Matching or pull edge of form surface to sketch profile.

[tom9PWC3]

I am trying to create a 3d printable shoe bed.  The surface is defined by a T-spline, the closed loop outline is a sketch profile created with tangent arcs and a couple of lines.  The side wall is a constant height extruded from the same outline.  This is a long term one off for 1 person.  Lots of tweaks to the outline and individual L and R surfaces for perfect fit but no need for different sizes once this part is done.  With that said I am on prototype #6 with a day or two per of editing.  The bodies created will be used as a base feature in another set of files.

Currently I just manually adjust the edge of the form to intersect  the profile as close and smooth as possible.  I have several sketch profiles closely offset from the intended one to help with manual aiming.  This works but is very time consuming even for minor changes to the outline.  I have also tried match and pull commands with various kinds of extrusions of the sketch. Those tend to twist and loop the surface.  

Is there another work flow I should be using? Alternatively, if I can get it just close enough is there a better way to smooth out the edges?  Fillet fails or creates a very uneven edge.  Wide screen shot shown has a sweep cut to try and even things out.  I have not figured out how to smooth those cuts.

[akash.nawghare]

Hi @tom9PWC3 

To align a Form (T-Spline) edge to a sketch profile, use Match first — not Pull. Pull is meant for mesh/BRep bodies; Match is the right tool for sketch curves.

Recommended: Match (sketch profile)

1. Create your sketch profile (open or closed curve) on the correct plane.
2. Enter Form (Sculpt) and select your T-Spline body.
3. Modify → Match
4. Select the T-Spline edge loop (double-click an edge to chain-select the loop).
5. Select the sketch curve(s) as the match target.
6. In the dialog:
   • Check Associative if you want the Form edge to follow sketch edits parametrically (Associative Match)
   • Continuity: G0 (Connected) only when matching to sketches — G1/G2 need solid or surface faces
   • Adjust Tolerance if the edge doesn’t sit close enough
   • Use Alternate Alignment if the match twists or self-intersects
7. OK → Finish Form when done.

Official docs: Match T-Spline edges to sketch/solid/surface

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Thanks
Akash Nawghare
Autodesk Fusion

[johnsonshiue]

Hi! Another approach to consider is to create a surface to cut off the unwanted portion. Then use Full Round Fillet to smoothen the sharp edges. Please share the f3d file here, so that the forum experts can help take a closer look.

Many thanks!

[tom9PWC3]

Thank you, I tried it before and again this morning.  That method fails with "Match failure, multiple edge chains selected in either the T-Spline or target selections. Please try re-selecting a single edge chain."

If I only do one edge at a time the OK will not activate.  I am uploading a file in a reply below.

[tom9PWC3]

I am kind of doing that with an extrude.  A plane at the same level as the sketch will have the same problem,  as you can see in the file any variation from the sketch line creates a waviness.  Fillet makes this waviness worse.

I Think I can combine the cut sweep with a combine sweep to get the edge to look and feel better.  I still need to get the surface "close enough" and I assumed match or pull should be able to do this.

Thank you.

[tom9PWC3 · Accepted solution]

I think I have found a workable solution.  I ended up creating a sweep of the intended rim and changing the appearance to yellow.  This gives much better visual feedback than the sketch profiles.  I then added some offset curves to use as rails to snap to.  With that setup, "object snap" worked better than it was before.

The advantage is I no longer need the sweep cut feature.  The even bigger advantage is I can use a 1 in fillet to smooth the transition.

One last question, is there a key (WINDOWS) to disable Object Snap?  I am running into a problem where it snaps to the wrong line and will not release to move it to the next line.  Alt and ctrl don't work in this spot.