How to translate 3d-scanned point clouds to .stl format

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LIN Hongbin 2016-1-23

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评论： Walter Roberson 2017-11-9

I scanned a piece with a 3D scanner,and got a set of point clouds.Now I want to triangulate the point cloud with only the patches,I don't want to triangulate the point clouds into tetrahedron,because what I want to get is the surface or the contour of the 3D-model,just like .stl format. Thank you.

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dayseeker 2017-11-6

Hello, i am working on same project, can i ask you how you create stl from point data cloud? I used Delaunay Triangulation but how to use its Connectivity List to make STL, can you please help me?

Walter Roberson 2017-11-9

dayseeker: note that LIN Hongbin was probably not notified about your question.

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Walter Roberson 2016-1-23

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Do you have R2014b or later? If so then see alphashape() and also boundary()

If not then you can find alphashape implementations in the File Exchange.

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Walter Roberson 2016-1-25

编辑：Walter Roberson 2016-1-25

It looks to me as if the stellation arose from using an inappropriate alpha value. The purpose of alpha shapes is to wrap the surface closely around the known data, and the stellated version was a closer wrap, but the amount of wrapping is determined by the alpha values.

I have not used alpha values myself; John D'Errico created an Alpha Shapes File Exchange contribution and would know far more than I would about how to use them.

But keep in mind that you originally said you had a point cloud. Your example here is hardly a point cloud.

LIN Hongbin 2016-1-26