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87 lines
2.9 KiB
87 lines
2.9 KiB
%--------------------------
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% @Author: Jingqiao Hu
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% @Date: 2022-01-13 00:10:54
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% @LastEditTime: 2022-01-18 19:53:15
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%--------------------------
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function seeds = quadtree_nonregular(rho, cpnts, maxx, minx, maxy, miny, maxz, minz, microx, eps)
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% 2. compute faces-center points & rho
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% 3. divide into block with min-size/10
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% while any block>min-size:
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% divide the into 4
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min_size = microx / 2;
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max_size = microx / 1;
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%% bounding box and divide into block with max-size
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decomp_info = [];
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for i = minx : max_size : maxx-max_size
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x = [i, i + max_size];
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for j = miny : max_size : maxy-max_size
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y = [j, j + max_size];
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for k = minz : max_size : maxz-max_size
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z = [k, k + max_size];
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[idx, ~] = find(cpnts(:, 1) <= x(2) & cpnts(:, 1) >= x(1) & ...
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cpnts(:, 2) <= y(2) & cpnts(:, 2) >= y(1) & ...
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cpnts(:, 3) <= z(2) & cpnts(:, 3) >= z(1));
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if ~isempty(idx)
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rho_info = mean(rho(idx));
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decomp_info = [decomp_info; [rho_info, i,j,k, max_size]];
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end
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end
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end
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end
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%% quadtree
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flag = 1;
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while (any(decomp_info(:,1) > eps) || any(decomp_info(:,4) > min_size)) && flag
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flag = 0;
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[r, ~] = find(decomp_info(:,1) > eps);
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for ri = 1:length(r)
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di = decomp_info(r(ri), :);
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cur_size = di(end);
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if cur_size > min_size
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flag = 1;
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step = cur_size / 2;
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decomp_info(r(ri), 1) = -1;
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for i = di(2) : step : di(2) + cur_size - step
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x = [i, i+step];
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for j = di(3) : step : di(3) + cur_size - step
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y = [j, j+step];
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for k = di(4) : step : di(4) + cur_size - step
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z = [k, k+step];
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[idx, ~] = find(cpnts(:, 1) <= x(2) & cpnts(:, 1) >= x(1) & ...
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cpnts(:, 2) <= y(2) & cpnts(:, 2) >= y(1) & ...
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cpnts(:, 3) <= z(2) & cpnts(:, 3) >= z(1));
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if ~isempty(idx)
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rho_info = mean(rho(idx));
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decomp_info = [decomp_info; [rho_info, i,j,k, step]];
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end
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end
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end
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end
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end
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end
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end
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decomp_info = decomp_info(decomp_info(:,1)>0,:);
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step = decomp_info(:,end)/2;
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seeds = [decomp_info(:,2) + step, decomp_info(:,3) + step, decomp_info(:,4) + step];
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% figure; scatter3(seeds(:,1), seeds(:,2), seeds(:,3), 'filled'); axis equal;
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% view([10 25]);
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% xlabel('x axis');
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% ylabel('y axis');
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% zlabel('z axis');
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end
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