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#include "bsdfrep.h" |
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#ifndef MINRSCA |
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#define MINRSCA 0.15 /* minimum radius scaling factor */ |
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#define MINRSCA 1.0 /* minimum radius scaling factor */ |
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#endif |
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#ifndef MAXRSCA |
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#define MAXRSCA 2.7 /* maximum radius scaling factor */ |
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#endif |
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#ifndef VARTHRESH |
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#define VARTHRESH 0.0015 /* culling variance threshold */ |
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#endif |
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#ifndef DIFFMAX2 |
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#define DIFFMAX2 (16.*VARTHRESH) /* maximum ignored sample variance */ |
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#endif |
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#ifndef MAXFRAC |
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#define MAXFRAC 0.5 /* maximum contribution to neighbor */ |
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#endif |
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double ang2, lastang2; |
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int r, i, j, jn, ii, jj, inear, jnear; |
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for (i = 0; i < GRIDRES; i++) /* initialize minimum radii */ |
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for (j = 0; j < GRIDRES; j++) |
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if (dsf_grid[i][j].nval) |
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dsf_grid[i][j].crad = cradmin; |
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|
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r = GRIDRES/2; /* proceed in zig-zag */ |
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for (i = 0; i < GRIDRES; i++) |
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for (jn = 0; jn < GRIDRES; jn++) { |
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/* next search radius */ |
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r = ang2*(2.*GRIDRES/M_PI) + 3; |
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} |
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for (i = 0; i < GRIDRES; i++) /* grow radii where uniform */ |
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for (j = 0; j < GRIDRES; j++) { |
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double midmean = 0.0; |
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int nsum = 0; |
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if (!dsf_grid[i][j].nval) |
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continue; |
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r = 1; /* avg. immediate neighbors */ |
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for (ii = i-r; ii <= i+r; ii++) { |
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if (ii < 0) continue; |
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if (ii >= GRIDRES) break; |
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for (jj = j-r; jj <= j+r; jj++) { |
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if (jj < 0) continue; |
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if (jj >= GRIDRES) break; |
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midmean += dsf_grid[ii][jj].vsum; |
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nsum += dsf_grid[ii][jj].nval; |
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} |
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} |
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midmean /= (double)nsum; |
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while (++r < GRIDRES) { /* attempt to grow perimeter */ |
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double diff2sum = 0.0; |
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nsum = 0; |
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for (ii = i-r; ii <= i+r; ii++) { |
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int jstep = 1; |
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if (ii < 0) continue; |
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if (ii >= GRIDRES) break; |
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if ((i-r < ii) & (ii < i+r)) |
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jstep = r<<1; |
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for (jj = j-r; jj <= j+r; jj += jstep) { |
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double d2; |
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if (jj < 0) continue; |
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if (jj >= GRIDRES) break; |
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if (!dsf_grid[ii][jj].nval) |
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continue; |
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d2 = midmean - dsf_grid[ii][jj].vsum / |
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(double)dsf_grid[ii][jj].nval; |
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d2 *= d2; |
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if (d2 > DIFFMAX2*midmean*midmean) |
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goto escape; |
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diff2sum += d2; |
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++nsum; |
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} |
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} |
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if (diff2sum > VARTHRESH*midmean*midmean*(double)nsum) |
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break; |
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} |
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escape: --r; |
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r = ANG2R(r*(M_PI/MAXRSCA/GRIDRES)); |
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if (r < cradmin) |
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r = cradmin; |
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if (dsf_grid[i][j].crad < r) |
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dsf_grid[i][j].crad = r; |
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} |
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/* blur radii over hemisphere */ |
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memset(fill_grid, 0, sizeof(fill_grid)); |
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memset(fill_cnt, 0, sizeof(fill_cnt)); |
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dsf_grid[i][j].crad = fill_grid[i][j]/fill_cnt[i][j]; |
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} |
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/* Radius comparison for qsort() */ |
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static int |
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radius_cmp(const void *p1, const void *p2) |
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{ |
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return( (int)dsf_grid[0][*(const int *)p1].crad - |
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(int)dsf_grid[0][*(const int *)p2].crad ); |
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} |
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|
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/* Cull points for more uniform distribution, leave all nval 0 or 1 */ |
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static void |
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cull_values(void) |
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{ |
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int indx[GRIDRES*GRIDRES]; |
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FVECT ovec0, ovec1; |
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double maxang, maxang2; |
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int i, j, ii, jj, r; |
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int i, j, k, ii, jj, r; |
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/* sort by radius first */ |
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for (k = GRIDRES*GRIDRES; k--; ) |
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indx[k] = k; |
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qsort(indx, GRIDRES*GRIDRES, sizeof(int), &radius_cmp); |
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/* simple greedy algorithm */ |
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for (i = 0; i < GRIDRES; i++) |
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for (j = 0; j < GRIDRES; j++) { |
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for (k = GRIDRES*GRIDRES; k--; ) { |
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i = indx[k]/GRIDRES; /* from biggest radius down */ |
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j = indx[k] - i*GRIDRES; |
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if (!dsf_grid[i][j].nval) |
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continue; |
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if (!dsf_grid[i][j].crad) |
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continue; /* shouldn't happen */ |
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break; /* shouldn't happen */ |
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ovec_from_pos(ovec0, i, j); |
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maxang = 2.*R2ANG(dsf_grid[i][j].crad); |
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if (maxang > ovec0[2]) /* clamp near horizon */ |
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maxang = ovec0[2]; |
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/* clamp near horizon */ |
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if (maxang > output_orient*ovec0[2]) |
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maxang = output_orient*ovec0[2]; |
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r = maxang*(2.*GRIDRES/M_PI) + 1; |
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maxang2 = maxang*maxang; |
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for (ii = i-r; ii <= i+r; ii++) { |
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dsf_grid[ii][jj].nval = 0; |
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} |
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} |
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} |
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} |
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/* final averaging pass */ |
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for (i = 0; i < GRIDRES; i++) |
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for (j = 0; j < GRIDRES; j++) |
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} |
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} |
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< |
/* Compute minimum BSDF from histogram and clear it */ |
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> |
/* Compute minimum BSDF from histogram (does not clear) */ |
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static void |
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comp_bsdf_min() |
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{ |
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for (i = 0; cnt <= target; i++) |
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cnt += bsdf_hist[i]; |
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bsdf_min = histval(i-1); |
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memset(bsdf_hist, 0, sizeof(bsdf_hist)); |
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} |
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/* Find n nearest sub-sampled neighbors to the given grid position */ |