Better surface endbulge control

Rhino
1

Hello!

Better endbulge control
Better endbulge control927×449 91.2 KB

I created the middle surface with sweep2. however the control point roll highlighted is placed too high and I want to adjust them to the style like in the red rectangle highlighted, that point should be at an “intersection point” of 2 direction straight lines.
My question is: how to adjust all these points quickly?
endbulge.3dm (128.0 KB)

Additional question: Why is this roll of point is placed that high for a tangency? Can’t this roll be lower for tangency?

2

Adding an extra section or 2 – no more than absolutely needed!-- to the sweep with BlendCrv seems to largely tame this.

EndBulge is a gimmicky command that looks cool in a sales demo but is rarely actually useful in the real world to ‘fix’ overly complicated surfaces like this, you’ll be playing endless whack-a-mole.

I would try not to build this the way you have, but if I did I would simplify the surface (by removing knots or rebuilding) until I have a VERY simple loose surface that I can tweak with a bit of point editing, then use MatchSrf to “nail down” the edges.

Otherwise I would try to rethink the topology so that I was approaching it more like this (it’s not very close because I just did something very quickly.) There’s a rule of thumb in filleting that you need to work from bigger fillets to smaller, and the same applies to more freeform shapes.

image
image1990×1282 120 KB

3

Thanks for reply
extra section can control the region nearby only, not really a full control of specific control point roll.
Yes I also played with Endbulge with no good result, time is wasted
that surface must be a tangent relationship to nearby 4 surface so that this surface will fit into an open polysurface of a wing piece. Yes this surface is from a wing piece.
Finally I really tweak each point and done with this result…very slowly and boring.
endbulge_result.3dm (84.0 KB)