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/* Copyright (c) 1992 Regents of the University of California */ |
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/* Copyright (c) 1996 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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/* |
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* image.c - routines for image generation. |
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* |
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* 10/17/85 |
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*/ |
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#include "standard.h" |
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#include "paths.h" |
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#define FEQ(x,y) (fabs((x)-(y)) <= FTINY) |
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#define VEQ(v,w) (FEQ((v)[0],(w)[0]) && FEQ((v)[1],(w)[1]) \ |
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&& FEQ((v)[2],(w)[2])) |
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|
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VIEW stdview = STDVIEW; /* default view parameters */ |
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static char ill_horiz[] = "illegal horizontal view size"; |
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static char ill_vert[] = "illegal vertical view size"; |
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if (v->vfore < -FTINY || v->vaft < -FTINY || |
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(v->vaft > FTINY && v->vaft <= v->vfore)) |
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return("illegal fore/aft clipping plane"); |
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|
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if (normalize(v->vdir) == 0.0) /* normalize direction */ |
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return("zero view direction"); |
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v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
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case VT_CYL: /* cylindrical panorama */ |
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if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
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if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
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case VT_ANG: /* angular fisheye */ |
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if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
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if (v->vert > 360.0+FTINY) |
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return(ill_vert); |
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v->hn2 = v->horiz / 90.0; |
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v->vn2 = v->vert / 90.0; |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = v->vert * (PI/180.0); |
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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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if (v->horiz > 180.0+FTINY) |
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return("unknown view type"); |
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} |
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if (v->type != VT_ANG) { |
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v->hvec[0] *= v->hn2; |
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v->hvec[1] *= v->hn2; |
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v->hvec[2] *= v->hn2; |
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if (v->type != VT_CYL) { |
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v->hvec[0] *= v->hn2; |
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v->hvec[1] *= v->hn2; |
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v->hvec[2] *= v->hn2; |
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} |
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v->vvec[0] *= v->vn2; |
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v->vvec[1] *= v->vn2; |
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v->vvec[2] *= v->vn2; |
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} |
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double |
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viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
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FVECT orig, direc; |
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register VIEW *v; |
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switch(v->type) { |
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case VT_PAR: /* parallel view */ |
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orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0]; |
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orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1]; |
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orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*v->vdir[0] |
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+ x*v->hvec[0] + y*v->vvec[0]; |
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orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
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+ x*v->hvec[1] + y*v->vvec[1]; |
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orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
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+ x*v->hvec[2] + y*v->vvec[2]; |
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VCOPY(direc, v->vdir); |
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return(0); |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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case VT_PER: /* perspective view */ |
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VCOPY(orig, v->vp); |
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direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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normalize(direc); |
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return(0); |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
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case VT_HEM: /* hemispherical fisheye */ |
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z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
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if (z < 0.0) |
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return(-1); |
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return(-1.0); |
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z = sqrt(z); |
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VCOPY(orig, v->vp); |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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return(0); |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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case VT_CYL: /* cylindrical panorama */ |
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d = x * v->horiz * (PI/180.0); |
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z = cos(d); |
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x = sin(d); |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
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case VT_ANG: /* angular fisheye */ |
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x *= v->horiz/180.0; |
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y *= v->vert/180.0; |
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d = x*x + y*y; |
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if (d > 1.0) |
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return(-1); |
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VCOPY(orig, v->vp); |
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return(-1.0); |
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d = sqrt(d); |
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z = cos(PI*d); |
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d = d <= FTINY ? PI : sqrt(1 - z*z)/d; |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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return(0); |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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} |
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return(-1); |
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return(-1.0); |
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} |
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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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ip[2] = DOT(disp,v->vdir); |
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ip[2] = DOT(disp,v->vdir) - v->vfore; |
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break; |
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case VT_PER: /* perspective view */ |
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d = DOT(disp,v->vdir); |
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if (d < 0.0) { /* fold pyramid */ |
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ip[2] = -ip[2]; |
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d = -d; |
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} else if (d > FTINY) { |
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} |
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if (d > FTINY) { |
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d = 1.0/d; |
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disp[0] *= d; |
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disp[1] *= d; |
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disp[2] *= d; |
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} |
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ip[2] *= (1.0 - v->vfore*d); |
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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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d = normalize(disp); |
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ip[2] = -d; |
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else |
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ip[2] = d; |
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ip[2] -= v->vfore; |
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break; |
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case VT_CYL: /* cylindrical panorama */ |
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ip[2] = DOT(disp,v->vdir); |
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d = DOT(disp,v->hvec); |
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ip[0] = 180.0/PI * atan2(d,ip[2]) / v->horiz + 0.5 - v->hoff; |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
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if (v->vfore > FTINY) |
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ip[2] = sqrt(DOT(disp,disp)) * |
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(1.0 - v->vfore/sqrt(d*d + ip[2]*ip[2])); |
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else |
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ip[2] = sqrt(DOT(disp,disp)); |
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return; |
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case VT_ANG: /* angular fisheye */ |
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ip[0] = 0.5 - v->hoff; |
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ip[1] = 0.5 - v->voff; |
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ip[2] = normalize(disp); |
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ip[2] = normalize(disp) - v->vfore; |
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d = DOT(disp,v->vdir); |
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if (d >= 1.0-FTINY) |
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return; |
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if (d <= -(1.0-FTINY)) { |
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ip[1] += 180.0/v->horiz; |
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ip[2] += 180.0/v->vert; |
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ip[0] += 180.0/v->horiz; |
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return; |
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} |
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d = acos(d)/PI / sqrt(1.0 - d*d); |
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check(3,"f"); |
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v->vert = atof(av[1]); |
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return(1); |
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case 'o': /* fore clipping plane */ |
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check(3,"f"); |
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v->vfore = atof(av[1]); |
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return(1); |
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case 'a': /* aft clipping plane */ |
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check(3,"f"); |
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v->vaft = atof(av[1]); |
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return(1); |
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case 's': /* shift */ |
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check(3,"f"); |
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v->hoff = atof(av[1]); |
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fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
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fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
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fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
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fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
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fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
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} |
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char * |
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viewopt(vp) /* translate to minimal view string */ |
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register VIEW *vp; |
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{ |
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static char vwstr[128]; |
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register char *cp = vwstr; |
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|
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if (vp->type != stdview.type) { |
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sprintf(cp, " -vt%c", vp->type); |
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cp += strlen(cp); |
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} |
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if (!VEQ(vp->vp,stdview.vp)) { |
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sprintf(cp, " -vp %.6g %.6g %.6g", |
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vp->vp[0], vp->vp[1], vp->vp[2]); |
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cp += strlen(cp); |
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} |
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if (!VEQ(vp->vdir,stdview.vdir)) { |
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sprintf(cp, " -vd %.6g %.6g %.6g", |
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vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
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cp += strlen(cp); |
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} |
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if (!VEQ(vp->vup,stdview.vup)) { |
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sprintf(cp, " -vu %.6g %.6g %.6g", |
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vp->vup[0], vp->vup[1], vp->vup[2]); |
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cp += strlen(cp); |
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} |
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if (!FEQ(vp->horiz,stdview.horiz)) { |
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sprintf(cp, " -vh %.6g", vp->horiz); |
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cp += strlen(cp); |
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} |
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if (!FEQ(vp->vert,stdview.vert)) { |
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sprintf(cp, " -vv %.6g", vp->vert); |
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cp += strlen(cp); |
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} |
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if (!FEQ(vp->vfore,stdview.vfore)) { |
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sprintf(cp, " -vo %.6g", vp->vfore); |
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cp += strlen(cp); |
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} |
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if (!FEQ(vp->vaft,stdview.vaft)) { |
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sprintf(cp, " -va %.6g", vp->vaft); |
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cp += strlen(cp); |
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} |
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if (!FEQ(vp->hoff,stdview.hoff)) { |
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sprintf(cp, " -vs %.6g", vp->hoff); |
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cp += strlen(cp); |
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} |
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if (!FEQ(vp->voff,stdview.voff)) { |
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sprintf(cp, " -vl %.6g", vp->voff); |
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cp += strlen(cp); |
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} |
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return(vwstr); |
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} |
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