翻译

注意，如果只是让几何图形做简单的运动，任何几何图形都可以做到。比如一个没有运动功能的篮球，您可以让他在场景中来回来去的飞，但是他始终是一个球体。篮球是一个 model 而不是 actor 。

主旨：

"Note that a geometry is only considered animated if it changes shape. So for example, a baseball wouldn't be considered animated: it may fly all over the place, but it stays a sphere. A baseball would be a model, not an actor."
- Panda3D Manual （查看 Google 边栏评注）