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gwlarson |
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/* Copyright (c) 1999 Silicon Graphics, Inc. */
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#ifndef lint
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static char SCCSid[] = "$SunId$ SGI";
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#endif
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/*
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* Rendering routines for rhpict.
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*/
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#include "holo.h"
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#include "view.h"
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extern VIEW myview; /* current output view */
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extern COLOR *mypixel; /* pixels being rendered */
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extern float *myweight; /* weights (used to compute final pixels) */
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extern int hres, vres; /* current horizontal and vertical res. */
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render_beam(bp, hb) /* render a particular beam */
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BEAM *bp;
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register HDBEAMI *hb;
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{
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GCOORD gc[2];
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register RAYVAL *rv;
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FVECT rorg, rdir, wp, ip;
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double d, prox;
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COLOR col;
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int n, p;
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if (!hdbcoord(gc, hb->h, hb->b))
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error(CONSISTENCY, "bad beam in render_beam");
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for (n = bp->nrm, rv = hdbray(bp); n--; rv++) {
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/* reproject each sample */
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hdray(rorg, rdir, hb->h, gc, rv->r);
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if (rv->d < DCINF) {
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d = hddepth(hb->h, rv->d);
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VSUM(wp, rorg, rdir, d);
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VSUB(ip, wp, myview.vp);
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d = DOT(ip,rdir);
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prox = 1. - d*d/DOT(ip,ip); /* sin(diff_angle)^2 */
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} else {
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if (myview.type == VT_PAR || myview.vaft > FTINY)
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continue; /* inf. off view */
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VSUM(wp, myview.vp, rdir, FHUGE);
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prox = 0.;
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}
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viewloc(ip, &myview, wp); /* frustum clipping */
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if (ip[2] < 0.)
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continue;
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if (ip[0] < 0. || ip[0] >= 1.)
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continue;
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if (ip[1] < 0. || ip[1] >= 1.)
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continue;
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if (myview.vaft > FTINY && ip[2] > myview.vaft - myview.vfore)
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continue;
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/* we're in! */
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p = (int)(ip[1]*vres)*hres + (int)(ip[0]*hres);
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colr_color(col, rv->v);
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addcolor(mypixel[p], col);
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myweight[p] += 1.0;
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}
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}
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