[Backup]

You have to call bmod_object_set_callback(entity,1) on objects you want to get callback from.

public whatever(){
    ...
    new Float:size[3] = {24.0,24.0,24.0}
    bmod_object_add(entity,BMOD_sphere,1.0,size)
    bmod_object_set_callback(entity,1)
}
public bmod_forward_contact(ent1,ent2,Float:distance){
    ...
}

If you don't want to get callback anymore, call bmod_object_set_callback(entity,0).

Is this bad 'feature'? Should every object call this callback automaticly?