LocalTranslation on Text causes crash

Troubleshooting General Help
1

Hi all,



I’ve been trying to set the local translation for text during calls to simpleUpdate():

[java] label.setLocalTranslation(localTranslation);[/java]

I also tried removing the label from the scene, setting the translation and re-attaching it:

[java] label.removeFromParent();

label.setLocalTranslation(localTranslation);

label.attachTo(scene);[/java]



Here my definition of Label:

[java]public Label(String text) {

this.text = text;



Quad q = new Quad(6, 3);

g = new Geometry(“quad”, q);

g.setLocalTranslation(0, -3, -0.0001f);

Material material = new Material(assetManager, “Common/MatDefs/Misc/SolidColor.j3md”);

material.setColor(“m_Color”, ColorRGBA.Black);

g.setMaterial(material);



BitmapFont fnt = assetManager.loadFont(“Interface/Fonts/Default.fnt”);

label = new BitmapText(fnt, false);

label.setColor(ColorRGBA.White);

label.setBox(new Rectangle(0, 0, 6, 3));

label.setQueueBucket(Bucket.Transparent);

label.setSize(0.3f);

label.setText(target.getMMSI());

}[/java]



Both cause the application to crash (screen just flickers between black and random colours and everything becomes unresponsive. Only a hard reboot helps).



Any help would be great, as always :slight_smile:

Thanks.

2

Do you have the latest drivers? Changing the local translation doesn’t really do anything, there’s no reason why the whole world would go down just because you changed some values in a matrix …

3

Yup, I updated my drivers yesterday and downloaded last night’s JME build.



Changing the local translation of other spatials works fine.



[java]label.setText(getLabelText());

localTranslation.setY(localTranslation.getY() + 2f);

label.setSize(0.3f);

label.setLocalTranslation(localTranslation);[/java]



I just realized that it is most likely isn’t setLocalTranslation, but maybe setText? Or something else altogether? As long as I uncomment all of the above, everything works fine. Otherwise everything just crashes…

4

are you modifiing it in the opengl thread

5

Yup, it’s running as part of simpleUpdate(). Well, to be precise, it is one of many updater objects registered in a queue whose contents is popped and executed as part of simpleUpdate().

6

Super-strange :confused: Why u always get the strange ones? ^^

7

I wish I knew :frowning: I must have enraged the Java Gods :stuck_out_tongue:

8

Apologies: It is in fact the changing of the display text that causes the problems, and not changing the local translation. Tried it on both an nVidia and ATI Radeon…

9

I tested this on a third machine. To summarize:



Given:



[java]BitmapFont fnt = assetManager.loadFont(“Interface/Fonts/Default.fnt”);

label = new BitmapText(fnt, false);

label.setColor(ColorRGBA.White);

label.setBox(new Rectangle(0, 0, 6, 3));

label.setQueueBucket(Bucket.Transparent);

label.setSize(0.3f);

label.setText(text);[/java]



Changing the text of label inside of simpleUpdate causes the everything to crash (black stripes flicker on screen, everything becomes unresponsive).



Re-attaching the label (i.e. label.removeFromParent(); … rootNode.attachChild(label)) causes the application to crash with an

invalid memory exception.

10

Somebody had problems with special characters and umlauts, maybe it works with a-z characters?

11

Are you calling those methods outside the rendering thread by any chance?

12

@normen: Thanks, but I tried that. Using a-z only produces the same results.

13

@momoko: No, this is all taking place inside of simpleUpdate().