Extract curve from surfaces or solids

[Anonymous]

Hi there,

I'm seeking for a way, but I can't find one, to extract a curve on the top surface of this sweeped surface (please see the image and you can find the model here: https://a360.co/2RljMa3).

I would use it for a pipe or a loft or just a pattern exactly in the middle of the surface.

Can you help me, please?

Thanks

Marco

[shootquinn]

CATIA literally has a half-dozen ways to do this, one of which is literally a button called "Extract." 

http://catiadoc.free.fr/online/cfyug_C2/cfyugextract.htm

https://www.youtube.com/watch?v=VooLF2DsFlo

[TrippyLighting]

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@shootquinn wrote:

CATIA literally has a half-dozen ways to do this, one of which is literally a button called "Extract." 

http://catiadoc.free.fr/online/cfyug_C2/cfyugextract.htm

https://www.youtube.com/watch?v=VooLF2DsFlo

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CATIA, Siemens NX and Alias have many curve and surfacing tools that not available in Fusion 360.

They also have eyewatering high price points that are way beyond 99% of the general Fusion 360 user base.

[shootquinn]

Thus my issue with your first post in this thread, "You cannot simply 'extract' a curve. Depending on what application you are working with sometimes you can create iso curves on a surface..."

Also, this can be done using Fusion's "Include 3D Geometry" tool in sketch --> Project/Include:

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-extract-a-c...

From here a user can extrude a ribbon-like surface and offset the surface as you suggested.

This thread has a high google search ranking.

[TrippyLighting]

"Extracting" a curve from an edge, or form an arbitrary place on an existing NURBS surface results in an approximation of that surface at that "place" within a given tolerance, not a extraction of a original curve that might have been used to create that surface. That was what I was trying to explain in my simplified post to a novice user.

I am sure you understand that "novice" context.

Extracting a curve from an existing trimmed NURBS edge in Fusion 360 very often results in very broken curvature and is also unnecessary to create a ribbon surface, because that can be done directly from that edge.. That, on the other hand usually does NT result in broken curvature.

I have reported this many, many times to the Fusion 360 team.