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Pull function problem

6 REPLIES 6
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Message 1 of 7
jmao30
516 Views, 6 Replies

Pull function problem

Hey guys

I'm new in Fusion 360. I just use 3D scanner scanned a prototype part, and its need be reversed to be edit. as the picture shows.1.PNG

I used Pull function to pull a Tspline cylinder on the the mesh. However, it give me this.2.PNG

the blue circled part should be curve more. I tried to add more edges, but it doesn't help.

Anyone knows how to model this part? obj file is in attachment. I'm waiting online for answers.

BTW, fusion 360 is so amazing!

Tags (3)
6 REPLIES 6
Message 2 of 7
innovatenate
in reply to: jmao30

Could you upload the OBJ file? I didn't see it in the attachments!

 

Thanks,

 

 




Nathan Chandler
Principal Specialist
Message 3 of 7
jmao30
in reply to: innovatenate

Oops. Forget to attach it.

Smiley Tongue

Message 4 of 7
innovatenate
in reply to: jmao30

One thing you may consider trying is..

In Meshmixer, you can reduce the mesh so you can automatically convert the OBJ into a sculpt body.

 

www.Meshmixer.com

 

To do this, 

  1. Import your OBJ into Autodesk Meshmixer.
  2. Use CTRL + A or Command + A to select all.
  3. From the Edit menu, use the Reduce command to reduce the number of vertices and triangles in the mesh.

Ideally you would have under 1000 triangles, something like below.

 

reduced mesh.PNG

 

Next, insert  this body into Fusion 360 right click on the body and use the convert command. This will automatically convert the Mesh body into a Sculpt (T-Splines) body. I have to warn you that the convert process may require a bit of memory and processing power.

 

When it is done you will have a sculpt body in a shape that is pretty close to the scan data. You may insert the real scan data and compare. I've attached a sample file.

 

You may also use a really rough mesh to do the conversion, but use the pull command in Fusion 360 after the conversion.

 

 

 

Another way you may consider going is to start with a plane with only a few faces. Use the pull command to snap the plane to the mesh body. Then use the Edit Form command while holding down the ALT key to add "material" to the plane. Hint, double selecting an edge will loop select the edge so that you can add material along an entire edge at one time.

 

Next, use the pull command again, rinse and repeat until you have the surface of interest covered. This will insure that the pull command doesn't snap the vertices in a seemingly random fashion and give you a little more control during the pull command.

 

If you have any questions about the second suggestion, please let me know.

 

I hope this helps.

 

Thanks,

 

 

 

 




Nathan Chandler
Principal Specialist
Message 5 of 7
deyop
in reply to: innovatenate

One thing to keep in mind when using the pull command is the limitation of how the pull is accomplished.  When the command executes it finds the closest point to any of the selected T-Spline vertices.  This means in cases like the one you are trying to execute on that the closest points down in the valleys will likely not be found as a closest point unless the T-Spline is formed to the area first.  In many situations where the target is all positive curvature this doesn't cause as much problem but with the example you shared the closest point calculation doesn't "see" anything down in the bottom of those valleys.  To improve the results you would need to preform the T-Spline shape to get closer to the eventual pull target.  You can do this with a less detailed T-Spline and as you get closer you can use the Subdivide command to get a higher resolution model for pulling.  

 

In the future we hope to provide a method that would allow us to start with the mesh model and convert to four sided facets which could be used for T-Spline surfaces or BRep faces.  This is not too far in the future and I know it will help a great deal when working with scanned date.

 

What do you hope to do with the results?  If you don't need downstream modeling functionality then you can use Meshmixer to 3D print the object.

Message 6 of 7
jmao30
in reply to: innovatenate

Thank you! your first method works great for me. I used Rhino to reduce mesh to around 1000 triangel, then use just use the convert function to change the mesh to tspline. For this part, your second suggestion did not work well for me. it take too long time, and crash my computer sometimes.

Message 7 of 7
jmao30
in reply to: deyop

Thank you for the explain. I see how it works now.

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