Can I link non j3o files to scene using AssetLinkNode?

Troubleshooting import-assets
1

Hi

I am using AssetLinkNode to export my scene to j3o.
When I am linking a j3o ModelKey it export/loads fine but when I am linking xbuf ModelKey I can export the scene but I get following error when loading it.

java.lang.OutOfMemoryError: Java heap space
	at com.jme3.export.binary.BinaryImporter.readString(BinaryImporter.java:290) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:181) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:125) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:109) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.scene.AssetLinkNode.read(AssetLinkNode.java:177) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.readObject(BinaryImporter.java:342) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.resolveIDs(BinaryInputCapsule.java:483) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.readSavableArray(BinaryInputCapsule.java:471) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.readSavableArrayList(BinaryInputCapsule.java:587) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.scene.Node.read(Node.java:744) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.readObject(BinaryImporter.java:342) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.resolveIDs(BinaryInputCapsule.java:483) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.readSavableArray(BinaryInputCapsule.java:471) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.readSavableArrayList(BinaryInputCapsule.java:587) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.scene.Node.read(Node.java:744) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.readObject(BinaryImporter.java:342) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.resolveIDs(BinaryInputCapsule.java:483) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.readSavableArray(BinaryInputCapsule.java:471) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryInputCapsule.readSavableArrayList(BinaryInputCapsule.java:587) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.scene.Node.read(Node.java:744) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.readObject(BinaryImporter.java:342) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:242) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:125) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:109) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.asset.DesktopAssetManager.loadLocatedAsset(DesktopAssetManager.java:259) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.asset.DesktopAssetManager.loadAsset(DesktopAssetManager.java:373) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:416) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:420) ~[jme3-core-3.2.0-SNAPSHOT.jar:3.2-6188]
	at com.overthemoon.core.state.editor.EditorState$LoadCommand$1.execute(EditorState.java:756) ~[editor-client-0.1-SNAPSHOT.jar:?]
	at com.overthemoon.core.state.editor.EditorState$LoadCommand$1.execute(EditorState.java:746) ~[editor-client-0.1-SNAPSHOT.jar:?]
	at com.simsilica.lemur.core.CommandMap.runCommands(CommandMap.java:61) ~[lemur-1.10.1.jar:?]
	at com.simsilica.lemur.Button.runClick(Button.java:333) ~[lemur-1.10.1.jar:?]

I have already registered Xbuf loader to AssetManager.

So want to get sure if linking a non j3o extension is possible through AssetLinkNode ?

Thanks

2

Created a simple test case :

public class TestXbufAssetLinkNode extends SimpleApplication {

    public void simpleInitApp() {

        assetManager.registerLoader(XbufLoader.class, "xbuf");

        //Step 1: (works fine)
        //createScene();
        
        //Step 2: (throws exception)
        loadScene();
        
        
        
        /**
         * A white, directional light source
         */
        DirectionalLight sun = new DirectionalLight();
        sun.setDirection((new Vector3f(-0.5f, -0.5f, -0.5f)).normalizeLocal());
        sun.setColor(ColorRGBA.White);
        rootNode.addLight(sun);

    }

    private void createScene() {
        //Create scene
        AssetLinkNode wall = new AssetLinkNode("wall", new ModelKey("wall.xbuf"));
        wall.attachLinkedChildren(assetManager);
        
        //Save scene
        final BinaryExporter exp = BinaryExporter.getInstance();

        final File file = new File("/media/idea/My Passport/Java/jME_NB-PW-11-6-2015/OverTheMoon/assets/Models/modular-room-props/wall-linked.j3o");

        try (FileOutputStream out = new FileOutputStream(file)) {
            
            file.createNewFile();
            exp.save(wall, out);
        
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        rootNode.attachChild(wall);
        
    }

    private void loadScene() {
        //Load generated scene
        Spatial wall = assetManager.loadModel(new ModelKey("wall-linked.j3o"));
        rootNode.attachChild(wall);
    }
    
    
     @Override
    public void simpleUpdate(float tpf) {

    }

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

}

output :

java.lang.OutOfMemoryError: Java heap space
	at com.jme3.export.binary.BinaryImporter.readString(BinaryImporter.java:290)
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:181)
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:125)
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:109)
	at com.jme3.scene.AssetLinkNode.read(AssetLinkNode.java:177)
	at com.jme3.export.binary.BinaryImporter.readObject(BinaryImporter.java:342)
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:242)
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:125)
	at com.jme3.export.binary.BinaryImporter.load(BinaryImporter.java:109)
	at com.jme3.asset.DesktopAssetManager.loadLocatedAsset(DesktopAssetManager.java:259)
	at com.jme3.asset.DesktopAssetManager.loadAsset(DesktopAssetManager.java:373)
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:416)
	at com.overthemoon.main.TestXbufAssetLinkNode.loadScene(TestXbufAssetLinkNode.java:96)
	at com.overthemoon.main.TestXbufAssetLinkNode.simpleInitApp(TestXbufAssetLinkNode.java:55)
	at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:220)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:130)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:211)
	at java.lang.Thread.run(Thread.java:745)

Note :
In step 1

 //Create scene
        AssetLinkNode wall = new AssetLinkNode("wall", new ModelKey("wall.xbuf")); 
        wall.attachLinkedChildren(assetManager);

If I link a .j3o file (instead of .xbuf) everything will work fine when loading the scene (step 2).

Looks like a bug.
Any thoughts ?

3

Have you tried to increase the heap memory actually? Maybe the xbuf Import just uses more ram since it cant be directly loaded into the Scene?

4

@Darkchaos thanks for replying

Yes I tried to increase it, but no difference, the error shows up.
The file size is very small (1 KB), it is just a simple cube model.
When I directly load it (without using AssetLinkedNode) it works fine.

I do not know how AssetManager is working internally, but I guess ( most likely sure :wink:) when loading the scene it tries to load it with j3o loader instead of using Xbuf loader. Because when I am commenting this line when loading the scene (step 2)

//assetManager.registerLoader(XbufLoader.class, "xbuf");

It does not throw any exception regarding Xbuf loader is not registered, which makes me sure that it does not use Xbuf loader at all.

5

It’s possible that the AssetLinkNode only works with j3o since JME is designed to only deploy with j3o support.

6

Yes, I guess.
I just wanted to get sure about it. :slight_smile: