Is it possibel to compute normal distance from STL surface to point cloud away from STL

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As shown in the figure, I want to compute the normal distance from the STL surface to a given set of points.

stl_to_pts_norm_dist
stl_to_pts_norm_dist1277×794 15.2 KB

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yes it’s possible. Use a vtkCellLocator (or vtkStaticCellLocator which is faster) and use one of the FindClosestPoint methods.

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Thanks for the quick reply! I will check it out.