FILL: Merge With All vs. Merge Scope

Argo

As this is my first community question, would like to start by saying: THANK YOU Onshape! I use CAD for hobbying/make and have come across from Sketchup (please don't judge me! )

Also, Happy New Year!!

I have been learning by creating a tubular mitre/web. For far too long I could not figure out why I was unable to convert the resultant surfaces (from extrusions, bridging curve, etc) into a solid. By 'clicking all the buttons' I have got the job done. However, this now begs the question: what is the difference between Fill: Merge With All, &, Fill: Merge Scope? Sorry if this is obvious, but can anyone explain why one operation works and the other doesn't? Here are screenshots ("Surface3" is all the manifold geometry you can see) :

Fails with error: "Cannot add surface with existing geometry"
 


Works:

NeilCooke

Are there any surfaces that are hidden perhaps? It may be trying to merge with them also. 

Also, why are you doing this in surfaces? 😉

NeilCooke

Are there any surfaces that are hidden perhaps? It may be trying to merge with them also. 

Also, why are you doing this in surfaces? 😉

Argo

That's the answer, thanks Neil Hidden surfaces it makes no sense to merge with - exactly!
Because Fill (Add) defaults to 'Merge With All', I (foolishly) assumed OS would wave its magic wand and ignore non-logical entities in the Merge 

Er, going to show my newbieness and ask why not Surfaces? My goal was to change the surface  into a solid, which OS did perfectly. I suppose I could have used Enclose? Or am I overlooking a fundamental?

NeilCooke

You could probably sweep the triangle as a solid and add the corner piece on after. Maybe 6 features in total?

steve_shubin

@Argo

The GIF below shows the solid modeling method that Neil is talking about.

owen_sparks

Great presentation @steve_shubin
Owen.

steve_shubin

@owen_sparks

Thanks Owen

I’ve got a video editor for my iPhone called LumaFusion. It’s fast & easy to use. It’s my second favorite app - right behind Onshape

Argo

Many thanks to both of you, I get it now 

I agree with you Owen, Steve's GIF was very useful.

john_mcclary

@steve_shubin Nice

steve_shubin

@john_mcclary

Thanks John