Corner Blend vs Ball Corner

Anonymous — Tue, 20 Aug 2019 07:50:02 GMT

Hallo,

I just try to figure out the differences of the new Alias 2020 Corner Blend tool and the regular Ball Corner tool.

For Info: we generally use Bézier-Surfaces only. So maybe I dont notice all differences.

I compared:

Corner for G2-Fillets (our main purpose of the Ball Corner tool)

Corner for Circular/G1-Fillets

Corner with mixed fillets

Pros:

Corner Blend: works wihout CoS; so a little bit less preparation. works a tiny bit quicker. 4th-Edge can be G1

But Ball Corner: in Bézier much better CV-Layout. often with little preparation just perfect for G2-Corners with Explicit Control on degree 5 / spans 1 . And on G1-Corners on degree 3 / spans 1

Both Tools Cons:

with G1 or mixed, corners tend to be a bit flat in the middle. Or create odd CV-Layout when using the inbuilt algorithms to counter that flatness.

My Point 🙂

should the Corner Blend tool replace the Ball Corner tool on the long run?

Than, it would be awesome if the Corner Blend creates a CV-Layout similar to the Ball Corner (on Explicit Control at least). that would help a lot for class-a / bézier-surfacing

Cheers

David

Re: Corner Blend vs Ball Corner

BarryKimball — Wed, 21 Aug 2019 15:31:17 GMT

The ball corner and corner blend tool perform similar tasks.e. The key difference is the method used for creating the surface, Ball Corner uses what I like to refer to as hocus-pocus...simply put, complex mathematics to blend the corner. The corner Blend tool uses a specific process (approx. ten separate steps) to create the corner blends. The results of those specific steps are predictable and controllable. Corner Blend allows the user to define the specific radius created on the 4th or base surface, Ball corner creates that shape based on the input geometry and a ratio slider. Here are 3 images that show the solution for corner blend (left) and ball corner (right). In every case corner blend achieves better results in terms of continuity and CV layout. Corner Blend allows you to control the center of the blend (flatness you called it) with the edge blending sliders. I believe if you continue testing the differences between both tools you will find that the corner blend tool provides superior results in almost every case...There are a few key controls to be aware of in Corner Blend...too much to write here...I will try and create a video of what each feature does...prior to that...pay attention to the trim_convert/trimmed surface option, when trimmed fails to achieve continuity trim convert typically succeeds...also be aware that the middle edge slider allows the user to control the blend shape across the middle blend...

topic Corner Blend vs Ball Corner in Alias Forum

Corner Blend vs Ball Corner

Re: Corner Blend vs Ball Corner