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To make 3D model with point cloud

Question asked by Sajilal Nair on Jun 10, 2020
Latest reply on Jun 15, 2020 by Matt Juric

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Hello guys, I'm trying to reconstruct a 3D model from a point cloud data which is a text file. when I try to open it with mesh prep wizard it creates a bunch of little pieces rather than creating complete geometry by joining all the points.

I tried the regular method, first enabling "Scan to 3D" add-in later using the "Mesh prep wizard" command. But I'm unable to get the actual geometry.

Is there a special procedure to follow?

Below is the snapshot of the point cloud, Geometry obtained, and Geometry supposed to get (approximate)

Any help is much appreciated!

Thanks in advance

mesh_prep_wizard point cloud 3d models topography

Geometry expected to get (approximate)

Matt Juric Jun 11, 2020 5:40 PM

Correct Answer

You could draw a spline through all the know sections and then set up some guides and do a loft.

Since it looks like you have three tubes you'll probably have to do each tube and then surface model the "Y" connector section.

See the reply in context

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Imported pointcloud data.SLDPRT.zip38.5 KB
Pointcloud data.txt.zip4.2 KB

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Mark Biasotti Jun 10, 2020 5:46 PM

Hello Sajilal,

There simply isn't enough information between sections to derive something that is close enough proximity to scanned sections. You need more sections and a higher density of point cloud per slice. Attached is the best that can be done with the limited Point Cloud Data. The curves were extracted using the Scanto3D curve wizard and then Boundary surfaces created on top of those curves.

Attachments

Part2-mab.SLDPRT.zip3.0 MB

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Sajilal Nair @ Mark Biasotti on Jun 10, 2020 11:23 PM

Hello Mark,

Thank you for your time and response.

Yes, I agree that the density of point cloud per slice is less and it has only the outer boundaries. However, is there a way to connect these outer points and create a hollow structure (single piece)?

Because this is a point cloud data of artery (Carotid artery bifurcation), could you please guide me on how to make this as a hollow structure. Because after the reconstruction of this structure, I need to perform a flow simulation through it using other software packages.

Thank you

Saji

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Matt Juric @ Sajilal Nair on Jun 11, 2020 5:40 PM

You could draw a spline through all the know sections and then set up some guides and do a loft.

Since it looks like you have three tubes you'll probably have to do each tube and then surface model the "Y" connector section.

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Sajilal Nair @ Matt Juric on Jun 13, 2020 2:06 PM

Hello Matt,

It worked!! Thank you so much for your advice. Much appreciated !!

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Matt Juric @ Sajilal Nair on Jun 15, 2020 8:38 AM

Great, I'm glad it worked for you. I did way more reverse engineering of parts using a manual CMM before we had the fancy laser heads that created massive point clouds. That's how I did it on odd shapes. The worst part is getting all the points in the same plane. But once you do that it works pretty well.

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5 Replies

Mark Biasotti Jun 10, 2020 5:46 PM
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Correct Answer
Hello Sajilal,

There simply isn't enough information between sections to derive something that is close enough proximity to scanned sections. You need more sections and a higher density of point cloud per slice. Attached is the best that can be done with the limited Point Cloud Data. The curves were extracted using the Scanto3D curve wizard and then Boundary surfaces created on top of those curves.
Attachments
- Part2-mab.SLDPRT.zip3.0 MB
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- Sajilal Nair @ Mark Biasotti on Jun 10, 2020 11:23 PM
  Mark Correct
  Correct Answer
  Hello Mark,
  Thank you for your time and response.
  
  Yes, I agree that the density of point cloud per slice is less and it has only the outer boundaries. However, is there a way to connect these outer points and create a hollow structure (single piece)?
  
  Because this is a point cloud data of artery (Carotid artery bifurcation), could you please guide me on how to make this as a hollow structure. Because after the reconstruction of this structure, I need to perform a flow simulation through it using other software packages.
  
  Thank you
  Saji
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  - Matt Juric @ Sajilal Nair on Jun 11, 2020 5:40 PM
    Unmark Correct
    Correct Answer
    You could draw a spline through all the know sections and then set up some guides and do a loft.
    
    Since it looks like you have three tubes you'll probably have to do each tube and then surface model the "Y" connector section.
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    - Sajilal Nair @ Matt Juric on Jun 13, 2020 2:06 PM
      Mark Correct
      Correct Answer
      Hello Matt,
      
      It worked!! Thank you so much for your advice. Much appreciated !!
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      - Matt Juric @ Sajilal Nair on Jun 15, 2020 8:38 AM
        Mark Correct
        Correct Answer
        Great, I'm glad it worked for you. I did way more reverse engineering of parts using a manual CMM before we had the fancy laser heads that created massive point clouds. That's how I did it on odd shapes. The worst part is getting all the points in the same plane. But once you do that it works pretty well.
        Like • Show 0 Likes0
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To make 3D model with point cloud

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