Rebuild curve for reverse engineering (really need CVs)

[cekuhnen]

I mentioned view times that the absence of a CV curve is really bad for better sculpintg of curves in Fusion.

But specifically for reverse engineering this feature is badly needed.

When you from a solid geometry project the profiles / edges onto a sketch and break the link you cannot modify

those curves. So the usefulness in this case is rather limited.

In Alias I can select an edge of a Step surface import and copy out the edge:

This works flawless and is very usable if the input geometry was also crafted with a clean topology in mind.

The student here ignored the adive to use less spans and more degrees but overall the form is usable.

Now if I import this shell into Fusion and do the same:

I have the curve in the sketch I break the link but cannot manipulate it at all as there are no CVs or spline hanles to work with.

Or we need a rebuild / fit curve function where Fusion can or tries to rebuild the input sketch via the spline curve.

[deyop]

We are investigating a fit curve for reverse engineering from scan data.  We could consider how this might work if the input was another curve like in your example.  It could sample the curve and then allow the user to fit a more ideal spline.  

In the case you give where an edge definition is provided as input it sounds like you want to define rebuild for the purpose of improving the curve, right?

[cekuhnen]

To copy out the edge profile of a curve is great when you want to have full control over rebuilding the design with native fusion tools. CV I think is for me preferred - a spline I might have to see. I find spline curves with more than 3 points to be extremely hard to sculpt with because of how they bend adjust. In my case it is an alias model untrimmed so I can copy out the curves 1:1 so u can rebuild it with fusion surface tools.

[cekuhnen]

another reason why I think we need CV curves besides the fact that the spline tangent handle system in the sketch is really hard to use in 3D is the fact that when I import an Alias model, I can extract the curve into a sketch and rebuild the design natively with Fusion tools but with Alias made curves!

that will reduce time a lot!

[Innovationlab_CarlosRego]

Hi Deyop,

This feature is badly needed in F360.

A long time has passed since cekuhnen posted this thread. Can you please share with us if the rebuild-fit curve and CV curve handling improvements will be added to F360 soon?

Best regards,

Carlos

[cekuhnen]

@Innovationlab_CarlosRegoYeah while we get CAM Simualtion and such great tools, the basic framework of tools like sketching and surfacing remains far behind the competition and continue to cripple the usablity of Fusion 360.

[masureb]

Do you think, we will get something similar than the fit spline than SolidWorks proposes?

[Anonymous]

The rebuild curve feature give a great benefits when we draw curve.

I note the benefits by quoting Moid3D document as below. 
"Rebuild can be used to simplify a curve that is overly complex or messy or has too many points in it to be easily manipulated by control point editing. It can also be used for the reverse as well, to add a lot more points to a simple curve if you want to have a higher level of detail available for editing. " .

Because of its benefits, Many software has the rebuild curve feature like below.

• Maya
  • https://youtu.be/uzQm9JWGyeg?t=176
• Moi3D
  • http://moi3d.com/3.0/docs/moi_command_reference10.htm#rebuild
• Rhino
  • http://docs.mcneel.com/rhino/6mac/help/en-us/commands/rebuild.htm

I hope fusion360 also will support this feature.