Revolve ellipse leaves profile behind

[LMD001]

Hello Fusion 360 Team,

When Revolving an ellipse the ellipse profile stays visible, with a circle or a square this does not happen.

Thanks for looking at this.

Best regards,

Ludo

[jeff_strater · Accepted solution]

Hi Ludo,

Yes, this is true.  It's not really the profile that you are seeing, but a model edge that the modeler has inserted.  I can check with the modeling team to be sure, but I think that what is going on here is that our modeling kernel does not have a simple representation for this kind of surface.  So, a revolved circle is a torus, and a revolved rectangle is a collection of  either planes or cylindrical faces, but there is no simple mathematical representation for a closed, revolved ellipse.  So, my guess is that the modeler defaults this surface to a periodic spline surface.  For reasons that are way over my head, mathematically, a periodic spline surface needs a break in it.  You will see the same thing if you revolve a spline profile.

Hope this helps explain what you are seeing.

Jeff Strater (Fusion development)

[Davidf01]

I know you may have checked this but make sure the sketch light bulb is not selected in the browser. This will show the sketch all the time no matter what.

[LMD001 · Accepted solution]

Hello Jeff,

Thanks for the explanation. I just love mathematics! 

@Davidf01 You are correct in pointing out the sketch "on" or "off" button, this can indeed be easily overlooked, but normally, when a sketch is consumed, Fusion 360 will turn the sketch "off".

Best regards,

Ludo

[Anonymous]

I get why Fusion 360 puts the edge there but is there any way to just hide that single edge?