Undocumented attributes in class btCollisionObject

[mag827]

Hello,

Could anyone please explain how to use the following undocumented attributes in btCollisionObject?

- ActivationState
int getActivationState () const
void setActivationState (int newState)

- Island Tag
const int getIslandTag () const
void setIslandTag (int tag)

- Companion ID
const int getCompanionId () const
void setCompanionId (int id)


I'm not really sure what values these functions would accept.

Thank you.