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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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< |
static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Rtrace support routines for holodeck rendering |
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*/ |
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#include <time.h> |
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#include "rholo.h" |
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#include "paths.h" |
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#include "random.h" |
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|
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packrays(rod, p) /* pack ray origins and directions */ |
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float *rod; |
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register PACKET *p; |
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VIEWPOINT myeye; /* target view position */ |
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|
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struct gclim { |
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HOLO *hp; /* holodeck pointer */ |
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GCOORD gc; /* grid cell */ |
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FVECT egp; /* eye grid point */ |
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double erg2; /* mean square eye grid range */ |
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double gmin[2], gmax[2]; /* grid coordinate limits */ |
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}; /* a grid coordinate range */ |
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|
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static void initeyelim(struct gclim *gcl, HOLO *hp, GCOORD *gc); |
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static void groweyelim(struct gclim *gcl, GCOORD *gc, |
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double r0, double r1, int tight); |
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static int clipeyelim(short rrng[2][2], struct gclim *gcl); |
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|
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|
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static void |
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initeyelim( /* initialize grid coordinate limits */ |
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struct gclim *gcl, |
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HOLO *hp, |
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GCOORD *gc |
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) |
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{ |
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static int nmh = 0; |
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static int *mhtab; |
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FVECT ro, rd; |
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register BEAM *bp; |
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RREAL *v; |
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int i; |
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|
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if (hp != NULL) { |
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hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt); |
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gcl->erg2 = 0; |
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for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3) |
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gcl->erg2 += DOT(v,v); |
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gcl->erg2 *= (1./3.) * myeye.rng*myeye.rng; |
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} |
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if (gc != NULL) |
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gcl->gc = *gc; |
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gcl->gmin[0] = gcl->gmin[1] = FHUGE; |
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gcl->gmax[0] = gcl->gmax[1] = -FHUGE; |
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} |
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|
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|
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static void |
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groweyelim( /* grow grid limits about eye point */ |
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struct gclim *gcl, |
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GCOORD *gc, |
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double r0, |
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double r1, |
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int tight |
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) |
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{ |
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FVECT gp, ab; |
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double ab2, od, cfact; |
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double sqcoef[3], ctcoef[3], licoef[3], cnst; |
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int gw, gi[2]; |
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double wallpos, a, b, c, d, e, f; |
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double root[2], yex; |
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int n, i, j, nex; |
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/* point/view cone */ |
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i = gc->w>>1; |
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gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0; |
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gp[hdwg0[gc->w]] = gc->i[0] + r0; |
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gp[hdwg1[gc->w]] = gc->i[1] + r1; |
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VSUB(ab, gcl->egp, gp); |
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ab2 = DOT(ab, ab); |
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gw = gcl->gc.w>>1; |
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if ((i==gw ? ab[gw]*ab[gw] : ab2) <= gcl->erg2 + FTINY) { |
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gcl->gmin[0] = gcl->gmin[1] = -FHUGE; |
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gcl->gmax[0] = gcl->gmax[1] = FHUGE; |
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return; /* too close (to wall) */ |
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} |
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ab2 = 1./ab2; /* 1/norm2(ab) */ |
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od = DOT(gp, ab); /* origin dot direction */ |
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cfact = 1./(1. - ab2*gcl->erg2); /* tan^2 + 1 of cone angle */ |
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for (i = 0; i < 3; i++) { /* compute cone equation */ |
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sqcoef[i] = ab[i]*ab[i]*cfact*ab2 - 1.; |
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ctcoef[i] = 2.*ab[i]*ab[(i+1)%3]*cfact*ab2; |
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licoef[i] = 2.*(gp[i] - ab[i]*cfact*od*ab2); |
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} |
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cnst = cfact*od*od*ab2 - DOT(gp,gp); |
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/* |
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* CONE: sqcoef[0]*x*x + sqcoef[1]*y*y + sqcoef[2]*z*z |
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* + ctcoef[0]*x*y + ctcoef[1]*y*z + ctcoef[2]*z*x |
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* + licoef[0]*x + licoef[1]*y + licoef[2]*z + cnst == 0 |
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*/ |
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/* equation for conic section in plane */ |
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gi[0] = hdwg0[gcl->gc.w]; |
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gi[1] = hdwg1[gcl->gc.w]; |
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wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0; |
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a = sqcoef[gi[0]]; /* x2 */ |
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b = ctcoef[gi[0]]; /* xy */ |
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c = sqcoef[gi[1]]; /* y2 */ |
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d = ctcoef[gw]*wallpos + licoef[gi[0]]; /* x */ |
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e = ctcoef[gi[1]]*wallpos + licoef[gi[1]]; /* y */ |
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f = wallpos*(wallpos*sqcoef[gw] + licoef[gw]) + cnst; |
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for (i = 0; i < 2; i++) { |
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if (i) { /* swap x and y coefficients */ |
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double t; |
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t = a; a = c; c = t; |
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t = d; d = e; e = t; |
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} |
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nex = 0; /* check global extrema */ |
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n = quadratic(root, a*(4.*a*c-b*b), 2.*a*(2.*c*d-b*e), |
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d*(c*d-b*e) + f*b*b); |
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while (n-- > 0) { |
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if (gc->w>>1 == gi[i] && |
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(gc->w&1) ^ (root[n] < gp[gc->w>>1])) { |
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if (gc->w&1) |
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gcl->gmin[i] = -FHUGE; |
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else |
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gcl->gmax[i] = FHUGE; |
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nex++; |
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continue; /* hyperbolic */ |
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} |
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if (tight) { |
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yex = (-2.*a*root[n] - d)/b; |
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if (yex < gcl->gc.i[1-i] || |
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yex > gcl->gc.i[1-i]+1) |
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continue; /* outside cell */ |
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} |
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if (root[n] < gcl->gmin[i]) |
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gcl->gmin[i] = root[n]; |
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if (root[n] > gcl->gmax[i]) |
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gcl->gmax[i] = root[n]; |
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nex++; |
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} |
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/* check local extrema */ |
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for (j = nex < 2 ? 2 : 0; j--; ) { |
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yex = gcl->gc.i[1-i] + j; |
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n = quadratic(root, a, b*yex+d, yex*(yex*c+e)+f); |
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while (n-- > 0) { |
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if (gc->w>>1 == gi[i] && |
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(gc->w&1) ^ (root[n] < gp[gc->w>>1])) |
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continue; |
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if (root[n] < gcl->gmin[i]) |
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gcl->gmin[i] = root[n]; |
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if (root[n] > gcl->gmax[i]) |
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gcl->gmax[i] = root[n]; |
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} |
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} |
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} |
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} |
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|
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|
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static int |
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clipeyelim( /* clip eye limits to grid cell */ |
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short rrng[2][2], |
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struct gclim *gcl |
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) |
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{ |
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int incell = 1; |
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int i; |
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|
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for (i = 0; i < 2; i++) { |
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if (gcl->gmin[i] < gcl->gc.i[i]) |
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gcl->gmin[i] = gcl->gc.i[i]; |
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if (gcl->gmax[i] > gcl->gc.i[i]+1) |
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gcl->gmax[i] = gcl->gc.i[i]+1; |
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if (gcl->gmax[i] > gcl->gmin[i]) { |
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rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) + |
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(1.-FTINY); |
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rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) + |
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(1.-FTINY) - rrng[i][0]; |
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} else |
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rrng[i][0] = rrng[i][1] = 0; |
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incell &= rrng[i][1] > 0; |
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} |
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return(incell); |
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} |
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|
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|
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void |
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packrays( /* pack ray origins and directions */ |
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float *rod, |
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PACKET *p |
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) |
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{ |
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> |
#if 0 |
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> |
double dist2sum = 0.; |
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FVECT vt; |
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> |
#endif |
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int nretries = p->nr + 2; |
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struct gclim eyelim; |
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> |
short rrng0[2][2], rrng1[2][2]; |
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int useyelim; |
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GCOORD gc[2]; |
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< |
int ila[4], offset; |
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< |
double d, sl[4]; |
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< |
register int i, j, k; |
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> |
FVECT ro, rd; |
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> |
double d; |
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> |
int i; |
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|
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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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< |
/* uniqueness hash */ |
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< |
if ((bp = hdgetbeam(hdlist[p->hd], p->bi)) != NULL) { |
| 207 |
< |
if (2*bp->nrm > nmh) { |
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< |
if (nmh) free((char *)mhtab); |
| 209 |
< |
nmh = 2*bp->nrm + 1; |
| 210 |
< |
mhtab = (int *)malloc(nmh*sizeof(int)); |
| 211 |
< |
if (mhtab == NULL) |
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< |
error(SYSTEM, "out of memory in packrays"); |
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< |
} |
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< |
for (k = nmh; k--; ) |
| 41 |
< |
mhtab[k] = -1; |
| 42 |
< |
for (i = bp->nrm; i--; ) { |
| 43 |
< |
ila[0] = hdbray(bp)[i].r[0][0]; |
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< |
ila[1] = hdbray(bp)[i].r[0][1]; |
| 45 |
< |
ila[2] = hdbray(bp)[i].r[1][0]; |
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< |
ila[3] = hdbray(bp)[i].r[1][1]; |
| 47 |
< |
for (k = ilhash(ila,4); mhtab[k%nmh] >= 0; k++) |
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< |
; |
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< |
mhtab[k%nmh] = i; |
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< |
} |
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> |
if ((useyelim = myeye.rng > FTINY)) { |
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> |
initeyelim(&eyelim, hdlist[p->hd], gc); |
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> |
groweyelim(&eyelim, gc+1, 0., 0., 0); |
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> |
groweyelim(&eyelim, gc+1, 1., 1., 0); |
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> |
useyelim = clipeyelim(rrng0, &eyelim); |
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> |
#ifdef DEBUG |
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> |
if (!useyelim) |
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error(WARNING, "no eye overlap in packrays"); |
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> |
#endif |
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} |
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/* init each ray */ |
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ila[0] = p->hd; ila[1] = p->bi; |
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offset = ilhash(ila,2) + p->nc; |
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for (i = 0; i < p->nr; i++) { |
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< |
do { /* next unique ray */ |
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< |
multisamp(sl, 4, urand(offset+i)); |
| 218 |
< |
p->ra[i].r[0][0] = ila[0] = sl[0] * 256.; |
| 219 |
< |
p->ra[i].r[0][1] = ila[1] = sl[1] * 256.; |
| 220 |
< |
p->ra[i].r[1][0] = ila[2] = sl[2] * 256.; |
| 221 |
< |
p->ra[i].r[1][1] = ila[3] = sl[3] * 256.; |
| 222 |
< |
if (bp == NULL) |
| 223 |
< |
break; |
| 224 |
< |
for (k = ilhash(ila,4); (j = mhtab[k%nmh]) >= 0; k++) |
| 225 |
< |
if (hdbray(bp)[j].r[0][0] == |
| 226 |
< |
p->ra[i].r[0][0] && |
| 227 |
< |
hdbray(bp)[j].r[0][1] == |
| 228 |
< |
p->ra[i].r[0][1] && |
| 229 |
< |
hdbray(bp)[j].r[1][0] == |
| 230 |
< |
p->ra[i].r[1][0] && |
| 231 |
< |
hdbray(bp)[j].r[1][1] == |
| 232 |
< |
p->ra[i].r[1][1]) { |
| 233 |
< |
offset += bp->nrm - j; |
| 234 |
< |
break; |
| 235 |
< |
} |
| 236 |
< |
} while (j >= 0); |
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> |
retry: |
| 217 |
> |
if (useyelim) { |
| 218 |
> |
initeyelim(&eyelim, NULL, gc+1); |
| 219 |
> |
p->ra[i].r[0][0] = irandom(rrng0[0][1]) + rrng0[0][0]; |
| 220 |
> |
p->ra[i].r[0][1] = irandom(rrng0[1][1]) + rrng0[1][0]; |
| 221 |
> |
groweyelim(&eyelim, gc, |
| 222 |
> |
(1./256.)*(p->ra[i].r[0][0]+.5), |
| 223 |
> |
(1./256.)*(p->ra[i].r[0][1]+.5), 1); |
| 224 |
> |
if (!clipeyelim(rrng1, &eyelim)) { |
| 225 |
> |
useyelim = nretries-- > 0; |
| 226 |
> |
#ifdef DEBUG |
| 227 |
> |
if (!useyelim) |
| 228 |
> |
error(WARNING, |
| 229 |
> |
"exceeded retry limit in packrays"); |
| 230 |
> |
#endif |
| 231 |
> |
goto retry; |
| 232 |
> |
} |
| 233 |
> |
p->ra[i].r[1][0] = irandom(rrng1[0][1]) + rrng1[0][0]; |
| 234 |
> |
p->ra[i].r[1][1] = irandom(rrng1[1][1]) + rrng1[1][0]; |
| 235 |
> |
} else { |
| 236 |
> |
p->ra[i].r[0][0] = random() & 0xff; |
| 237 |
> |
p->ra[i].r[0][1] = random() & 0xff; |
| 238 |
> |
p->ra[i].r[1][0] = random() & 0xff; |
| 239 |
> |
p->ra[i].r[1][1] = random() & 0xff; |
| 240 |
> |
} |
| 241 |
|
d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r); |
| 242 |
< |
if (!vdef(OBSTRUCTIONS)) |
| 243 |
< |
d *= frandom(); /* random offset */ |
| 242 |
> |
#if 0 |
| 243 |
> |
VSUM(vt, ro, rd, d); |
| 244 |
> |
dist2sum += dist2line(myeye.vpt, ro, vt); |
| 245 |
> |
#endif |
| 246 |
|
if (p->offset != NULL) { |
| 247 |
+ |
if (!vdef(OBSTRUCTIONS)) |
| 248 |
+ |
d *= frandom(); /* random offset */ |
| 249 |
|
VSUM(ro, ro, rd, d); /* advance ray */ |
| 250 |
|
p->offset[i] = d; |
| 251 |
|
} |
| 254 |
|
VCOPY(rod, rd); |
| 255 |
|
rod += 3; |
| 256 |
|
} |
| 257 |
+ |
#if 0 |
| 258 |
+ |
fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr), |
| 259 |
+ |
p->nr + 2 - nretries); |
| 260 |
+ |
#endif |
| 261 |
|
} |
| 262 |
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|
| 263 |
|
|
| 264 |
< |
donerays(p, rvl) /* encode finished ray computations */ |
| 265 |
< |
register PACKET *p; |
| 266 |
< |
register float *rvl; |
| 264 |
> |
void |
| 265 |
> |
donerays( /* encode finished ray computations */ |
| 266 |
> |
PACKET *p, |
| 267 |
> |
float *rvl |
| 268 |
> |
) |
| 269 |
|
{ |
| 270 |
|
double d; |
| 271 |
< |
register int i; |
| 271 |
> |
int i; |
| 272 |
|
|
| 273 |
|
for (i = 0; i < p->nr; i++) { |
| 274 |
|
setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]); |
| 283 |
|
|
| 284 |
|
|
| 285 |
|
int |
| 286 |
< |
done_rtrace() /* clean up and close rtrace calculation */ |
| 286 |
> |
done_rtrace(void) /* clean up and close rtrace calculation */ |
| 287 |
|
{ |
| 288 |
|
int status; |
| 289 |
|
/* already closed? */ |
| 290 |
|
if (!nprocs) |
| 291 |
< |
return; |
| 291 |
> |
return(0); |
| 292 |
|
/* flush beam queue */ |
| 293 |
|
done_packets(flush_queue()); |
| 294 |
|
/* sync holodeck */ |
| 304 |
|
} |
| 305 |
|
|
| 306 |
|
|
| 307 |
< |
new_rtrace() /* restart rtrace calculation */ |
| 307 |
> |
void |
| 308 |
> |
new_rtrace(void) /* restart rtrace calculation */ |
| 309 |
|
{ |
| 310 |
|
char combuf[128]; |
| 311 |
|
|
| 329 |
|
} |
| 330 |
|
|
| 331 |
|
|
| 332 |
< |
getradfile() /* run rad and get needed variables */ |
| 332 |
> |
int |
| 333 |
> |
getradfile(void) /* run rad and get needed variables */ |
| 334 |
|
{ |
| 335 |
|
static short mvar[] = {OCTREE,EYESEP,-1}; |
| 336 |
|
static char tf1[] = TEMPLATE; |
| 337 |
|
char tf2[64]; |
| 338 |
|
char combuf[256]; |
| 339 |
< |
char *pippt; |
| 340 |
< |
register int i; |
| 341 |
< |
register char *cp; |
| 339 |
> |
char *pippt = NULL; |
| 340 |
> |
int i; |
| 341 |
> |
char *cp; |
| 342 |
|
/* check if rad file specified */ |
| 343 |
|
if (!vdef(RIF)) |
| 344 |
|
return(0); |
| 361 |
|
pippt = NULL; |
| 362 |
|
} |
| 363 |
|
if (pippt != NULL) |
| 364 |
< |
strcpy(pippt, "> /dev/null"); /* nothing to match */ |
| 364 |
> |
strcpy(pippt, "> " NULL_DEVICE); /* nothing to match */ |
| 365 |
|
else |
| 366 |
|
sprintf(cp, ")[ \t]*=' > %s", tf2); |
| 367 |
|
#ifdef DEBUG |
| 372 |
|
loadvars(tf2); /* load variables */ |
| 373 |
|
unlink(tf2); |
| 374 |
|
} |
| 375 |
< |
rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */ |
| 375 |
> |
/* get rtrace options */ |
| 376 |
> |
rtargc += wordfile(rtargv+rtargc, MAXRTARGC-rtargc, tf1); |
| 377 |
|
unlink(tf1); /* clean up */ |
| 378 |
|
return(1); |
| 379 |
|
} |
| 380 |
|
|
| 381 |
|
|
| 382 |
< |
report(t) /* report progress so far */ |
| 383 |
< |
time_t t; |
| 382 |
> |
void |
| 383 |
> |
report( /* report progress so far */ |
| 384 |
> |
time_t t |
| 385 |
> |
) |
| 386 |
|
{ |
| 387 |
|
static time_t seconds2go = 1000000; |
| 388 |
|
|
