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How to convert 3D cloud of points into a boundary of a solid to be used to solve the Coefficient Form PDE

Posted Feb 26, 2024, 8:12 a.m. EST Version 5.5 4 Replies

Małgorzata Jankowska
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Dear All.

I have a following problem. I have a cloud of points in a format x y z in each row of the text file.

This cloud of points represents a 3D boundary of some soild. I have to read the points, treat them as a boundary of a solid, probably convert to a solid. Then, I have to compute some BVP using: Coefficient Form PDE. My cloud of points represents a 3D boudary.

I have read the post availabe at: https://www.comsol.com/blogs/how-to-convert-point-cloud-data-to-surfaces-and-solids/ but my my situation it does not help.

I will be very grateful for your help. With best regards, Malgorzata

4 Replies Last Post Feb 26, 2024, 5:06 p.m. EST
Jeff Hiller COMSOL Employee

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Posted: 8 months ago Feb 26, 2024, 10:36 a.m. EST
Updated: 8 months ago Feb 26, 2024, 10:36 a.m. EST

Hello Malgorzata,

Can you expand on why the blog post does not help in your case?

Jeff

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Jeff Hiller
Hello Malgorzata, Can you expand on why the blog post does not help in your case? Jeff
Małgorzata Jankowska
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Posted: 8 months ago Feb 26, 2024, 4:24 p.m. EST

Dear Jeff.

Thank you very much for your quick answer. The post seems to help in a little bit different case, i.e. when we have a cloud of points that form an open surface. In my case a cloud of points looks like a kind of irregular sphere (see the picture enclosed). I tried to change some options in Comsol, but the result seems to be like a surface, not like a 3D boundary. However, you know Comsol much better.

With best regards, Malgorzata

Dear Jeff. Thank you very much for your quick answer. The post seems to help in a little bit different case, i.e. when we have a cloud of points that form an open surface. In my case a cloud of points looks like a kind of irregular sphere (see the picture enclosed). I tried to change some options in Comsol, but the result seems to be like a surface, not like a 3D boundary. However, you know Comsol much better. With best regards, Malgorzata

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Jeff Hiller COMSOL Employee

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Posted: 8 months ago Feb 26, 2024, 4:39 p.m. EST
Updated: 8 months ago Feb 26, 2024, 4:39 p.m. EST

Why not split the data into several patches that add up to the full surface?

Jeff

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Jeff Hiller
Why not split the data into several patches that add up to the full surface? Jeff
Małgorzata Jankowska
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Posted: 8 months ago Feb 26, 2024, 5:06 p.m. EST

Dear Jeff. I am afraid this boundary is rather irregular. The points are generated with some algorithm proposed by my colleague. I am not convinced how to split the data into several patches and if it is even possible. With best regards, Malgorzata

Dear Jeff. I am afraid this boundary is rather irregular. The points are generated with some algorithm proposed by my colleague. I am not convinced how to split the data into several patches and if it is even possible. With best regards, Malgorzata

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