AnimControl NullPointerException help

Troubleshooting General Help
1

Greetings! I’m new to importing from Blender, etc. So far, I can load my model, but the issue I’m having is loading the animation. I can see the model and animation in the Scene Explorer just fine. But, the code I’m using to attempt to load the animation is causing a NullPointerException. Can anyone take a glance at this and tell me what I’m missing please?

[java]
Spatial gun1 = assetManager.loadModel(“Models/Game Gun 1/Game Gun 1.j3o”);
Material m_gun1 = new Material(assetManager, “Common/MatDefs/Misc/Unshaded.j3md”);
Texture t_gun = assetManager.loadTexture(“Textures/Sub.jpg”);

    m_gun1.setTexture("ColorMap", t_gun);
    
    gun1.setMaterial(m_gun1);
    gun1.setLocalTranslation(Vector3f.ZERO);
    
    rootNode.attachChild(gun1);
    
    control = gun1.getControl(AnimControl.class);
    channel = control.createChannel();   //ERROR HAPPENS HERE
    channel.setAnim("Fire");

[/java]

2

For reference, here is my whole file:

[java]
package mygame;

import com.jme3.animation.AnimChannel;
import com.jme3.animation.AnimControl;
import com.jme3.app.SimpleApplication;
import com.jme3.input.MouseInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.MouseButtonTrigger;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.Spatial;
import com.jme3.scene.shape.Box;
import com.jme3.light.;
import com.jme3.texture.Texture;
import com.jme3.animation.AnimEventListener;
import com.jme3.animation.LoopMode;
import com.jme3.scene.Node;
import java.util.logging.;

public class Main extends SimpleApplication {
private static final Logger logger = Logger.getLogger(Main.class.getName());

private AnimChannel channel;
private AnimControl control;  

public static void main(String[] args) {
    Main app = new Main();
    app.start();
}

@Override
public void simpleInitApp() {
    flyCam.setMoveSpeed(20);
    flyCam.setZoomSpeed(0);
    
    viewPort.setBackgroundColor(ColorRGBA.DarkGray);
    
    inputManager.addMapping("Fire", new MouseButtonTrigger(MouseInput.BUTTON_LEFT));
    inputManager.addListener(actionListener, "Fire");
    
    Spatial gun1 = assetManager.loadModel("Models/Game Gun 1/Game Gun 1.j3o");
    Material m_gun1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    Texture t_gun = assetManager.loadTexture("Textures/Sub.jpg");
    
    m_gun1.setTexture("ColorMap", t_gun);
    
    gun1.setMaterial(m_gun1);
    gun1.setLocalTranslation(Vector3f.ZERO);
    
    rootNode.attachChild(gun1);
    
    control = gun1.getControl(AnimControl.class);
    channel = control.createChannel();
    channel.setAnim("Fire");
    
    //logger.log(Level.INFO, control.getAnimationNames().toString());
}


private ActionListener actionListener = new ActionListener() {
    public void onAction(String name, boolean keyPressed, float tpf) {
        if (name.equals("Fire") && !keyPressed) {
            //channel.setAnim("");
        }
    }
};
 
private Spatial findNode(Node rootNode, String name) {
    if (name.equals(rootNode.getName())) {
        return rootNode;
    }
    return rootNode.getChild(name);
}

@Override
public void simpleUpdate(float tpf) {

}

@Override
public void simpleRender(RenderManager rm) {

}

}
[/java]

3

Look at the model in the SceneExplorer, the AnimControl probably isn’t attached to the root node but a sub-node. You can grab it by using Spatial.getChild(name).

1 Like
4

@normen Hm, I did’t get a “getChild()” method option on the “gun1” spatial…

5

@normen Also, FYI… in the Scene Explorer… the hierarchy is:

GUNMLP > AnimControl > Fire

6

Uh, right, its obviously on Node, so you have to cast it to Node, sorry ^^ GetChild() works recursively and gets you the first spatial by that name.

7

@normen

Ok, I’ve updated my code. I set another spatial to the getChild(“Fire”). And, it NULLs out.

[java]
Spatial gun1 = assetManager.loadModel(“Models/Game Gun 1/Game Gun 1.j3o”);
Material m_gun1 = new Material(assetManager, “Common/MatDefs/Misc/Unshaded.j3md”);
Texture t_gun = assetManager.loadTexture(“Textures/Sub.jpg”);

    m_gun1.setTexture("ColorMap", t_gun);
    
    gun1.setMaterial(m_gun1);
    gun1.setLocalTranslation(Vector3f.ZERO);
    
    rootNode.attachChild(gun1);
    
    Spatial animFire = rootNode.getChild("Fire");
    control = animFire.getControl(AnimControl.class);
    channel = control.createChannel();
    channel.setAnim("Fire");

[/java]

8

Nah, “GUNMLP” seems to be the spatial from what you say. “Fire” is the animation.

9

@normen Ok, ok… thank you for opening my eyes. That was the connection I was missing. I appreciate it - works great! :slight_smile: