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/* Copyright (c) 1987 Regents of the University of California */ |
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/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#include "random.h" |
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#ifndef WFLUSH |
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#define WFLUSH 30 /* flush after this many rays */ |
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#ifdef SPEED |
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#define WFLUSH (5*SPEED) |
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#else |
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#define WFLUSH 100 /* flush after this many rays */ |
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#endif |
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#endif |
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#ifdef SMLFLT |
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#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3) |
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#else |
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#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3) |
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#endif |
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getrect(s, r) /* get a box */ |
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char *s; |
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register RECT *r; |
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error(COMMAND, "illegal magnification"); |
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return(-1); |
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} |
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if (sscanf(s, "%*lf %lf %lf %lf", &vec[0], &vec[1], &vec[2]) != 3) { |
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if (!sscanvec(sskip(s), vec)) { |
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if (dev->getcur == NULL) |
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return(-1); |
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(*dev->comout)("Pick view center\n"); |
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if ((*dev->getcur)(&x, &y) == ABORT) |
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return(-1); |
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viewray(thisray.rorg, thisray.rdir, &ourview, |
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(x+.5)/hresolu, (y+.5)/vresolu); |
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if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, |
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&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) { |
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error(COMMAND, "not on image"); |
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return(-1); |
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} |
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if (!direc || ourview.type == VT_PAR) { |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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if (!localhit(&thisray, &thescene)) { |
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register PNODE *p; |
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int xmin, ymin, xmax, ymax; |
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{ |
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extern long nrays; |
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static long lastflush = 0; |
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extern unsigned long nrays; |
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static unsigned long lastflush = 0; |
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static RAY thisray; |
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double h, v; |
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register int i; |
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if (xmax - xmin <= 0 || ymax - ymin <= 0) { /* empty */ |
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p->x = xmin; |
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h = xmin + (xmax-xmin)*frandom(); |
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v = ymin + (ymax-ymin)*frandom(); |
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viewray(thisray.rorg, thisray.rdir, &ourview, h/hresolu, v/vresolu); |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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rayvalue(&thisray); |
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if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview, |
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h/hresolu, v/vresolu)) < -FTINY) { |
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setcolor(thisray.rcol, 0.0, 0.0, 0.0); |
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} else { |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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samplendx++; |
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rayvalue(&thisray); |
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} |
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p->x = h; |
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p->y = v; |
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{ |
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/* free old image */ |
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freepkids(&ptrunk); |
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/* save reserve memory */ |
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fillreserves(); |
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/* compute resolution */ |
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hresolu = dev->xsiz; |
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vresolu = dev->ysiz; |
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double angle, elev, mag; |
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FVECT vc; |
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{ |
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extern double sqrt(), dist2(); |
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double d; |
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FVECT v1; |
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VIEW nv; |
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d = 0.0; /* don't move closer */ |
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for (i = 0; i < 3; i++) |
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d += (vc[i] - ourview.vp[i])*ourview.vdir[i]; |
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nv.vfore = ourview.vfore; |
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nv.vaft = ourview.vaft; |
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} else { |
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nv.horiz = ourview.horiz; |
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nv.vert = ourview.vert; |
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d = sqrt(dist2(ourview.vp, vc)) / mag; |
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nv.vfore = ourview.vfore + d - d*mag; |
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if (nv.vfore < 0.0) nv.vfore = 0.0; |
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nv.vaft = ourview.vaft + d - d*mag; |
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if (nv.vaft < nv.vfore) nv.vaft = 0.0; |
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} |
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for (i = 0; i < 3; i++) |
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nv.vp[i] = vc[i] - d*nv.vdir[i]; |
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} |
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spinvector(vres, vorig, vnorm, theta) /* rotate vector around normal */ |
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FVECT vres, vorig, vnorm; |
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double theta; |
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zoomview(vp, zf) /* zoom in our out */ |
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register VIEW *vp; |
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double zf; |
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{ |
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extern double sin(), cos(); |
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double sint, cost, dotp; |
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FVECT vperp; |
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register int i; |
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if (theta == 0.0) { |
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VCOPY(vres, vorig); |
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switch (vp->type) { |
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case VT_PAR: /* parallel view */ |
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case VT_ANG: /* angular fisheye */ |
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vp->horiz /= zf; |
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vp->vert /= zf; |
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return; |
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case VT_PER: /* perspective view */ |
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vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) / |
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(PI/180./2.); |
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vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / |
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(PI/180./2.); |
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return; |
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case VT_HEM: /* hemispherical fisheye */ |
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vp->horiz = sin(vp->horiz*(PI/180./2.))/zf; |
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if (vp->horiz >= 1.0-FTINY) |
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vp->horiz = 180.; |
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else |
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vp->horiz = asin(vp->horiz) / (PI/180./2.); |
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vp->vert = sin(vp->vert*(PI/180./2.))/zf; |
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if (vp->vert >= 1.0-FTINY) |
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vp->vert = 180.; |
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else |
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vp->vert = asin(vp->vert) / (PI/180./2.); |
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return; |
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} |
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sint = sin(theta); |
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cost = cos(theta); |
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dotp = DOT(vorig, vnorm); |
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fcross(vperp, vnorm, vorig); |
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for (i = 0; i < 3; i++) |
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vres[i] = vnorm[i]*dotp*(1.-cost) + |
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vorig[i]*cost + vperp[i]*sint; |
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} |
