Can not cast spatial to geometry

Troubleshooting General Help
1

Hi guys I have been using this code to make a simple ship:



[java]

package mygame;



import com.jme3.asset.AssetManager;

import com.jme3.input.InputManager;

import com.jme3.input.KeyInput;

import com.jme3.input.controls.AnalogListener;

import com.jme3.input.controls.KeyTrigger;

import com.jme3.material.Material;

import com.jme3.scene.Node;

import com.jme3.scene.Spatial;



public class Player {



public Spatial b;



Main game;



AssetManager assetManager;

InputManager inputManager;



Node rootNode;



Player(Main aThis){

game = aThis;

rootNode = game.getRootNode();

assetManager = game.getAssetManager();

inputManager = game.getInputManager();



b = (Spatial) assetManager.loadModel("Models/Garbage Pod.j3o");



System.out.println(b.getLocalTranslation());



Material mat_lit = new Material( assetManager, "Common/MatDefs/Light/Lighting.j3md");

mat_lit.setTexture("m_DiffuseMap", assetManager.loadTexture("Textures/GPod.tga"));

mat_lit.setFloat("m_Shininess", 10f); // [0,128]

b.setMaterial(mat_lit);



rootNode.attachChild(b);



initKeys(); // load my custom keybinding



}



/** Custom Keybinding: Map named actions to inputs. /

private void initKeys() {

/* You can map one or several inputs to one named mapping. /



inputManager.addMapping("Left", new KeyTrigger(KeyInput.KEY_LEFT));

inputManager.addMapping("Right", new KeyTrigger(KeyInput.KEY_RIGHT));

inputManager.addMapping("Up", new KeyTrigger(KeyInput.KEY_UP));

// left click!

/* Add the named mappings to the action listeners. /

inputManager.addListener(analogListener, new String[]{"Left", "Right", "Up"});

}



/* Use this listener for continuous events /

private AnalogListener analogListener = new AnalogListener() {

public void onAnalog(String name, float value, float tpf) {

if (name.equals("Right")) {

b.rotate(0, -5tpf ,0);

}

if (name.equals("Left")) {

b.rotate(0, 5*tpf,0);

}

if (name.equals("Up")) {

}

}

};

}[/java]





It has been working for a while now. I dont remember making ANY changes to this code but all of the sudden i am getting this error:


Jan 23, 2011 3:21:13 PM com.jme3.app.Application handleError
SEVERE: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
java.lang.ClassCastException: com.jme3.scene.Node cannot be cast to com.jme3.scene.Geometry
at mygame.Player.(Player.java:46)
at mygame.Main.simpleInitApp(Main.java:54)
at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:186)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:134)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:188)
at java.lang.Thread.run(Thread.java:662)


I know what the error means but I have no clue what could be causing it, Since this code has worked for me before. Does anyone see any errors? I sure couldnt after looking over it so many times :S.
2

I think, that for one reason or other, this line:

[java]assetManager.loadModel("Models/Garbage Pod.j3o")[/java]

now returns a node, rather than a spatial. What used to be a spatial has become a child of a node.

See if it helps to cast it to Node instead. If you want to dig into it, do a print out of the children of that node and see what it brings.

3

The stack trace you posted doesn’t match the code!

The crash is at “mygame.Player.(Player.java:46)”

But line 46 just has a comment:

[java] /** You can map one or several inputs to one named mapping. */[/java]



In any case, you shouldn’t cast models you get with loadModel() to geometry.

Since loadModel() returns a Spatial object, just use that as is

4

Oh yes, thats another thing i forgot to mention. It points to line 46 even if i take out half the code… even if line 46 is blank. It will error there.



ANND, changing the spatial object to a Node does not make a difference. Ive tried it already. This is why i’m so darn confused :(.

5

I think you forgot to recompile the code :stuck_out_tongue:

It’s still using the old one obviously

6

Figured it out, just had to build & clean then it worked. Thanks!