Obi softbody catching on the edge of collider

[josemendez]

Thanks again. The plan is that I will have three ballons in same solver so they can interact with each other.
Will they collide together from three different solvers, but different phase?

Actors from different solvers can't interact. Each solver is its own "world", so to speak. Quote from the manual:
http://obi.virtualmethodstudio.com/tutor...olver.html

Each solver is completely independent from other solvers. Therefore, actors being updated by different solver won't interact / collide with each other. Only actors in the same solver will react to each other.

If not, I guess the only path here is to solve this in shader

That's a good idea. You could just inflate vertices along their normal. However this won't affect physics, so it's only viable if the inflation is merely visual feedback.