(thisray.rdir) == 0.0) {
                error(COMMAND, "zero ray direction");
                return;
        }

        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        
        rayvalue(&thisray);

        if (thisray.ro == NULL)
                (*dev->comout)("ray hit nothing");
        else {
                sprintf(buf, "ray hit %s %s \"%s\"",
                                objptr(thisray.ro->omod)->oname,
                                ofun[thisray.ro->otype].funame,
                                thisray.ro->oname);
                (*dev->comout)(buf);
                (*dev->comin)(buf, NULL);
                if (thisray.rot >= FHUGE)
                        (*dev->comout)("at infinity");
                else {
                        sprintf(buf, "at (%.6g %.6g %.6g)", thisray.rop[0],
                                        thisray.rop[1], thisray.rop[2]);
                        (*dev->comout)(buf);
                }
                (*dev->comin)(buf, NULL);
                sprintf(buf, "with value (%.6g %.6g %.6g)",
                                colval(thisray.rcol,RED),
                                colval(thisray.rcol,GRN),
                                colval(thisray.rcol,BLU));
                (*dev->comout)(buf);
        }
        (*dev->comin)(buf, NULL);
}


writepict(s)                            /* write the picture to a file */
char  *s;
{
        static char  buf[128];
        char  *fname;
        FILE  *fp;
        COLR  *scanline;
        int  y;

        if (sscanf(s, "%s", buf) != 1 && buf[0] == '\0') {
                error(COMMAND, "no file");
                return;
        }
        if ((fname = getpath(buf, NULL, 0)) == NULL ||
                        (fp = fopen(fname, "w")) == NULL) {
                sprintf(errmsg, "cannot open \"%s\"", buf);
                error(COMMAND, errmsg);
                return;
        }
        (*dev->comout)("writing \"");
        (*dev->comout)(fname);
        (*dev->comout)("\"...\n");
                                                /* write header */
        fputs(progname, fp);
        fprintview(&ourview, fp);
        putc('\n', fp);
        if (exposure != 1.0)
                fputexpos(exposure, fp);
        if (dev->pixaspect != 1.0)
                fputaspect(dev->pixaspect, fp);
        putc('\n', fp);
        fputresolu(YMAJOR|YDECR, hresolu, vresolu, fp);

        scanline = (COLR *)malloc(hresolu*sizeof(COLR));
        if (scanline == NULL)
                error(SYSTEM, "out of memory in writepict");
        for (y = vresolu-1; y >= 0; y--) {
                getpictcolrs(y, scanline, &ptrunk, hresolu, vresolu);
                if (fwritecolrs(scanline, hresolu, fp) < 0)
                        break;
        }
        if (fclose(fp) < 0)
                error(COMMAND, "write error");
        free((char *)scanline);
}
Revision:	1.20
Committed:	Tue Feb 27 09:50:56 1990 UTC (34 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+1 -1 lines
Log Message:	minor fixes in comments etc.
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1987 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* rv2.c - command routines used in tracing a view.
9			*
10			* 3/24/87
11			*/
12
13			#include "ray.h"
14
15			#include "octree.h"
16
17			#include "otypes.h"
18
19			#include "rpaint.h"
20
21			#include <ctype.h>
22
23			#define CTRL(c) ('c'-'@')
24
25			extern char *progname;
26
27
28			getframe(s) /* get a new frame */
29			char *s;
30			{
31	greg	1.12	if (getrect(s, &pframe) < 0)
32	greg	1.1	return;
33			pdepth = 0;
34			}
35
36
37	greg	1.12	getrepaint(s) /* get area and repaint */
38			char *s;
39			{
40			RECT box;
41
42			if (getrect(s, &box) < 0)
43			return;
44	greg	1.14	paintrect(&ptrunk, 0, 0, hresolu, vresolu, &box);
45	greg	1.12	}
46
47
48	greg	1.1	getview(s) /* get/show view parameters */
49			char *s;
50			{
51			FILE *fp;
52			char buf[128];
53	greg	1.10	char *fname;
54	greg	1.3	int change = 0;
55	greg	1.1	VIEW nv;
56
57			if (sscanf(s, "%s", buf) == 1) { /* write parameters to a file */
58	greg	1.10	if ((fname = getpath(buf, NULL, 0)) == NULL \|\|
59	greg	1.1	(fp = fopen(fname, "a")) == NULL) {
60			sprintf(errmsg, "cannot open \"%s\"", buf);
61			error(COMMAND, errmsg);
62			return;
63			}
64	greg	1.2	fputs(progname, fp);
65	greg	1.1	fprintview(&ourview, fp);
66	greg	1.19	fputs(sskip(s), fp);
67	greg	1.1	fputs("\n", fp);
68			fclose(fp);
69			return;
70			}
71			sprintf(buf, "view type (%c): ", ourview.type);
72			(*dev->comout)(buf);
73	greg	1.18	(*dev->comin)(buf, NULL);
74	greg	1.1	if (buf[0] == CTRL(C)) return;
75	greg	1.3	if (buf[0] && buf[0] != ourview.type) {
76	greg	1.1	nv.type = buf[0];
77	greg	1.3	change++;
78			} else
79	greg	1.1	nv.type = ourview.type;
80			sprintf(buf, "view point (%.6g %.6g %.6g): ",
81			ourview.vp[0], ourview.vp[1], ourview.vp[2]);
82			(*dev->comout)(buf);
83	greg	1.18	(*dev->comin)(buf, NULL);
84	greg	1.1	if (buf[0] == CTRL(C)) return;
85	greg	1.3	if (sscanf(buf, "%lf %lf %lf", &nv.vp[0], &nv.vp[1], &nv.vp[2]) == 3)
86			change++;
87			else
88	greg	1.1	VCOPY(nv.vp, ourview.vp);
89			sprintf(buf, "view direction (%.6g %.6g %.6g): ",
90			ourview.vdir[0], ourview.vdir[1], ourview.vdir[2]);
91			(*dev->comout)(buf);
92	greg	1.18	(*dev->comin)(buf, NULL);
93	greg	1.1	if (buf[0] == CTRL(C)) return;
94	greg	1.3	if (sscanf(buf,"%lf %lf %lf",&nv.vdir[0],&nv.vdir[1],&nv.vdir[2]) == 3)
95			change++;
96			else
97	greg	1.1	VCOPY(nv.vdir, ourview.vdir);
98			sprintf(buf, "view up (%.6g %.6g %.6g): ",
99			ourview.vup[0], ourview.vup[1], ourview.vup[2]);
100			(*dev->comout)(buf);
101	greg	1.18	(*dev->comin)(buf, NULL);
102	greg	1.1	if (buf[0] == CTRL(C)) return;
103	greg	1.3	if (sscanf(buf,"%lf %lf %lf",&nv.vup[0],&nv.vup[1],&nv.vup[2]) == 3)
104			change++;
105			else
106	greg	1.1	VCOPY(nv.vup, ourview.vup);
107			sprintf(buf, "view horiz and vert size (%.6g %.6g): ",
108			ourview.horiz, ourview.vert);
109			(*dev->comout)(buf);
110	greg	1.18	(*dev->comin)(buf, NULL);
111	greg	1.1	if (buf[0] == CTRL(C)) return;
112	greg	1.3	if (sscanf(buf, "%lf %lf", &nv.horiz, &nv.vert) == 2)
113			change++;
114			else {
115	greg	1.1	nv.horiz = ourview.horiz; nv.vert = ourview.vert;
116			}
117	greg	1.14	sprintf(buf, "view shift and lift (%.6g %.6g): ",
118			ourview.hoff, ourview.voff);
119	greg	1.1	(*dev->comout)(buf);
120	greg	1.18	(*dev->comin)(buf, NULL);
121	greg	1.1	if (buf[0] == CTRL(C)) return;
122	greg	1.14	if (sscanf(buf, "%lf %lf", &nv.hoff, &nv.voff) == 2)
123	greg	1.3	change++;
124			else {
125	greg	1.14	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
126	greg	1.1	}
127	greg	1.3	if (change)
128			newview(&nv);
129	greg	1.1	}
130
131
132			lastview(s) /* return to a previous view */
133			char *s;
134			{
135			char buf[128];
136	greg	1.10	char *fname;
137	greg	1.1	int success;
138			VIEW nv;
139
140			if (sscanf(s, "%s", buf) == 1) { /* get parameters from a file */
141	greg	1.17	copystruct(&nv, &stdview);
142	greg	1.10	if ((fname = getpath(buf, NULL, 0)) == NULL \|\|
143	greg	1.16	(success = viewfile(fname, &nv, 0, 0)) == -1) {
144	greg	1.1	sprintf(errmsg, "cannot open \"%s\"", buf);
145			error(COMMAND, errmsg);
146			return;
147			}
148			if (!success)
149			error(COMMAND, "wrong file format");
150			else
151			newview(&nv);
152			return;
153			}
154	greg	1.20	if (oldview.type == 0) { /* no old view! */
155	greg	1.1	error(COMMAND, "no previous view");
156			return;
157			}
158	greg	1.17	copystruct(&nv, &ourview);
159			copystruct(&ourview, &oldview);
160			copystruct(&oldview, &nv);
161	greg	1.1	newimage();
162			}
163
164
165			getaim(s) /* aim camera */
166			char *s;
167			{
168			extern double tan(), atan();
169			double zfact;
170			VIEW nv;
171
172			if (getinterest(s, 1, nv.vdir, &zfact) < 0)
173			return;
174			VCOPY(nv.vp, ourview.vp);
175			VCOPY(nv.vup, ourview.vup);
176	greg	1.14	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
177	greg	1.1	if ((nv.type = ourview.type) == VT_PAR) {
178			nv.horiz = ourview.horiz / zfact;
179			nv.vert = ourview.vert / zfact;
180			} else {
181			nv.horiz = atan(tan(ourview.horiz*(PI/180./2.))/zfact) /
182			(PI/180./2.);
183			nv.vert = atan(tan(ourview.vert*(PI/180./2.))/zfact) /
184			(PI/180./2.);
185			}
186			newview(&nv);
187			}
188
189
190			getmove(s) /* move camera */
191			char *s;
192			{
193			FVECT vc;
194			double mag;
195
196			if (getinterest(s, 0, vc, &mag) < 0)
197			return;
198	greg	1.4	moveview(0.0, 0.0, mag, vc);
199	greg	1.1	}
200
201
202			getrotate(s) /* rotate camera */
203			char *s;
204			{
205	greg	1.4	extern double normalize(), tan(), atan();
206	greg	1.1	VIEW nv;
207			FVECT v1;
208	greg	1.4	double angle, elev, zfact;
209	greg	1.1
210	greg	1.4	elev = 0.0; zfact = 1.0;
211			if (sscanf(s, "%lf %lf %lf", &angle, &elev, &zfact) < 1) {
212	greg	1.1	error(COMMAND, "missing angle");
213			return;
214			}
215			VCOPY(nv.vp, ourview.vp);
216			VCOPY(nv.vup, ourview.vup);
217	greg	1.14	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
218	greg	1.1	spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
219			if (elev != 0.0) {
220			fcross(v1, nv.vdir, ourview.vup);
221			normalize(v1);
222			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
223			}
224	greg	1.4	if ((nv.type = ourview.type) == VT_PAR) {
225			nv.horiz = ourview.horiz / zfact;
226			nv.vert = ourview.vert / zfact;
227			} else {
228			nv.horiz = atan(tan(ourview.horiz*(PI/180./2.))/zfact) /
229			(PI/180./2.);
230			nv.vert = atan(tan(ourview.vert*(PI/180./2.))/zfact) /
231			(PI/180./2.);
232			}
233	greg	1.1	newview(&nv);
234			}
235
236
237			getpivot(s) /* pivot viewpoint */
238			register char *s;
239			{
240			FVECT vc;
241	greg	1.4	double angle, elev, mag;
242	greg	1.1
243	greg	1.4	elev = 0.0;
244			if (sscanf(s, "%lf %lf", &angle, &elev) < 1) {
245	greg	1.1	error(COMMAND, "missing angle");
246			return;
247			}
248	greg	1.4	if (getinterest(sskip(sskip(s)), 0, vc, &mag) < 0)
249	greg	1.1	return;
250	greg	1.4	moveview(angle, elev, mag, vc);
251	greg	1.1	}
252
253
254			getexposure(s) /* get new exposure */
255			char *s;
256			{
257			double atof(), pow(), fabs();
258			char buf[128];
259			register char *cp;
260			register PNODE *p;
261			RECT r;
262			int x, y;
263			double e;
264
265			for (cp = s; isspace(*cp); cp++)
266			;
267			if (cp == '\0') { / normalize to point */
268			if (dev->getcur == NULL)
269			return;
270			(*dev->comout)("Pick point for exposure\n");
271			if ((*dev->getcur)(&x, &y) == ABORT)
272			return;
273			r.l = r.d = 0;
274	greg	1.14	r.r = hresolu; r.u = vresolu;
275	greg	1.1	p = findrect(x, y, &ptrunk, &r, -1);
276			e = 1.0;
277			} else {
278			if (cp == '=') { / absolute setting */
279			p = NULL;
280			e = 1.0/exposure;
281			for (cp++; isspace(*cp); cp++)
282			;
283			if (cp == '\0') { / interactive */
284			sprintf(buf, "exposure (%lf): ", exposure);
285			(*dev->comout)(buf);
286	greg	1.18	(*dev->comin)(buf, NULL);
287	greg	1.1	for (cp = buf; isspace(*cp); cp++)
288			;
289			if (*cp == '\0')
290			return;
291			}
292			} else { /* normalize to average */
293			p = &ptrunk;
294			e = 1.0;
295			}
296			if (cp == '+' \|\| cp == '-') /* f-stops */
297			e *= pow(2.0, atof(cp));
298			else /* multiplier */
299			e *= atof(cp);
300			}
301			if (p != NULL) { /* relative setting */
302	greg	1.6	if (bright(p->v) <= FTINY) {
303	greg	1.1	error(COMMAND, "cannot normalize to zero");
304			return;
305			}
306	greg	1.6	e *= 0.5 / bright(p->v);
307	greg	1.1	}
308			if (e <= FTINY \|\| fabs(1.0 - e) <= FTINY)
309			return;
310			scalepict(&ptrunk, e);
311			exposure *= e;
312			redraw();
313			}
314
315
316			setparam(s) /* get/set program parameter */
317			register char *s;
318			{
319			extern int psample;
320			extern double maxdiff;
321			extern double minweight;
322			extern int maxdepth;
323			extern double dstrsrc;
324	greg	1.5	extern double shadthresh;
325	greg	1.9	extern double shadcert;
326	greg	1.1	extern COLOR ambval;
327			extern double ambacc;
328			extern double minarad;
329			extern int ambres;
330			extern int ambdiv;
331			extern int ambssamp;
332			extern int ambounce;
333			int i0;
334			double d0, d1, d2;
335			char buf[128];
336
337			if (s[0] == '\0') {
338	greg	1.9	(*dev->comout)("aa ab ad ar as av dc dj dt lr lw sp st: ");
339	greg	1.18	(*dev->comin)(buf, NULL);
340	greg	1.1	s = buf;
341			}
342			switch (s[0]) {
343			case 'l': /* limit */
344			switch (s[1]) {
345			case 'w': /* weight */
346			if (sscanf(s+2, "%lf", &d0) != 1) {
347			sprintf(buf, "limit weight (%.6g): ",
348			minweight);
349			(*dev->comout)(buf);
350	greg	1.18	(*dev->comin)(buf, NULL);
351	greg	1.1	if (sscanf(buf, "%lf", &d0) != 1)
352			break;
353			}
354			minweight = d0;
355			break;
356			case 'r': /* reflection */
357			if (sscanf(s+2, "%d", &i0) != 1) {
358			sprintf(buf, "limit reflection (%d): ",
359			maxdepth);
360			(*dev->comout)(buf);
361	greg	1.18	(*dev->comin)(buf, NULL);
362	greg	1.1	if (sscanf(buf, "%d", &i0) != 1)
363			break;
364			}
365			maxdepth = i0;
366			break;
367			default:
368			goto badparam;
369			}
370			break;
371	greg	1.5	case 'd': /* direct */
372			switch (s[1]) {
373			case 'j': /* jitter */
374			if (sscanf(s+2, "%lf", &d0) != 1) {
375			sprintf(buf, "direct jitter (%.6g): ",
376			dstrsrc);
377			(*dev->comout)(buf);
378	greg	1.18	(*dev->comin)(buf, NULL);
379	greg	1.5	if (sscanf(buf, "%lf", &d0) != 1)
380			break;
381			}
382			dstrsrc = d0;
383	greg	1.9	break;
384			case 'c': /* certainty */
385			if (sscanf(s+2, "%lf", &d0) != 1) {
386			sprintf(buf, "direct certainty (%.6g): ",
387			shadcert);
388			(*dev->comout)(buf);
389	greg	1.18	(*dev->comin)(buf, NULL);
390	greg	1.9	if (sscanf(buf, "%lf", &d0) != 1)
391			break;
392			}
393			shadcert = d0;
394	greg	1.5	break;
395	greg	1.8	case 't': /* threshold */
396	greg	1.5	if (sscanf(s+2, "%lf", &d0) != 1) {
397	greg	1.8	sprintf(buf, "direct threshold (%.6g): ",
398	greg	1.5	shadthresh);
399			(*dev->comout)(buf);
400	greg	1.18	(*dev->comin)(buf, NULL);
401	greg	1.5	if (sscanf(buf, "%lf", &d0) != 1)
402			break;
403			}
404			shadthresh = d0;
405			break;
406			default:
407	greg	1.1	goto badparam;
408			}
409			break;
410			case 'a': /* ambient */
411			switch (s[1]) {
412			case 'v': /* value */
413			if (sscanf(s+2, "%lf %lf %lf", &d0, &d1, &d2) != 3) {
414			sprintf(buf,
415			"ambient value (%.6g %.6g %.6g): ",
416			colval(ambval,RED),
417			colval(ambval,GRN),
418			colval(ambval,BLU));
419			(*dev->comout)(buf);
420	greg	1.18	(*dev->comin)(buf, NULL);
421	greg	1.1	if (sscanf(buf, "%lf %lf %lf",
422			&d0, &d1, &d2) != 3)
423			break;
424			}
425			setcolor(ambval, d0, d1, d2);
426			break;
427			case 'a': /* accuracy */
428			if (sscanf(s+2, "%lf", &d0) != 1) {
429			sprintf(buf, "ambient accuracy (%.6g): ",
430			ambacc);
431			(*dev->comout)(buf);
432	greg	1.18	(*dev->comin)(buf, NULL);
433	greg	1.1	if (sscanf(buf, "%lf", &d0) != 1)
434			break;
435			}
436			ambacc = d0;
437			break;
438			case 'd': /* divisions */
439			if (sscanf(s+2, "%d", &i0) != 1) {
440			sprintf(buf, "ambient divisions (%d): ",
441			ambdiv);
442			(*dev->comout)(buf);
443	greg	1.18	(*dev->comin)(buf, NULL);
444	greg	1.1	if (sscanf(buf, "%d", &i0) != 1)
445			break;
446			}
447			ambdiv = i0;
448			break;
449			case 's': /* samples */
450			if (sscanf(s+2, "%d", &i0) != 1) {
451			sprintf(buf, "ambient super-samples (%d): ",
452			ambssamp);
453			(*dev->comout)(buf);
454	greg	1.18	(*dev->comin)(buf, NULL);
455	greg	1.1	if (sscanf(buf, "%d", &i0) != 1)
456			break;
457			}
458			ambssamp = i0;
459			break;
460			case 'b': /* bounces */
461			if (sscanf(s+2, "%d", &i0) != 1) {
462			sprintf(buf, "ambient bounces (%d): ",
463			ambounce);
464			(*dev->comout)(buf);
465	greg	1.18	(*dev->comin)(buf, NULL);
466	greg	1.1	if (sscanf(buf, "%d", &i0) != 1)
467			break;
468			}
469			ambounce = i0;
470			break;
471			case 'r':
472			if (sscanf(s+2, "%d", &i0) != 1) {
473			sprintf(buf, "ambient resolution (%d): ",
474			ambres);
475			(*dev->comout)(buf);
476	greg	1.18	(*dev->comin)(buf, NULL);
477	greg	1.1	if (sscanf(buf, "%d", &i0) != 1)
478			break;
479			}
480			ambres = i0;
481			minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
482			break;
483			default:
484			goto badparam;
485			}
486			break;
487			case 's': /* sample */
488			switch (s[1]) {
489			case 'p': /* pixel */
490			if (sscanf(s+2, "%d", &i0) != 1) {
491			sprintf(buf, "sample pixel (%d): ", psample);
492			(*dev->comout)(buf);
493	greg	1.18	(*dev->comin)(buf, NULL);
494	greg	1.1	if (sscanf(buf, "%d", &i0) != 1)
495			break;
496			}
497			psample = i0;
498			pdepth = 0;
499			break;
500	greg	1.8	case 't': /* threshold */
501	greg	1.1	if (sscanf(s+2, "%lf", &d0) != 1) {
502	greg	1.8	sprintf(buf, "sample threshold (%.6g): ",
503	greg	1.1	maxdiff);
504			(*dev->comout)(buf);
505	greg	1.18	(*dev->comin)(buf, NULL);
506	greg	1.1	if (sscanf(buf, "%lf", &d0) != 1)
507			break;
508			}
509			maxdiff = d0;
510			pdepth = 0;
511			break;
512			default:
513			goto badparam;
514			}
515			break;
516			case '\0': /* nothing */
517			break;
518			default:;
519			badparam:
520			sprintf(errmsg, "%s: unknown variable", s);
521			error(COMMAND, errmsg);
522			break;
523			}
524			}
525
526
527			traceray(s) /* trace a single ray */
528			char *s;
529			{
530			char buf[128];
531			int x, y;
532			RAY thisray;
533
534			if (sscanf(s, "%lf %lf %lf %lf %lf %lf",
535			&thisray.rorg[0], &thisray.rorg[1], &thisray.rorg[2],
536			&thisray.rdir[0], &thisray.rdir[1], &thisray.rdir[2]) != 6) {
537
538			if (dev->getcur == NULL)
539			return;
540			(*dev->comout)("Pick ray\n");
541			if ((*dev->getcur)(&x, &y) == ABORT)
542			return;
543
544	greg	1.14	viewray(thisray.rorg, thisray.rdir, &ourview,
545			(x+.5)/hresolu, (y+.5)/vresolu);
546	greg	1.1
547			} else if (normalize(thisray.rdir) == 0.0) {
548			error(COMMAND, "zero ray direction");
549			return;
550			}
551
552			rayorigin(&thisray, NULL, PRIMARY, 1.0);
553
554			rayvalue(&thisray);
555
556			if (thisray.ro == NULL)
557			(*dev->comout)("ray hit nothing");
558			else {
559			sprintf(buf, "ray hit %s %s \"%s\"",
560			objptr(thisray.ro->omod)->oname,
561			ofun[thisray.ro->otype].funame,
562			thisray.ro->oname);
563			(*dev->comout)(buf);
564	greg	1.18	(*dev->comin)(buf, NULL);
565	greg	1.1	if (thisray.rot >= FHUGE)
566			(*dev->comout)("at infinity");
567			else {
568			sprintf(buf, "at (%.6g %.6g %.6g)", thisray.rop[0],
569			thisray.rop[1], thisray.rop[2]);
570			(*dev->comout)(buf);
571			}
572	greg	1.18	(*dev->comin)(buf, NULL);
573	greg	1.1	sprintf(buf, "with value (%.6g %.6g %.6g)",
574			colval(thisray.rcol,RED),
575			colval(thisray.rcol,GRN),
576			colval(thisray.rcol,BLU));
577			(*dev->comout)(buf);
578			}
579	greg	1.18	(*dev->comin)(buf, NULL);
580	greg	1.1	}
581
582
583			writepict(s) /* write the picture to a file */
584			char *s;
585			{
586			static char buf[128];
587	greg	1.10	char *fname;
588	greg	1.1	FILE *fp;
589			COLR *scanline;
590			int y;
591
592			if (sscanf(s, "%s", buf) != 1 && buf[0] == '\0') {
593			error(COMMAND, "no file");
594			return;
595			}
596	greg	1.10	if ((fname = getpath(buf, NULL, 0)) == NULL \|\|
597	greg	1.1	(fp = fopen(fname, "w")) == NULL) {
598			sprintf(errmsg, "cannot open \"%s\"", buf);
599			error(COMMAND, errmsg);
600			return;
601			}
602			(*dev->comout)("writing \"");
603			(*dev->comout)(fname);
604			(*dev->comout)("\"...\n");
605			/* write header */
606			fputs(progname, fp);
607			fprintview(&ourview, fp);
608	greg	1.11	putc('\n', fp);
609	greg	1.1	if (exposure != 1.0)
610	greg	1.13	fputexpos(exposure, fp);
611	greg	1.15	if (dev->pixaspect != 1.0)
612			fputaspect(dev->pixaspect, fp);
613	greg	1.11	putc('\n', fp);
614	greg	1.14	fputresolu(YMAJOR\|YDECR, hresolu, vresolu, fp);
615	greg	1.1
616	greg	1.14	scanline = (COLR )malloc(hresolusizeof(COLR));
617	greg	1.1	if (scanline == NULL)
618			error(SYSTEM, "out of memory in writepict");
619	greg	1.14	for (y = vresolu-1; y >= 0; y--) {
620			getpictcolrs(y, scanline, &ptrunk, hresolu, vresolu);
621			if (fwritecolrs(scanline, hresolu, fp) < 0)
622	greg	1.1	break;
623			}
624			if (fclose(fp) < 0)
625			error(COMMAND, "write error");
626			free((char *)scanline);
627			}