Particle penetration using Bender et al boundary handling method

[Clairezsh]

Hi, I' m trying to integrate Bender et al boundary handling method in my system.

I do same as how it implemented in SPlisHSPlasH library, but the results didn't look great, which the particles
all penetrated the boundary and seems don't under the constraint of the boundary.

I'd be appretiate so much if you have any ideas about what the problem might be!
And I also want to know how to make sure that I have implemented this method properly in my code?

Thanks a lottttt!