remove Vellum Constraint by Collision

[Ultraman]

Hi Guys .

i create simple ball and animated ,  then convert ball to Grain and use " attach Geometry " to Read animation Position , but i want when my ball collide with wall or collision stuff remove Constraint Prim Part , i try use simple cheat pointcloud but still don't now how can Run my condition between "Geometry " and "Constraint Geometry"  , maybe i think more complicate my mind ,  don't know how can fixed  

thanks

Milad

snowball.hip

[Ultraman]

any idea ./