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RadiancePmap/rv2.c
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rv2.c
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#ifndef lint
static const char RCSid[] = "$Id: rv2.c,v 2.72 2021/02/12 00:41:19 greg Exp $";
#endif
/*
* rv2.c - command routines used in tracing a view.
*
* External symbols declared in rpaint.h
*/
#include "copyright.h"
#include <ctype.h>
#include <string.h>
#include "platform.h"
#include "rtprocess.h" /* win_popen() */
#include "paths.h"
#include "ray.h"
#include "ambient.h"
#include "otypes.h"
#include "otspecial.h"
#include "rpaint.h"
extern int psample; /* pixel sample size */
extern double maxdiff; /* max. sample difference */
#define CTRL(c) ((c)-'@')
#define sscanvec(s,v) (sscanf(s,FVFORMAT,v,v+1,v+2)==3)
extern char rifname[128]; /* rad input file name */
extern char *progname;
extern char *octname;
void
getframe( /* get a new frame */
char *s
)
{
if (getrect(s, &pframe) < 0)
return;
pdepth = 0;
}
void
getrepaint( /* get area and repaint */
char *s
)
{
RECT box;
if (getrect(s, &box) < 0)
return;
paintrect(&ptrunk, &box);
}
void
getview( /* get/show/save view parameters */
char *s
)
{
FILE *fp;
char buf[128];
char *fname;
int change = 0;
VIEW nv = ourview;
while (isspace(*s))
s++;
if (*s == '-') { /* command line parameters */
if (sscanview(&nv, s))
newview(&nv);
else
error(COMMAND, "bad view option(s)");
return;
}
if (nextword(buf, sizeof(buf), s) != NULL) { /* write 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);
putc('\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++;
}
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++;
sprintf(buf, "view direction (%.6g %.6g %.6g): ",
ourview.vdir[0]*ourview.vdist,
ourview.vdir[1]*ourview.vdist,
ourview.vdir[2]*ourview.vdist);
(*dev->comout)(buf);
(*dev->comin)(buf, NULL);
if (buf[0] == CTRL('C')) return;
if (sscanvec(buf, nv.vdir)) {
nv.vdist = 1.;
change++;
}
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++;
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++;
sprintf(buf, "fore and aft clipping plane (%.6g %.6g): ",
ourview.vfore, ourview.vaft);
(*dev->comout)(buf);
(*dev->comin)(buf, NULL);
if (buf[0] == CTRL('C')) return;
if (sscanf(buf, "%lf %lf", &nv.vfore, &nv.vaft) == 2)
change++;
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++;
if (change)
newview(&nv);
}
void
lastview( /* return to a previous view */
char *s
)
{
char buf[128];
char *fname;
int success;
VIEW nv;
/* get parameters from a file */
if (nextword(buf, sizeof(buf), s) != NULL) {
nv = stdview;
if ((fname = getpath(buf, "", R_OK)) == 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;
}
nv = ourview;
ourview = oldview;
oldview = nv;
newimage(NULL);
}
void
saveview( /* save view to rad file */
char *s
)
{
char view[64];
char *fname;
FILE *fp;
if (*atos(view, sizeof(view), s)) {
if (isint(view)) {
error(COMMAND, "cannot write view by number");
return;
}
s = sskip(s);
}
if (nextword(rifname, sizeof(rifname), s) == NULL && !rifname[0]) {
error(COMMAND, "no previous rad file");
return;
}
if ((fname = getpath(rifname, NULL, 0)) == NULL ||
(fp = fopen(fname, "a")) == NULL) {
sprintf(errmsg, "cannot open \"%s\"", rifname);
error(COMMAND, errmsg);
return;
}
fputs("view= ", fp);
fputs(view, fp);
fprintview(&ourview, fp);
putc('\n', fp);
fclose(fp);
}
void
loadview( /* load view from rad file */
char *s
)
{
char buf[512];
char *fname;
FILE *fp;
VIEW nv;
strcpy(buf, "rad -n -s -V -v ");
if (sscanf(s, "%s", buf+strlen(buf)) == 1)
s = sskip(s);
else
strcat(buf, "1");
if (nextword(rifname, sizeof(rifname), s) == NULL && !rifname[0]) {
error(COMMAND, "no previous rad file");
return;
}
if ((fname = getpath(rifname, "", R_OK)) == NULL) {
sprintf(errmsg, "cannot access \"%s\"", rifname);
error(COMMAND, errmsg);
return;
}
sprintf(buf+strlen(buf), " %s", fname);
if ((fp = popen(buf, "r")) == NULL) {
error(COMMAND, "cannot run rad");
return;
}
buf[0] = '\0';
fgets(buf, sizeof(buf), fp);
pclose(fp);
nv = stdview;
if (!sscanview(&nv, buf)) {
error(COMMAND, "rad error -- no such view?");
return;
}
newview(&nv);
}
void
getaim( /* aim camera */
char *s
)
{
VIEW nv = ourview;
double zfact;
if (getinterest(s, 1, nv.vdir, &zfact) < 0)
return;
zoomview(&nv, zfact);
newview(&nv);
}
void
getfocus( /* set focus distance */
char *s
)
{
char buf[64];
double dist;
if (sscanf(s, "%lf", &dist) < 1) {
int x, y;
RAY thisray;
if (dev->getcur == NULL)
return;
(*dev->comout)("Pick focus point\n");
if ((*dev->getcur)(&x, &y) == ABORT)
return;
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
error(COMMAND, "not on image");
return;
}
rayorigin(&thisray, PRIMARY, NULL, NULL);
if (!localhit(&thisray, &thescene)) {
error(COMMAND, "not a local object");
return;
}
dist = thisray.rot;
} else if (dist <= .0) {
error(COMMAND, "focus distance must be positive");
return;
}
ourview.vdist = dist;
sprintf(buf, "Focus distance set to %f\n", dist);
(*dev->comout)(buf);
}
void
getmove( /* move camera */
char *s
)
{
FVECT vc;
double mag;
if (getinterest(s, 0, vc, &mag) < 0)
return;
moveview(0.0, 0.0, mag, vc);
}
void
getrotate( /* rotate camera */
char *s
)
{
VIEW nv = ourview;
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;
}
spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
if (elev != 0.0)
geodesic(nv.vdir, nv.vdir, nv.vup, elev*(PI/180.), GEOD_RAD);
zoomview(&nv, zfact);
newview(&nv);
}
void
getpivot( /* pivot viewpoint */
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(sskip2(s,2), 0, vc, &mag) < 0)
return;
moveview(angle, elev, mag, vc);
}
void
getorigin( /* origin viewpoint */
char *s
)
{
VIEW nv = ourview;
double d;
/* get new view origin */
if (sscanf(s, "%lf %lf", &d, &d) == 1) {
/* just moving some distance */
VSUM(nv.vp, nv.vp, nv.vdir, d);
} else if (!sscanvec(s, nv.vp)) {
int x, y; /* need to pick origin */
RAY thisray;
if (dev->getcur == NULL)
return;
(*dev->comout)("Pick point on surface for new origin\n");
if ((*dev->getcur)(&x, &y) == ABORT)
return;
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
error(COMMAND, "not on image");
return;
}
rayorigin(&thisray, PRIMARY, NULL, NULL);
if (!localhit(&thisray, &thescene)) {
error(COMMAND, "not a local object");
return;
}
if (thisray.rod < 0.0) /* don't look through other side */
flipsurface(&thisray);
VSUM(nv.vp, thisray.rop, thisray.ron, 20.0*FTINY);
VCOPY(nv.vdir, thisray.ron);
} else if (!sscanvec(sskip2(s,3), nv.vdir) || normalize(nv.vdir) == 0.0)
VCOPY(nv.vdir, ourview.vdir);
d = DOT(nv.vdir, nv.vup); /* need different up vector? */
if (d*d >= 1.-2.*FTINY) {
int i;
nv.vup[0] = nv.vup[1] = nv.vup[2] = 0.0;
for (i = 3; i--; )
if (nv.vdir[i]*nv.vdir[i] < 0.34)
break;
nv.vup[i] = 1.;
}
newview(&nv);
}
void
getexposure( /* get new exposure */
char *s
)
{
char buf[128];
char *cp;
int x, y;
PNODE *p = &ptrunk;
int adapt = 0;
double e = 1.0;
for (cp = s; isspace(*cp); cp++)
;
if (*cp == '@') {
adapt++;
while (isspace(*++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;
p = findrect(x, y, &ptrunk, -1);
} else {
if (*cp == '=') { /* absolute setting */
p = NULL;
e = 1.0/exposure;
for (cp++; isspace(*cp); cp++)
;
if (*cp == '\0') { /* interactive */
sprintf(buf, "exposure (%f): ", exposure);
(*dev->comout)(buf);
(*dev->comin)(buf, NULL);
for (cp = buf; isspace(*cp); cp++)
;
if (*cp == '\0')
return;
}
}
if (*cp == '+' || *cp == '-') /* f-stops */
e *= pow(2.0, atof(cp));
else /* multiplier */
e *= atof(cp);
}
if (p != NULL) { /* relative setting */
compavg(p);
if (bright(p->v) < 1e-15) {
error(COMMAND, "cannot normalize to zero");
return;
}
if (adapt)
e *= 106./pow(1.219+pow(luminance(p->v)/exposure,.4),2.5)/exposure;
else
e *= 0.5 / bright(p->v);
}
if (e <= FTINY || fabs(1.0 - e) <= FTINY)
return;
scalepict(&ptrunk, e);
exposure *= e;
redraw();
}
typedef union {int i; double d; COLOR C;} *MyUptr;
int
getparam( /* get variable from user */
char *str,
char *dsc,
int typ,
void *p
)
{
MyUptr ptr = (MyUptr)p;
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);
}
if (ptr->i == i0)
return(0);
ptr->i = i0;
break;
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);
}
if (FABSEQ(ptr->d, d0))
return(0);
ptr->d = d0;
break;
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')
return(0);
}
if (strchr("yY+1tTnN-0fF", buf[0]) == NULL)
return(0);
i0 = strchr("yY+1tT", buf[0]) != NULL;
if (ptr->i == i0)
return(0);
ptr->i = i0;
break;
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);
}
if (FABSEQ(colval(ptr->C,RED), d0) &&
FABSEQ(colval(ptr->C,GRN), d1) &&
FABSEQ(colval(ptr->C,BLU), d2))
return(0);
setcolor(ptr->C, d0, d1, d2);
break;
default:
return(0); /* shouldn't happen */
}
newparam++;
return(1);
}
void
setparam( /* get/set program parameter */
char *s
)
{
int prev_newp = newparam;
char buf[128];
if (s[0] == '\0') {
(*dev->comout)(
"aa ab ad ar as av aw b bv dc dv dj ds dt i lr lw me ma mg ms ps pt ss st u: ");
(*dev->comin)(buf, NULL);
s = buf;
}
switch (s[0]) {
case 'u': /* uncorrelated sampling */
getparam(s+1, "uncorrelated sampling", 'b',
(void *)&rand_samp);
break;
case 'l': /* limit */
switch (s[1]) {
case 'w': /* weight */
getparam(s+2, "limit weight", 'r',
(void *)&minweight);
break;
case 'r': /* reflection */
getparam(s+2, "limit reflection", 'i',
(void *)&maxdepth);
break;
default:
goto badparam;
}
break;
case 'd': /* direct */
switch (s[1]) {
case 'j': /* jitter */
getparam(s+2, "direct jitter", 'r',
(void *)&dstrsrc);
break;
case 'c': /* certainty */
getparam(s+2, "direct certainty", 'r',
(void *)&shadcert);
break;
case 't': /* threshold */
getparam(s+2, "direct threshold", 'r',
(void *)&shadthresh);
break;
case 'v': /* visibility */
getparam(s+2, "direct visibility", 'b',
(void *)&directvis);
break;
case 's': /* sampling */
getparam(s+2, "direct sampling", 'r',
(void *)&srcsizerat);
break;
default:
goto badparam;
}
break;
case 'b': /* back faces or black and white */
switch (s[1]) {
case 'v': /* back face visibility */
getparam(s+2, "back face visibility", 'b',
(void *)&backvis);
break;
case '\0': /* black and white */
case ' ':
case 'y': case 'Y': case 't': case 'T': case '1': case '+':
case 'n': case 'N': case 'f': case 'F': case '0': case '-':
getparam(s+1, "black and white", 'b',
(void *)&greyscale);
newparam = prev_newp;
break;
default:
goto badparam;
}
break;
case 'i': /* irradiance */
getparam(s+1, "irradiance", 'b',
(void *)&do_irrad);
break;
case 'a': /* ambient */
switch (s[1]) {
case 'v': /* value */
getparam(s+2, "ambient value", 'C',
(void *)ambval);
break;
case 'w': /* weight */
getparam(s+2, "ambient value weight", 'i',
(void *)&ambvwt);
break;
case 'a': /* accuracy */
if (getparam(s+2, "ambient accuracy", 'r',
(void *)&ambacc))
setambacc(ambacc);
break;
case 'd': /* divisions */
getparam(s+2, "ambient divisions", 'i',
(void *)&ambdiv);
break;
case 's': /* samples */
getparam(s+2, "ambient super-samples", 'i',
(void *)&ambssamp);
break;
case 'b': /* bounces */
getparam(s+2, "ambient bounces", 'i',
(void *)&ambounce);
break;
case 'r':
if (getparam(s+2, "ambient resolution", 'i',
(void *)&ambres))
setambres(ambres);
break;
default:
goto badparam;
}
break;
case 'm': /* medium */
switch (s[1]) {
case 'e': /* extinction coefficient */
getparam(s+2, "extinction coefficient", 'C',
(void *)cextinction);
break;
case 'a': /* scattering albedo */
getparam(s+2, "scattering albedo", 'C',
(void *)salbedo);
break;
case 'g': /* scattering eccentricity */
getparam(s+2, "scattering eccentricity", 'r',
(void *)&seccg);
break;
case 's': /* sampling distance */
getparam(s+2, "mist sampling distance", 'r',
(void *)&ssampdist);
break;
default:
goto badparam;
}
break;
case 'p': /* pixel */
switch (s[1]) {
case 's': /* sample */
if (getparam(s+2, "pixel sample", 'i',
(void *)&psample))
pdepth = 0;
break;
case 't': /* threshold */
if (getparam(s+2, "pixel threshold", 'r',
(void *)&maxdiff))
pdepth = 0;
break;
default:
goto badparam;
}
newparam = prev_newp;
break;
case 's': /* specular */
switch (s[1]) {
case 's': /* sampling */
getparam(s+2, "specular sampling", 'r',
(void *)&specjitter);
break;
case 't': /* threshold */
getparam(s+2, "specular threshold", 'r',
(void *)&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;
}
}
void
traceray( /* trace a single ray */
char *s
)
{
RAY thisray;
char buf[512];
thisray.rmax = 0.0;
if (!sscanvec(s, thisray.rorg) ||
!sscanvec(sskip2(s,3), thisray.rdir)) {
int x, y;
if (dev->getcur == NULL)
return;
(*dev->comout)("Pick ray\n");
if ((*dev->getcur)(&x, &y) == ABORT)
return;
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
error(COMMAND, "not on image");
return;
}
} else if (normalize(thisray.rdir) == 0.0) {
error(COMMAND, "zero ray direction");
return;
}
ray_trace(&thisray);
if (thisray.ro == NULL)
(*dev->comout)("ray hit nothing");
else {
OBJREC *mat = NULL;
OBJREC *mod = NULL;
char matspec[256];
OBJREC *ino;
matspec[0] = '\0';
if (thisray.ro->omod != OVOID) {
mod = objptr(thisray.ro->omod);
mat = findmaterial(thisray.ro);
}
if (thisray.rod < 0.0)
strcpy(matspec, "back of ");
if (mod != NULL) {
strcat(matspec, mod->oname);
if (mat != mod && mat != NULL)
sprintf(matspec+strlen(matspec),
" (%s)", mat->oname);
} else
strcat(matspec, VOIDID);
sprintf(buf, "ray hit %s %s \"%s\"", matspec,
ofun[thisray.ro->otype].funame,
thisray.ro->oname);
if ((ino = objptr(thisray.robj)) != thisray.ro)
sprintf(buf+strlen(buf), " in %s \"%s\"",
ofun[ino->otype].funame, ino->oname);
(*dev->comout)(buf);
(*dev->comin)(buf, NULL);
if (thisray.rot >= FHUGE*.99)
(*dev->comout)("at infinity");
else {
sprintf(buf, "at (%.6g %.6g %.6g) (%.6g)",
thisray.rop[0], thisray.rop[1],
thisray.rop[2], raydistance(&thisray));
(*dev->comout)(buf);
}
(*dev->comin)(buf, NULL);
sprintf(buf, "value (%.5g %.5g %.5g) (%.3gL)",
colval(thisray.rcol,RED),
colval(thisray.rcol,GRN),
colval(thisray.rcol,BLU),
luminance(thisray.rcol));
(*dev->comout)(buf);
}
(*dev->comin)(buf, NULL);
}
void
writepict( /* write the picture to a file */
char *s
)
{
static char buf[128];
char *fname;
FILE *fp;
COLR *scanline;
int y;
/* XXX relies on words.c 2.11 behavior */
if (nextword(buf, sizeof(buf), s) == NULL && !buf[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;
}
SET_FILE_BINARY(fp);
(*dev->comout)("writing \"");
(*dev->comout)(fname);
(*dev->comout)("\"...\n");
/* write header */
newheader("RADIANCE", fp);
fputs(progname, fp);
fprintview(&ourview, fp);
if (octname != NULL)
fprintf(fp, " %s\n", octname);
else
putc('\n', fp);
fprintf(fp, "SOFTWARE= %s\n", VersionID);
fputnow(fp);
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((void *)scanline);
if (fclose(fp) < 0)
error(COMMAND, "write error");
}
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