List of All Members for Friction

这是完整成员列表为 Friction ，包括继承的成员。

• factor : real
• threshold : real

The following members are inherited from Affector .

• acceleration : StochasticDirection
• enabled : bool
• groups : list<string>
• once : bool
• position : StochasticDirection
• relative : bool
• shape : Shape
• system : ParticleSystem
• velocity : StochasticDirection
• whenCollidingWith : list<string>
• affected (real x , real y )