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greg |
2.1 |
#ifndef lint
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greg |
2.3 |
static const char RCSid[] = "$Id: jitteraperture.c,v 2.2 2021/12/15 01:38:50 greg Exp $";
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greg |
2.1 |
#endif
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/*
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* jitteraperture.c - routine to sample depth-of-field
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*
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* External symbols declared in view.h
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*/
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#include "copyright.h"
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#include <stdio.h>
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#include "rtmath.h"
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#include "random.h"
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#include "view.h"
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int
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jitteraperture( /* random aperture shift for depth-of-field */
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FVECT orig, /* assigned previously by... */
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FVECT direc, /* ...viewray() call */
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VIEW *v,
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double dia
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)
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{
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greg |
2.2 |
RREAL df[2];
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greg |
2.3 |
double adj;
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greg |
2.1 |
int i;
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/* are we even needed? */
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if (dia <= FTINY)
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return(1);
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/* get random point on disk */
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greg |
2.2 |
square2disk(df, frandom(), frandom());
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greg |
2.1 |
df[0] *= .5*dia;
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df[1] *= .5*dia;
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greg |
2.3 |
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greg |
2.1 |
if ((v->type == VT_PER) | (v->type == VT_PAR)) {
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greg |
2.3 |
adj = 1.0; /* basic view cases */
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greg |
2.1 |
if (v->type == VT_PER)
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adj /= DOT(direc, v->vdir);
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df[0] /= sqrt(v->hn2);
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df[1] /= sqrt(v->vn2);
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for (i = 3; i--; ) {
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greg |
2.3 |
orig[i] = v->vp[i] + df[0]*v->hvec[i] +
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greg |
2.1 |
df[1]*v->vvec[i] ;
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greg |
2.3 |
direc[i] = v->vp[i] + adj*v->vdist*direc[i]
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- orig[i];
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greg |
2.1 |
}
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} else { /* difficult view cases */
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greg |
2.3 |
adj = PI/4.*dia*(.5 - frandom());
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greg |
2.1 |
if ((v->type != VT_ANG) & (v->type != VT_PLS)) {
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if (v->type != VT_CYL)
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df[0] /= sqrt(v->hn2);
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df[1] /= sqrt(v->vn2);
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}
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for (i = 3; i--; ) {
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greg |
2.3 |
orig[i] = v->vp[i] + df[0]*v->hvec[i] +
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greg |
2.1 |
df[1]*v->vvec[i] +
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greg |
2.3 |
adj*v->vdir[i] ;
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direc[i] = v->vp[i] + v->vdist*direc[i]
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- orig[i];
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greg |
2.1 |
}
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}
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greg |
2.3 |
if (normalize(direc) == 0.0)
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return(0);
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if ((adj = v->vfore) <= FTINY)
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return(1);
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if (v->type == VT_PER)
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adj /= DOT(direc, v->vdir);
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VSUM(orig, orig, direc, adj);
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return(1);
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greg |
2.1 |
}
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