sphere bounce in a box

[zerochen]

hi,

i want to let a sphere bounce in a box. is there a easier way to do that than adding for each side a plane or is that the right way?

thx:)

[zerochen]

hm have i expressed me unhappy?

so i think there isnt a var to change the collision side of a box. eg from collision happens if a object is inside the box to collision happens if the obj is moving outside of the box?