How to slice a point cloud along z axis

Question

stefano chiappini 2022-3-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1665934-how-to-slice-a-point-cloud-along-z-axis

编辑： Chen Xinzhuo 2023-2-8

example crown1.zip

Hi, i got the following question:

i have a crown tree point cloud and i need to slice along z axis with with 10 cm thickness. Finally, i need to calculate the volume by alpha shape algorithm for each individual slice.

How to solve these problem?

Thank you so much

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Paola Donis Noriega 2022-4-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1665934-how-to-slice-a-point-cloud-along-z-axis#answer_953055

在 MATLAB Online 中打开

You can slice a point cloud along the z-axis as follows:

% Use the teapot point cloud as an example.
ptCloud = pcread('teapot.ply');
% Get the point cloud z limits.
minZ = ptCloud.ZLimits(1);
maxZ = ptCloud.ZLimits(2);
% Define the thickness of each slice.
thickness = 0.1;
% Use pcplayer to visualize the point cloud slices.
player = pcplayer(ptCloud.XLimits, ptCloud.YLimits, ptCloud.ZLimits);
% Use a for loop to select each point cloud slice.
for i = minZ:thickness:maxZ
    % Get the logical indices of the points in each slice.
    selectedIdx = ptCloud.Location(:, 3) >= i & ...
        ptCloud.Location(:, 3) < (i + thickness);
    % Select the point cloud slice using the indices.
    ptCloudSlice = select(ptCloud, selectedIdx);
    % Visualize the slice.
    view(player, ptCloudSlice)
    pause(0.2)
end