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资源说明：选择三维点云的点，返回坐标：
H = CLICKA3DPOINT(POINTCLOUD) shows a 3D point cloud and lets the user
% select points by clicking on them. The selected point is highlighted
% and its index in the point cloud will is printed on the screen.
% POINTCLOUD should be a 3*N matrix, represending N 3D points.
% Handle to the figure is returned.
%
% other functions required:
% CALLBACKCLICK3DPOINT mouse click callback function
% ROWNORM returns norms of each row of a matrix
%
% To test this function ...
% pointCloud = rand(3,100)*100;
% h = clickA3DPoint(pointCloud);
%
% now rotate or move the point cloud and try it again.
% (on the figure View menu, turn the Camera Toolbar on, ...)
%
% To turn off the callback ...
% set(h, 'WindowButtonDownFcn','');
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