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#include "random.h" |
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VIEWPOINT myeye; /* target view position */ |
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packrays(rod, p) /* pack ray origins and directions */ |
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register float *rod; |
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register PACKET *p; |
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{ |
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static FVECT ro, rd; |
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short packord[RPACKSIZ]; |
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float packdc[RPACKSIZ]; |
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int iterleft = 3*p->nr; |
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BYTE rpos[2][2]; |
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FVECT ro, rd, rp1; |
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GCOORD gc[2]; |
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int ila[2], hsh; |
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double d, sl[4]; |
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register int i; |
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double d, dc, meandist; |
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int i; |
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register int ii; |
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if (!hdbcoord(gc, hdlist[p->hd], p->bi)) |
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error(CONSISTENCY, "bad beam index in packrays"); |
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ila[0] = p->hd; ila[1] = p->bi; |
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hsh = ilhash(ila,2) + p->nc; |
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for (i = 0; i < p->nr; i++) { |
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multisamp(sl, 4, urand(hsh+i)); |
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p->ra[i].r[0][0] = sl[0] * 256.; |
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p->ra[i].r[0][1] = sl[1] * 256.; |
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p->ra[i].r[1][0] = sl[2] * 256.; |
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p->ra[i].r[1][1] = sl[3] * 256.; |
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d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r); |
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if (!vdef(OBSTRUCTIONS)) |
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d *= frandom(); /* random offset */ |
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for (i = 0, meandist = 0.; i < p->nr || meandist > myeye.rng+FTINY; ) { |
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rpos[0][0] = frandom() * 256.; |
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rpos[0][1] = frandom() * 256.; |
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rpos[1][0] = frandom() * 256.; |
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rpos[1][1] = frandom() * 256.; |
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d = hdray(ro, rd, hdlist[p->hd], gc, rpos); |
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if (myeye.rng > FTINY) { /* check eyepoint */ |
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register int nexti; |
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VSUM(rp1, ro, rd, d); |
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dc = sqrt(dist2line(myeye.vpt, ro, rp1)) / p->nr; |
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if (i == p->nr) { /* packet full */ |
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nexti = packord[i-1]; |
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if (!iterleft--) |
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break; /* tried enough! */ |
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if (dc >= packdc[nexti]) |
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continue; /* worse than worst */ |
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meandist -= packdc[nexti]; |
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} else |
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nexti = i++; |
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meandist += packdc[nexti] = dc; /* new distance */ |
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for (ii = i; --ii; ) { /* insertion sort */ |
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if (dc > packdc[packord[ii-1]]) |
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break; |
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packord[ii] = packord[ii-1]; |
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} |
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packord[ii] = nexti; |
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ii = nexti; /* put it here */ |
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} else |
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ii = i++; |
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if (p->offset != NULL) { |
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if (!vdef(OBSTRUCTIONS)) |
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d *= frandom(); /* random offset */ |
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VSUM(ro, ro, rd, d); /* advance ray */ |
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p->offset[i] = d; |
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p->offset[ii] = d; |
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} |
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VCOPY(rod, ro); |
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rod += 3; |
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VCOPY(rod, rd); |
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rod += 3; |
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p->ra[ii].r[0][0] = rpos[0][0]; |
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p->ra[ii].r[0][1] = rpos[0][1]; |
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p->ra[ii].r[1][0] = rpos[1][0]; |
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p->ra[ii].r[1][1] = rpos[1][1]; |
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VCOPY(rod+6*ii, ro); |
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VCOPY(rod+6*ii+3, rd); |
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} |
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#ifdef DEBUG |
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fprintf(stderr, "%f mean distance for target %f (%d iterations)\n", |
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meandist, myeye.rng, 3*p->nr - iterleft); |
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#endif |
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} |
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