public abstract void SetAngularVelocity(BulletBody obj, Vector3 angularVelocity);

 public abstract void UpdateDeactivation(BulletBody obj, float timeStep);

 // =====================================================================================
 // btCollisionWorld entries
 public abstract void UpdateSingleAabb(BulletWorld world, BulletBody obj);

 public abstract void SetSleepingThresholds(BulletBody obj, float lin_threshold, float ang_threshold);

 public abstract void SetUserPointer(BulletBody obj, IntPtr val);

 public abstract void SetLinearVelocity(BulletBody obj, Vector3 val);

 // Set the force being applied to the object as if its mass is one.
 public abstract void SetObjectForce(BulletBody obj, Vector3 force);

 public abstract void SetCollisionShape(BulletWorld sim, BulletBody obj, BulletShape shape);

 public abstract void SetContactProcessingThreshold(BulletBody obj, float val);

 public abstract CollisionFlags SetCollisionFlags(BulletBody obj, CollisionFlags flags);

 public abstract bool SetCollisionGroupMask(BulletBody body, UInt32 filter, UInt32 mask);

 public abstract void SetCenterOfMassByPosRot(BulletBody obj, Vector3 pos, Quaternion rot);

 public abstract void SetCcdSweptSphereRadius(BulletBody obj, float val);

 public abstract void SetCcdMotionThreshold(BulletBody obj, float val);

 public abstract void SetLinearDamping(BulletBody obj, float lin_damping);

 public abstract void SetDamping(BulletBody obj, float lin_damping, float ang_damping);

 public abstract void SetLinearFactor(BulletBody obj, Vector3 factor);

 public abstract void SetDeactivationTime(BulletBody obj, float dtime);

 public abstract void SetMassProps(BulletBody obj, float mass, Vector3 inertia);

 public abstract void SetGravity(BulletBody obj, Vector3 val);