I have run the AlphaTest, which for me does not display anything. Are there additonal test for the various behaviors??
I cannot tell you too much abour behaviors in general. But if you only want to rotate a group around an axis, you should have a look at org.xith3d.behaviors.impl.RotatableGroup and (more general) org.xith3d.behaviors.Animatable. They can be perfectly used with ExtRenderLoop. org.xith3d.test.amination.* demostrate the usage.
There are two “concurrent” behavior systems. You can use croft’s one as is, or use Qudus’ animatable interface, which is pretty handy though too tied to the scenegraph which makes me not use it.
Not that I recall.