Using the Entity class

Troubleshooting General Help
1

I'm curious about how to use the Entity class. For example, when I add the Entity's Spatial to the tree, if I select it or collide with it, I'm going to get back the Spatial, not the Entity. Is there a document that describes how the Entity is meant to be used in general? Similarly, how are we meant to update Entities? Should I be keeping a list of all the Entities in my gamestate and then iterate over them for updates? Or is there another preferred means of dealing with them?

2

You can get the entity of a colliding geometry like so:


Geometry collidedGeom = ...
Spatial parent = collidedGeom.getParent();
while (parent != null && !(parent instanceof Entity)){
     parent = parent.getParent();
}
Entity entity = (Entity) parent;


The preferred way of updating entities is by extending the "Controller" class, and then attaching an instance of it to the entity using Entity.addController()
3

Hmm, am I looking at the wrong Entity class? Or has it changed since JME2? The one in JME2 is not a subclass of Spatial.