How can I add a 3D geometry to a Lemur GUI?

1

Hello,

I am trying to create a minecraft-like inventory system using Lemur. To do this, I have geometries that represent inventory items added to a SpringGridLayout.

Here is my code:

@Override
protected void setupGui(){
    container = new Container(new SpringGridLayout(Axis.X, Axis.Y));

    container.addChild(new Label("Inventory"), 0, 0);

    Material mat = new Material(getApp().getAssetManager(), "Common/MatDefs/Misc/Unshaded.j3md");
    mat.setColor("Color", ColorRGBA.Green);

    for(int x=0;x<8;x++){
        for(int y=1;y<=4;y++){
            Geometry geometry = new Geometry("inventory-" + x + "," + y, new Box(1, 1, 1));
            geometry.setMaterial(mat);
            geometry.setLocalScale(16);
            geometry.rotate(new Quaternion().fromAngleAxis(toRadians(-25), Vector3f.UNIT_X));
            geometry.rotate(new Quaternion().fromAngleAxis(toRadians(-45), Vector3f.UNIT_Y));

            Node node = new Node(); //a similar error that requests a node occurs when the inventory item is attached directly
            node.attachChild(geometry);

            container.addChild(node, x, y);
        }
    }

    container.setLocalTranslation(getApp().getCamera().getWidth() / 2 - container.getSize().length() / 2, getApp().getCamera().getHeight() / 2 - container.getSize().getY() / 2, 0f);
    getApp().getGuiNode().attachChild(container);
}

private float toRadians(float degrees){
    return (degrees / 180) * FastMath.PI;
}

When I run it I get the following error:

java.lang.IllegalArgumentException: Child is not GUI element.
    at com.simsilica.lemur.component.SpringGridLayout.addChild(SpringGridLayout.java:326)
    at com.simsilica.lemur.component.SpringGridLayout.addChild(SpringGridLayout.java:392)
    at com.simsilica.lemur.Container.addChild(Container.java:112)
    at src.john01dav.lemurlearning.InventoryGuiAppState.setupGui(InventoryGuiAppState.java:40)
    at src.john01dav.lemurlearning.GuiAppState.initialize(GuiAppState.java:15)
    at com.jme3.app.state.AppStateManager.initializePending(AppStateManager.java:251)
    at com.jme3.app.state.AppStateManager.update(AppStateManager.java:281)
    at com.jme3.app.SimpleApplication.update(SimpleApplication.java:236)
    at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
    at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:193)
    at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:232)
    at java.lang.Thread.run(Thread.java:745)

The only reason I would use Lemur over Nifty (or even just somehow embedding Swing) is because of it’s inherent ability to use 3D objects as described in other threads.

2

In order to be managed by a layout, as addChild() would do, the child has to be what Lemur considers a “GUI element”. But that’s not as onerous as it sounds.

Any JME Spatial can be a “GUI element” simply by adding a GuiControl to it. You will need to set a preferred size on the GuiControl. After that things should “just work”.

On my to-do list is to write something like IconComponent but for spatials instead of images. This would let one pop a 3D object into any regular GUI element’s component layers (like Button, Label, etc.).

5 Likes
3

@pspeed I have to say … I have 3 technologies on my gui right now … tonegodgui, javafx, and lemur. After the coding I have been doing this past week I have just decided to scrap tonegodgui cause lemur KICKS IT’S ASS!!

1 Like
4

Thanks! :slight_smile:

1 Like
5

I also think about replacing tonegodGUI on lemur in my game, which use the mix javafx + tonegoGUI :slight_smile:

3 Likes
6

The great thing about lemur is that components don’t need to be attached to a Screen like in tonegodgui … another great feature is in my space game all the ship models have a GUIControl on them so cloning them and dropping them into Information windows while they spin in a preview pane is literally one line of code. Having a unified mouse/animation event handler for the gui and the game assets is another cool feature … I can go on and on.

3 Likes
7

Whee… it’s neat to see someone praise specific features I built in for exactly the reasons I built them. :slight_smile: Thanks, again.

3 Likes
8

By the way your network code has been running in production for over a week now … no glitches, no crashes :slight_smile:

1 Like
9

At some point you’re going to need a room guys…

Did you try the InputMapper? That’s gonna burst your bubble :wink:

10

And he means that in a good way. Not in a “you will be disappointed” way.

11

oh … it can mean that?
I meant “it’s gonna blow your mind”
Is that ok ? :slight_smile:

12

Yes, that’s better.

“Burst your bubble” at least in english means that “you were all excited and something disappointed you”. Like being happy because someone handed you a balloon but then it pops.

1 Like
13

I would rather just use Lemur and drop a mouse listener on my spatial thank you very much :stuck_out_tongue:

14

InputMapper is part of Lemur. It allows you to map keys, mouse input, joystick buttons, etc. to listeners in a nice way. It supports key combos and such.

2 Likes