Hierarchy of Objects in JME

Troubleshooting General Help
1

Hi all… I'd like to know / see a hierarchy chart of the objects in JME(e.g. Spatials, Geometry, Node, TriMesh)… so I could know whether to cast something with something or not… because my problem is that, I'm getting the ClassCastException for casting ColladaImporter.getModel()'s return (which is a Node) into a Geometry… it is because I would need it to become a geometry for later mousePicking via the getTargetMesh() function which returns only geometries… here's my stacktrace…


Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.jme.scene.Node cannot be cast to com.jme.scene.TriMesh
   at terrainModeling.TerrainModeler.addObject(TerrainModeler.java:1287)
   at terrainModeling.addObjectDialog$2.actionPerformed(addObjectDialog.java:180)
   at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
   at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
   at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
   at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
   at java.awt.Component.processMouseEvent(Unknown Source)
   at javax.swing.JComponent.processMouseEvent(Unknown Source)
   at java.awt.Component.processEvent(Unknown Source)
   at java.awt.Container.processEvent(Unknown Source)
   at java.awt.Component.dispatchEventImpl(Unknown Source)
   at java.awt.Container.dispatchEventImpl(Unknown Source)
   at java.awt.Component.dispatchEvent(Unknown Source)
   at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
   at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
   at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
   at java.awt.Container.dispatchEventImpl(Unknown Source)
   at java.awt.Window.dispatchEventImpl(Unknown Source)
   at java.awt.Component.dispatchEvent(Unknown Source)
   at java.awt.EventQueue.dispatchEvent(Unknown Source)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
   at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.run(Unknown Source)



thanks in advance for any help
2

LOL… you two are both speedy… thanks for all the help sbook… btw congrats to normen… Long Live JME!!!

3

The javadoc contains this info http://www.jmonkeyengine.com/doc/

Notice the inheritance tree and “Direct Known Subclasses:” info at the top of each classes javadoc file.

Spatial is the base class for scenegraph objects.

4

ColladaImporter.getModel() returns a Node, which is a subclass of a Spatial.  TriMesh also subclasses a Spatial.



For mousepicking, you can simply use:



Spatial s = results.getPickData(0).getTargetMesh();
while(!s instanceof Node){
     s = s.getParent();
}



Clearly that could be done with a recursive function but this seemed simpler to explain :)  When you come out of the while loop, you should have the Node that was given to you by the ColladaImporter.getModel(); method (That's assuming that you've combined your meshes in your modeling application before exporting the COLLADA file)

EDIT:  normen... he's speedy!
5

:smiley: I just have to press "Apple-2" to see "All Recent Posts" and I do so each time I have my browser open and my brain is idling :wink:

6
mhelz0001 said:

LOL... you two are both speedy.... thanks for all the help sbook.... btw congrats to normen... Long Live JME!!!


I haven't forgotten your other COLLADA thread either, I have to do some Maya tinkering a little bit later so I'll take a look at the models and load them then :)