JBox2D碰撞不反弹

Question

I have an Android application using JBox2D for physics simulation. The only dynamic object is a 0.07m radius circle, as well as several static circles and rectangles in a total game area of about 20m by 20m. I'm also using a few custom forces through the ApplyForce method.

Whenever any bodies collide, they do collide correctly however they don't bounce; everything just thuds together. All bodies have their densities, frictions and restitutions set (some objects have a restitution greater than 1).

Does anyone have any ideas why these collisions aren't working? I think it might be because the bodies aren't moving fast enough for JBox2D to count as proper collisions (there is a cutoff in Box2D).

Thanks!

Answer 1

setting Settings.velocityThreshold = 0.0001f; (or very small) solved it for me.

Answer 2

我发现了部分解决方案-如果速度低于某个阈值，Box2D（至少是JBox2D）会忽略恢复原状-通过将我的所有对象放大10倍，阈值变得相对较低，对象反弹。