src/rt/rv2.c

/* Copyright (c) 1992 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  "resolu.h"

#include  <ctype.h>

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

#ifdef  SMLFLT
#define  sscanvec(s,v)  (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
#else
#define  sscanvec(s,v)  (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
#endif


extern char  VersionID[];
extern char  *progname;
extern char  *octname;


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;

        while (isspace(*s))
                s++;
        if (*s == '-') {                        /* command line parameters */
                copystruct(&nv, &ourview);
                if (sscanview(&nv, s))
                        newview(&nv);
                else
                        error(COMMAND, "bad view option(s)");
                return;
        }
        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 (sscanvec(buf, nv.vp))
                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 (sscanvec(buf, nv.vdir))
                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 (sscanvec(buf, nv.vup))
                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, NULL)) == -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;
        nv.type = ourview.type;
        VCOPY(nv.vp, ourview.vp);
        VCOPY(nv.vup, ourview.vup);
        nv.hoff = ourview.hoff; nv.voff = ourview.voff;
        nv.horiz = ourview.horiz; nv.vert = ourview.vert;
        zoomview(&nv, zfact);
        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;
        }
        nv.type = ourview.type;
        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.));
        }
        nv.horiz = ourview.horiz; nv.vert = ourview.vert;
        zoomview(&nv, zfact);
        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;
{
        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) < 1e-25) {
                        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();
}


getparam(str, dsc, typ, ptr)            /* get variable from user */
char  *str, *dsc;
int  typ;
register union {int i; double d; COLOR C;}  *ptr;
{
        extern char  *index();
        int  i0;
        double  d0, d1, d2;
        char  buf[48];

        switch (typ) {
        case 'i':                       /* integer */
                if (sscanf(str, "%d", &i0) != 1) {
                        (*dev->comout)(dsc);
                        sprintf(buf, " (%d): ", ptr->i);
                        (*dev->comout)(buf);
                        (*dev->comin)(buf, NULL);
                        if (sscanf(buf, "%d", &i0) != 1)
                                return(0);
                }
                ptr->i = i0;
                return(1);
        case 'r':                       /* real */
                if (sscanf(str, "%lf", &d0) != 1) {
                        (*dev->comout)(dsc);
                        sprintf(buf, " (%.6g): ", ptr->d);
                        (*dev->comout)(buf);
                        (*dev->comin)(buf, NULL);
                        if (sscanf(buf, "%lf", &d0) != 1)
                                return(0);
                }
                ptr->d = d0;
                return(1);
        case 'b':                       /* boolean */
                if (sscanf(str, "%1s", buf) != 1) {
                        (*dev->comout)(dsc);
                        sprintf(buf, "? (%c): ", ptr->i ? 'y' : 'n');
                        (*dev->comout)(buf);
                        (*dev->comin)(buf, NULL);
                        if (buf[0] == '\0' ||
                                        index("yY+1tTnN-0fF", buf[0]) == NULL)
                                return(0);
                }
                ptr->i = index("yY+1tT", buf[0]) != NULL;
                return(1);
        case 'C':                       /* color */
                if (sscanf(str, "%lf %lf %lf", &d0, &d1, &d2) != 3) {
                        (*dev->comout)(dsc);
                        sprintf(buf, " (%.6g %.6g %.6g): ",
                                        colval(ptr->C,RED),
                                        colval(ptr->C,GRN),
                                        colval(ptr->C,BLU));
                        (*dev->comout)(buf);
                        (*dev->comin)(buf, NULL);
                        if (sscanf(buf, "%lf %lf %lf", &d0, &d1, &d2) != 3)
                                return(0);
                }
                setcolor(ptr->C, d0, d1, d2);
                return(1);
        }
}


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 int  ambres;
        extern int  ambdiv;
        extern int  ambssamp;
        extern int  ambounce;
        extern int  directinvis;
        extern double  srcsizerat;
        extern int  do_irrad;
        extern double  specjitter;
        extern double  specthresh;
        char  buf[128];
        
        if (s[0] == '\0') {
                (*dev->comout)(
                "aa ab ad ar as av b dc di dj ds dt i lr lw ps pt sj st: ");
                (*dev->comin)(buf, NULL);
                s = buf;
        }
        switch (s[0]) {
        case 'l':                       /* limit */
                switch (s[1]) {
                case 'w':                       /* weight */
                        getparam(s+2, "limit weight", 'r', &minweight);
                        break;
                case 'r':                       /* reflection */
                        getparam(s+2, "limit reflection", 'i', &maxdepth);
                        break;
                default:
                        goto badparam;
                }
                break;
        case 'd':                       /* direct */
                switch (s[1]) {
                case 'j':                       /* jitter */
                        getparam(s+2, "direct jitter", 'r', &dstrsrc);
                        break;
                case 'c':                       /* certainty */
                        getparam(s+2, "direct certainty", 'r', &shadcert);
                        break;
                case 't':                       /* threshold */
                        getparam(s+2, "direct threshold", 'r', &shadthresh);
                        break;
                case 'i':                       /* invisibility */
                        getparam(s+2, "direct invisibility",
                                        'b', &directinvis);
                        break;
                case 's':                       /* sampling */
                        getparam(s+2, "direct sampling", 'r', &srcsizerat);
                        break;
                default:
                        goto badparam;
                }
                break;
        case 'b':                       /* black and white */
                getparam(s+1, "black and white", 'b', &greyscale);
                break;
        case 'i':                       /* irradiance */
                getparam(s+1, "irradiance", 'b', &do_irrad);
                break;
        case 'a':                       /* ambient */
                switch (s[1]) {
                case 'v':                       /* value */
                        getparam(s+2, "ambient value", 'C', ambval);
                        break;
                case 'a':                       /* accuracy */
                        getparam(s+2, "ambient accuracy", 'r', &ambacc);
                        break;
                case 'd':                       /* divisions */
                        getparam(s+2, "ambient divisions", 'i', &ambdiv);
                        break;
                case 's':                       /* samples */
                        getparam(s+2, "ambient super-samples", 'i', &ambssamp);
                        break;
                case 'b':                       /* bounces */
                        getparam(s+2, "ambient bounces", 'i', &ambounce);
                        break;
                case 'r':
                        if (getparam(s+2, "ambient resolution", 'i', &ambres))
                                setambres(ambres);
                        break;
                default:
                        goto badparam;
                }
                break;
        case 'p':                       /* pixel */
                switch (s[1]) {
                case 's':                       /* sample */
                        if (getparam(s+2, "pixel sample", 'i', &psample))
                                pdepth = 0;
                        break;
                case 't':                       /* threshold */
                        if (getparam(s+2, "pixel threshold", 'r', &maxdiff))
                                pdepth = 0;
                        break;
                default:
                        goto badparam;
                }
                break;
        case 's':                       /* specular */
                switch (s[1]) {
                case 'j':                       /* jitter */
                        getparam(s+2, "specular jitter", 'r', &specjitter);
                        break;
                case 't':                       /* threshold */
                        getparam(s+2, "specular threshold", 'r', &specthresh);
                        break;
                default:
                        goto badparam;
                }
                break;
        case '\0':                      /* nothing */
                break;
        default:;
badparam:
                *sskip(s) = '\0';
                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 (!sscanvec(s, thisray.rorg) ||
                        !sscanvec(sskip(sskip(sskip(s))), thisray.rdir)) {

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

                if (viewray(thisray.rorg, thisray.rdir, &ourview,
                                (x+.5)/hresolu, (y+.5)/vresolu) < 0) {
                        error(COMMAND, "not on image");
                        return;
                }

        } 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, "value (%.5g %.5g %.5g) (%.1fL)",
                                colval(thisray.rcol,RED),
                                colval(thisray.rcol,GRN),
                                colval(thisray.rcol,BLU),
                                luminance(thisray.rcol));
                (*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);
        if (octname != NULL)
                fprintf(fp, " %s\n", octname);
        else
                putc('\n', fp);
        fprintf(fp, "SOFTWARE= %s\n", VersionID);
        if (exposure != 1.0)
                fputexpos(exposure, fp);
        if (dev->pixaspect != 1.0)
                fputaspect(dev->pixaspect, fp);
        fputformat(COLRFMT, fp);
        putc('\n', fp);
        fprtresolu(hresolu, vresolu, fp);

        scanline = (COLR *)malloc(hresolu*sizeof(COLR));
        if (scanline == NULL) {
                error(COMMAND, "not enough memory!");
                fclose(fp);
                unlink(fname);
                return;
        }
        for (y = vresolu-1; y >= 0; y--) {
                getpictcolrs(y, scanline, &ptrunk, hresolu, vresolu);
                if (fwritecolrs(scanline, hresolu, fp) < 0)
                        break;
        }
        free((char *)scanline);
        if (fclose(fp) < 0)
                error(COMMAND, "write error");
}
Revision:	2.9
Committed:	Mon Apr 6 18:04:19 1992 UTC (32 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+11 -1 lines
Log Message:	changed view command to accept options
#	User	Rev	Content
1	greg	2.9	/* Copyright (c) 1992 Regents of the University of California */
2	greg	1.1
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	greg	1.33	#include "resolu.h"
22
23	greg	1.1	#include <ctype.h>
24
25	greg	2.4	#define CTRL(c) ((c)-'@')
26	greg	1.1
27	greg	2.6	#ifdef SMLFLT
28			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
29			#else
30			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
31			#endif
32
33
34	greg	1.29	extern char VersionID[];
35	greg	1.1	extern char *progname;
36	greg	1.29	extern char *octname;
37	greg	1.1
38
39			getframe(s) /* get a new frame */
40			char *s;
41			{
42	greg	1.12	if (getrect(s, &pframe) < 0)
43	greg	1.1	return;
44			pdepth = 0;
45			}
46
47
48	greg	1.12	getrepaint(s) /* get area and repaint */
49			char *s;
50			{
51			RECT box;
52
53			if (getrect(s, &box) < 0)
54			return;
55	greg	1.14	paintrect(&ptrunk, 0, 0, hresolu, vresolu, &box);
56	greg	1.12	}
57
58
59	greg	1.1	getview(s) /* get/show view parameters */
60			char *s;
61			{
62			FILE *fp;
63			char buf[128];
64	greg	1.10	char *fname;
65	greg	1.3	int change = 0;
66	greg	1.1	VIEW nv;
67
68	greg	2.9	while (isspace(*s))
69			s++;
70			if (s == '-') { / command line parameters */
71			copystruct(&nv, &ourview);
72			if (sscanview(&nv, s))
73			newview(&nv);
74			else
75			error(COMMAND, "bad view option(s)");
76			return;
77			}
78	greg	1.1	if (sscanf(s, "%s", buf) == 1) { /* write parameters to a file */
79	greg	1.10	if ((fname = getpath(buf, NULL, 0)) == NULL \|\|
80	greg	1.1	(fp = fopen(fname, "a")) == NULL) {
81			sprintf(errmsg, "cannot open \"%s\"", buf);
82			error(COMMAND, errmsg);
83			return;
84			}
85	greg	1.2	fputs(progname, fp);
86	greg	1.1	fprintview(&ourview, fp);
87	greg	1.19	fputs(sskip(s), fp);
88	greg	1.1	fputs("\n", fp);
89			fclose(fp);
90			return;
91			}
92			sprintf(buf, "view type (%c): ", ourview.type);
93			(*dev->comout)(buf);
94	greg	1.18	(*dev->comin)(buf, NULL);
95	greg	2.4	if (buf[0] == CTRL('C')) return;
96	greg	1.3	if (buf[0] && buf[0] != ourview.type) {
97	greg	1.1	nv.type = buf[0];
98	greg	1.3	change++;
99			} else
100	greg	1.1	nv.type = ourview.type;
101			sprintf(buf, "view point (%.6g %.6g %.6g): ",
102			ourview.vp[0], ourview.vp[1], ourview.vp[2]);
103			(*dev->comout)(buf);
104	greg	1.18	(*dev->comin)(buf, NULL);
105	greg	2.4	if (buf[0] == CTRL('C')) return;
106	greg	2.6	if (sscanvec(buf, nv.vp))
107	greg	1.3	change++;
108			else
109	greg	1.1	VCOPY(nv.vp, ourview.vp);
110			sprintf(buf, "view direction (%.6g %.6g %.6g): ",
111			ourview.vdir[0], ourview.vdir[1], ourview.vdir[2]);
112			(*dev->comout)(buf);
113	greg	1.18	(*dev->comin)(buf, NULL);
114	greg	2.4	if (buf[0] == CTRL('C')) return;
115	greg	2.6	if (sscanvec(buf, nv.vdir))
116	greg	1.3	change++;
117			else
118	greg	1.1	VCOPY(nv.vdir, ourview.vdir);
119			sprintf(buf, "view up (%.6g %.6g %.6g): ",
120			ourview.vup[0], ourview.vup[1], ourview.vup[2]);
121			(*dev->comout)(buf);
122	greg	1.18	(*dev->comin)(buf, NULL);
123	greg	2.4	if (buf[0] == CTRL('C')) return;
124	greg	2.6	if (sscanvec(buf, nv.vup))
125	greg	1.3	change++;
126			else
127	greg	1.1	VCOPY(nv.vup, ourview.vup);
128			sprintf(buf, "view horiz and vert size (%.6g %.6g): ",
129			ourview.horiz, ourview.vert);
130			(*dev->comout)(buf);
131	greg	1.18	(*dev->comin)(buf, NULL);
132	greg	2.4	if (buf[0] == CTRL('C')) return;
133	greg	1.3	if (sscanf(buf, "%lf %lf", &nv.horiz, &nv.vert) == 2)
134			change++;
135			else {
136	greg	1.1	nv.horiz = ourview.horiz; nv.vert = ourview.vert;
137			}
138	greg	1.14	sprintf(buf, "view shift and lift (%.6g %.6g): ",
139			ourview.hoff, ourview.voff);
140	greg	1.1	(*dev->comout)(buf);
141	greg	1.18	(*dev->comin)(buf, NULL);
142	greg	2.4	if (buf[0] == CTRL('C')) return;
143	greg	1.14	if (sscanf(buf, "%lf %lf", &nv.hoff, &nv.voff) == 2)
144	greg	1.3	change++;
145			else {
146	greg	1.14	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
147	greg	1.1	}
148	greg	1.3	if (change)
149			newview(&nv);
150	greg	1.1	}
151
152
153			lastview(s) /* return to a previous view */
154			char *s;
155			{
156			char buf[128];
157	greg	1.10	char *fname;
158	greg	1.1	int success;
159			VIEW nv;
160
161			if (sscanf(s, "%s", buf) == 1) { /* get parameters from a file */
162	greg	1.17	copystruct(&nv, &stdview);
163	greg	1.10	if ((fname = getpath(buf, NULL, 0)) == NULL \|\|
164	greg	1.33	(success = viewfile(fname, &nv, NULL)) == -1) {
165	greg	1.1	sprintf(errmsg, "cannot open \"%s\"", buf);
166			error(COMMAND, errmsg);
167			return;
168			}
169			if (!success)
170			error(COMMAND, "wrong file format");
171			else
172			newview(&nv);
173			return;
174			}
175	greg	1.20	if (oldview.type == 0) { /* no old view! */
176	greg	1.1	error(COMMAND, "no previous view");
177			return;
178			}
179	greg	1.17	copystruct(&nv, &ourview);
180			copystruct(&ourview, &oldview);
181			copystruct(&oldview, &nv);
182	greg	1.1	newimage();
183			}
184
185
186			getaim(s) /* aim camera */
187			char *s;
188			{
189			extern double tan(), atan();
190			double zfact;
191			VIEW nv;
192
193			if (getinterest(s, 1, nv.vdir, &zfact) < 0)
194			return;
195	greg	1.21	nv.type = ourview.type;
196	greg	1.1	VCOPY(nv.vp, ourview.vp);
197			VCOPY(nv.vup, ourview.vup);
198	greg	1.14	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
199	greg	1.21	nv.horiz = ourview.horiz; nv.vert = ourview.vert;
200			zoomview(&nv, zfact);
201	greg	1.1	newview(&nv);
202			}
203
204
205			getmove(s) /* move camera */
206			char *s;
207			{
208			FVECT vc;
209			double mag;
210
211			if (getinterest(s, 0, vc, &mag) < 0)
212			return;
213	greg	1.4	moveview(0.0, 0.0, mag, vc);
214	greg	1.1	}
215
216
217			getrotate(s) /* rotate camera */
218			char *s;
219			{
220	greg	1.4	extern double normalize(), tan(), atan();
221	greg	1.1	VIEW nv;
222			FVECT v1;
223	greg	1.4	double angle, elev, zfact;
224	greg	1.1
225	greg	1.4	elev = 0.0; zfact = 1.0;
226			if (sscanf(s, "%lf %lf %lf", &angle, &elev, &zfact) < 1) {
227	greg	1.1	error(COMMAND, "missing angle");
228			return;
229			}
230	greg	1.21	nv.type = ourview.type;
231	greg	1.1	VCOPY(nv.vp, ourview.vp);
232			VCOPY(nv.vup, ourview.vup);
233	greg	1.14	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
234	greg	1.1	spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
235			if (elev != 0.0) {
236			fcross(v1, nv.vdir, ourview.vup);
237			normalize(v1);
238			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
239			}
240	greg	1.21	nv.horiz = ourview.horiz; nv.vert = ourview.vert;
241			zoomview(&nv, zfact);
242	greg	1.1	newview(&nv);
243			}
244
245
246			getpivot(s) /* pivot viewpoint */
247			register char *s;
248			{
249			FVECT vc;
250	greg	1.4	double angle, elev, mag;
251	greg	1.1
252	greg	1.4	elev = 0.0;
253			if (sscanf(s, "%lf %lf", &angle, &elev) < 1) {
254	greg	1.1	error(COMMAND, "missing angle");
255			return;
256			}
257	greg	1.4	if (getinterest(sskip(sskip(s)), 0, vc, &mag) < 0)
258	greg	1.1	return;
259	greg	1.4	moveview(angle, elev, mag, vc);
260	greg	1.1	}
261
262
263			getexposure(s) /* get new exposure */
264			char *s;
265			{
266			char buf[128];
267			register char *cp;
268			register PNODE *p;
269			RECT r;
270			int x, y;
271			double e;
272
273			for (cp = s; isspace(*cp); cp++)
274			;
275			if (cp == '\0') { / normalize to point */
276			if (dev->getcur == NULL)
277			return;
278			(*dev->comout)("Pick point for exposure\n");
279			if ((*dev->getcur)(&x, &y) == ABORT)
280			return;
281			r.l = r.d = 0;
282	greg	1.14	r.r = hresolu; r.u = vresolu;
283	greg	1.1	p = findrect(x, y, &ptrunk, &r, -1);
284			e = 1.0;
285			} else {
286			if (cp == '=') { / absolute setting */
287			p = NULL;
288			e = 1.0/exposure;
289			for (cp++; isspace(*cp); cp++)
290			;
291			if (cp == '\0') { / interactive */
292			sprintf(buf, "exposure (%lf): ", exposure);
293			(*dev->comout)(buf);
294	greg	1.18	(*dev->comin)(buf, NULL);
295	greg	1.1	for (cp = buf; isspace(*cp); cp++)
296			;
297			if (*cp == '\0')
298			return;
299			}
300			} else { /* normalize to average */
301			p = &ptrunk;
302			e = 1.0;
303			}
304			if (cp == '+' \|\| cp == '-') /* f-stops */
305			e *= pow(2.0, atof(cp));
306			else /* multiplier */
307			e *= atof(cp);
308			}
309			if (p != NULL) { /* relative setting */
310	greg	2.7	if (bright(p->v) < 1e-25) {
311	greg	1.1	error(COMMAND, "cannot normalize to zero");
312			return;
313			}
314	greg	1.6	e *= 0.5 / bright(p->v);
315	greg	1.1	}
316			if (e <= FTINY \|\| fabs(1.0 - e) <= FTINY)
317			return;
318			scalepict(&ptrunk, e);
319			exposure *= e;
320			redraw();
321			}
322
323
324	greg	1.24	getparam(str, dsc, typ, ptr) /* get variable from user */
325			char str, dsc;
326			int typ;
327			register union {int i; double d; COLOR C;} *ptr;
328			{
329	greg	1.25	extern char *index();
330	greg	1.24	int i0;
331			double d0, d1, d2;
332			char buf[48];
333
334			switch (typ) {
335			case 'i': /* integer */
336			if (sscanf(str, "%d", &i0) != 1) {
337			(*dev->comout)(dsc);
338			sprintf(buf, " (%d): ", ptr->i);
339			(*dev->comout)(buf);
340			(*dev->comin)(buf, NULL);
341			if (sscanf(buf, "%d", &i0) != 1)
342	greg	1.31	return(0);
343	greg	1.24	}
344			ptr->i = i0;
345	greg	1.31	return(1);
346	greg	1.24	case 'r': /* real */
347			if (sscanf(str, "%lf", &d0) != 1) {
348			(*dev->comout)(dsc);
349			sprintf(buf, " (%.6g): ", ptr->d);
350			(*dev->comout)(buf);
351			(*dev->comin)(buf, NULL);
352			if (sscanf(buf, "%lf", &d0) != 1)
353	greg	1.31	return(0);
354	greg	1.24	}
355			ptr->d = d0;
356	greg	1.31	return(1);
357	greg	1.24	case 'b': /* boolean */
358			if (sscanf(str, "%1s", buf) != 1) {
359			(*dev->comout)(dsc);
360	greg	2.2	sprintf(buf, "? (%c): ", ptr->i ? 'y' : 'n');
361	greg	1.24	(*dev->comout)(buf);
362			(*dev->comin)(buf, NULL);
363	greg	1.25	if (buf[0] == '\0' \|\|
364			index("yY+1tTnN-0fF", buf[0]) == NULL)
365	greg	1.31	return(0);
366	greg	1.24	}
367	greg	1.25	ptr->i = index("yY+1tT", buf[0]) != NULL;
368	greg	1.31	return(1);
369	greg	1.24	case 'C': /* color */
370			if (sscanf(str, "%lf %lf %lf", &d0, &d1, &d2) != 3) {
371			(*dev->comout)(dsc);
372			sprintf(buf, " (%.6g %.6g %.6g): ",
373			colval(ptr->C,RED),
374			colval(ptr->C,GRN),
375			colval(ptr->C,BLU));
376			(*dev->comout)(buf);
377			(*dev->comin)(buf, NULL);
378			if (sscanf(buf, "%lf %lf %lf", &d0, &d1, &d2) != 3)
379	greg	1.31	return(0);
380	greg	1.24	}
381			setcolor(ptr->C, d0, d1, d2);
382	greg	1.31	return(1);
383	greg	1.24	}
384			}
385
386
387	greg	1.1	setparam(s) /* get/set program parameter */
388			register char *s;
389			{
390			extern int psample;
391			extern double maxdiff;
392			extern double minweight;
393			extern int maxdepth;
394			extern double dstrsrc;
395	greg	1.5	extern double shadthresh;
396	greg	1.9	extern double shadcert;
397	greg	1.1	extern COLOR ambval;
398			extern double ambacc;
399			extern int ambres;
400			extern int ambdiv;
401			extern int ambssamp;
402			extern int ambounce;
403	greg	1.23	extern int directinvis;
404	greg	1.30	extern double srcsizerat;
405	greg	1.23	extern int do_irrad;
406	greg	2.5	extern double specjitter;
407			extern double specthresh;
408	greg	1.24	char buf[128];
409	greg	1.1
410			if (s[0] == '\0') {
411	greg	1.23	(*dev->comout)(
412	greg	2.5	"aa ab ad ar as av b dc di dj ds dt i lr lw ps pt sj st: ");
413	greg	1.18	(*dev->comin)(buf, NULL);
414	greg	1.1	s = buf;
415			}
416			switch (s[0]) {
417			case 'l': /* limit */
418			switch (s[1]) {
419			case 'w': /* weight */
420	greg	1.24	getparam(s+2, "limit weight", 'r', &minweight);
421	greg	1.1	break;
422			case 'r': /* reflection */
423	greg	1.24	getparam(s+2, "limit reflection", 'i', &maxdepth);
424	greg	1.1	break;
425			default:
426			goto badparam;
427			}
428			break;
429	greg	1.5	case 'd': /* direct */
430			switch (s[1]) {
431			case 'j': /* jitter */
432	greg	1.24	getparam(s+2, "direct jitter", 'r', &dstrsrc);
433	greg	1.9	break;
434			case 'c': /* certainty */
435	greg	1.24	getparam(s+2, "direct certainty", 'r', &shadcert);
436	greg	1.5	break;
437	greg	1.8	case 't': /* threshold */
438	greg	1.24	getparam(s+2, "direct threshold", 'r', &shadthresh);
439	greg	1.5	break;
440	greg	1.23	case 'i': /* invisibility */
441	greg	1.24	getparam(s+2, "direct invisibility",
442			'b', &directinvis);
443	greg	1.30	break;
444			case 's': /* sampling */
445			getparam(s+2, "direct sampling", 'r', &srcsizerat);
446	greg	1.23	break;
447	greg	1.5	default:
448	greg	1.1	goto badparam;
449			}
450	greg	1.23	break;
451			case 'b': /* black and white */
452	greg	1.24	getparam(s+1, "black and white", 'b', &greyscale);
453	greg	1.23	break;
454			case 'i': /* irradiance */
455	greg	1.24	getparam(s+1, "irradiance", 'b', &do_irrad);
456	greg	1.1	break;
457			case 'a': /* ambient */
458			switch (s[1]) {
459			case 'v': /* value */
460	greg	1.24	getparam(s+2, "ambient value", 'C', ambval);
461	greg	1.1	break;
462			case 'a': /* accuracy */
463	greg	1.24	getparam(s+2, "ambient accuracy", 'r', &ambacc);
464	greg	1.1	break;
465			case 'd': /* divisions */
466	greg	1.24	getparam(s+2, "ambient divisions", 'i', &ambdiv);
467	greg	1.1	break;
468			case 's': /* samples */
469	greg	1.24	getparam(s+2, "ambient super-samples", 'i', &ambssamp);
470	greg	1.1	break;
471			case 'b': /* bounces */
472	greg	1.24	getparam(s+2, "ambient bounces", 'i', &ambounce);
473	greg	1.1	break;
474			case 'r':
475	greg	1.31	if (getparam(s+2, "ambient resolution", 'i', &ambres))
476	greg	2.8	setambres(ambres);
477	greg	1.1	break;
478			default:
479			goto badparam;
480			}
481			break;
482	greg	2.5	case 'p': /* pixel */
483	greg	1.1	switch (s[1]) {
484	greg	2.5	case 's': /* sample */
485			if (getparam(s+2, "pixel sample", 'i', &psample))
486	greg	1.31	pdepth = 0;
487	greg	1.1	break;
488	greg	1.8	case 't': /* threshold */
489	greg	2.5	if (getparam(s+2, "pixel threshold", 'r', &maxdiff))
490	greg	1.31	pdepth = 0;
491	greg	2.5	break;
492			default:
493			goto badparam;
494			}
495			break;
496			case 's': /* specular */
497			switch (s[1]) {
498			case 'j': /* jitter */
499			getparam(s+2, "specular jitter", 'r', &specjitter);
500			break;
501			case 't': /* threshold */
502			getparam(s+2, "specular threshold", 'r', &specthresh);
503	greg	1.1	break;
504			default:
505			goto badparam;
506			}
507			break;
508			case '\0': /* nothing */
509			break;
510			default:;
511			badparam:
512	greg	1.26	*sskip(s) = '\0';
513	greg	1.1	sprintf(errmsg, "%s: unknown variable", s);
514			error(COMMAND, errmsg);
515			break;
516			}
517			}
518
519
520			traceray(s) /* trace a single ray */
521			char *s;
522			{
523			char buf[128];
524			int x, y;
525			RAY thisray;
526
527	greg	2.6	if (!sscanvec(s, thisray.rorg) \|\|
528			!sscanvec(sskip(sskip(sskip(s))), thisray.rdir)) {
529	greg	1.1
530			if (dev->getcur == NULL)
531			return;
532			(*dev->comout)("Pick ray\n");
533			if ((*dev->getcur)(&x, &y) == ABORT)
534			return;
535
536	greg	1.21	if (viewray(thisray.rorg, thisray.rdir, &ourview,
537			(x+.5)/hresolu, (y+.5)/vresolu) < 0) {
538			error(COMMAND, "not on image");
539			return;
540			}
541
542	greg	1.1	} else if (normalize(thisray.rdir) == 0.0) {
543			error(COMMAND, "zero ray direction");
544			return;
545			}
546
547			rayorigin(&thisray, NULL, PRIMARY, 1.0);
548
549			rayvalue(&thisray);
550
551			if (thisray.ro == NULL)
552			(*dev->comout)("ray hit nothing");
553			else {
554			sprintf(buf, "ray hit %s %s \"%s\"",
555			objptr(thisray.ro->omod)->oname,
556			ofun[thisray.ro->otype].funame,
557			thisray.ro->oname);
558			(*dev->comout)(buf);
559	greg	1.18	(*dev->comin)(buf, NULL);
560	greg	1.1	if (thisray.rot >= FHUGE)
561			(*dev->comout)("at infinity");
562			else {
563			sprintf(buf, "at (%.6g %.6g %.6g)", thisray.rop[0],
564			thisray.rop[1], thisray.rop[2]);
565			(*dev->comout)(buf);
566			}
567	greg	1.18	(*dev->comin)(buf, NULL);
568	greg	1.32	sprintf(buf, "value (%.5g %.5g %.5g) (%.1fL)",
569	greg	1.1	colval(thisray.rcol,RED),
570			colval(thisray.rcol,GRN),
571	greg	1.32	colval(thisray.rcol,BLU),
572			luminance(thisray.rcol));
573	greg	1.1	(*dev->comout)(buf);
574			}
575	greg	1.18	(*dev->comin)(buf, NULL);
576	greg	1.1	}
577
578
579			writepict(s) /* write the picture to a file */
580			char *s;
581			{
582			static char buf[128];
583	greg	1.10	char *fname;
584	greg	1.1	FILE *fp;
585			COLR *scanline;
586			int y;
587
588			if (sscanf(s, "%s", buf) != 1 && buf[0] == '\0') {
589			error(COMMAND, "no file");
590			return;
591			}
592	greg	1.10	if ((fname = getpath(buf, NULL, 0)) == NULL \|\|
593	greg	1.1	(fp = fopen(fname, "w")) == NULL) {
594			sprintf(errmsg, "cannot open \"%s\"", buf);
595			error(COMMAND, errmsg);
596			return;
597			}
598			(*dev->comout)("writing \"");
599			(*dev->comout)(fname);
600			(*dev->comout)("\"...\n");
601			/* write header */
602			fputs(progname, fp);
603			fprintview(&ourview, fp);
604	greg	1.29	if (octname != NULL)
605			fprintf(fp, " %s\n", octname);
606			else
607			putc('\n', fp);
608	greg	1.28	fprintf(fp, "SOFTWARE= %s\n", VersionID);
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	1.22	fputformat(COLRFMT, fp);
614	greg	1.11	putc('\n', fp);
615	greg	1.33	fprtresolu(hresolu, vresolu, fp);
616	greg	1.1
617	greg	1.14	scanline = (COLR )malloc(hresolusizeof(COLR));
618	greg	1.27	if (scanline == NULL) {
619			error(COMMAND, "not enough memory!");
620			fclose(fp);
621			unlink(fname);
622			return;
623			}
624	greg	1.14	for (y = vresolu-1; y >= 0; y--) {
625			getpictcolrs(y, scanline, &ptrunk, hresolu, vresolu);
626			if (fwritecolrs(scanline, hresolu, fp) < 0)
627	greg	1.1	break;
628			}
629	greg	1.27	free((char *)scanline);
630	greg	1.1	if (fclose(fp) < 0)
631			error(COMMAND, "write error");
632			}