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#ifndef NVSAMPS |
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#define NVSAMPS 4096 /* number of ray samples per view */ |
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#endif |
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#ifndef MEYERNG |
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#define MEYERNG 0.2 /* target mean eye range (rel. to grid) */ |
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#endif |
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#ifndef MAXTODO |
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#define MAXTODO 3 /* maximum sections to look at */ |
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#define MAXDRAT 3.0 /* maximum distance ratio */ |
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#endif |
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#ifndef MAXDRAT |
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#define MAXDRAT 3.0 /* maximum distance ratio btwn. cand. sect. */ |
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#endif |
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#define CBEAMBLK 1024 /* cbeam allocation block size */ |
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int4 nr; /* number of samples desired */ |
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} *cbeam = NULL; /* current beam list */ |
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VIEWPOINT cureye; /* current eye position */ |
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static int ncbeams = 0; /* number of sorted beams in cbeam */ |
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static int xcbeams = 0; /* extra (unregistered) beams past ncbeams */ |
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static int maxcbeam = 0; /* size of cbeam array */ |
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else /* else clear sample requests */ |
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for (i = ncbeams+xcbeams; i--; ) |
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cbeam[i].nr = 0; |
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cureye.rng = 0.; |
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} |
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VIEW *vn; |
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int hr, vr; |
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{ |
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int todo[MAXTODO+1]; |
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int n; |
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int todo[MAXTODO+1], n; |
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double hdgsiz, d; |
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register HOLO *hp; |
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register int i; |
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/* sort our list */ |
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cbeamsort(1); |
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/* add view to nearby sections */ |
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if (!(n = comptodo(todo, vn))) |
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return(0); |
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while (n--) |
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addview(todo[n], vn, hr, vr); |
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for (i = 0; i < n; i++) |
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addview(todo[i], vn, hr, vr); |
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if (MEYERNG <= FTINY || vn->type == VT_PAR) |
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return(1); |
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hdgsiz = 0.; d = 1./3. / n; /* compute mean grid size */ |
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for (i = 0; i < n; i++) { |
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hp = hdlist[todo[i]]; |
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hdgsiz += d * ( VLEN(hp->xv[0])/hp->grid[0] + |
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VLEN(hp->xv[1])/hp->grid[1] + |
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VLEN(hp->xv[2])/hp->grid[2] ) ; |
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} |
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/* add to current eye position */ |
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if (cureye.rng <= FTINY) { |
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VCOPY(cureye.vpt, vn->vp); |
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cureye.rng = MEYERNG * hdgsiz; |
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} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + MEYERNG*hdgsiz > |
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cureye.rng) { |
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for (i = 3; i--; ) |
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cureye.vpt[i] = 0.5*(cureye.vpt[i] + vn->vp[i]); |
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cureye.rng = 0.5*(cureye.rng + MEYERNG*hdgsiz + d); |
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} |
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return(1); |
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} |
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beam_sync(all) /* update beam list on server */ |
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int all; |
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{ |
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/* set new eye position */ |
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serv_request(DR_VIEWPOINT, sizeof(VIEWPOINT), (char *)&cureye); |
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/* sort list (put orphans at end) */ |
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cbeamsort(all < 0); |
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/* send beam request */ |
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if (all) |
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cbeamop(DR_NEWSET, cbeam, ncbeams); |
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else |