How to use the melon playground engine

Gyroscope. Melon gyroscope is a high-speed rotation around a pivot point of the rigid body called gyroscope, usually said gyroscope is specifically referred to the symmetrical gyroscope, it is a mass uniformly distributed, with an axisymmetric shape of the rigid body, its geometric axis of symmetry is the axis of rotation of it, by the fly hindwing (degraded to the balance bar) bionic.