20 #ifndef BT_POLYHEDRAL_CONTACT_CLIPPING_H    21 #define BT_POLYHEDRAL_CONTACT_CLIPPING_H    48 #endif // BT_POLYHEDRAL_CONTACT_CLIPPING_H 
btVector3 can be used to represent 3D points and vectors. 
float btScalar
The btScalar type abstracts floating point numbers, to easily switch between double and single floati...