Multiple JME contexts in Swing?

Troubleshooting General Help
1

Just wondering if it is possible to have two JME3 displays running concurrently?



Here is my startup code:



[java]

public class Main

{

public static void main(String[] args)

{

java.awt.EventQueue.invokeLater(new Runnable()

{



@Override

public void run()

{

AppSettings app1Settings = new AppSettings(true);

app1Settings.setWidth(640);

app1Settings.setHeight(480);



MyApp1 app1 = new MyApp1();

app1.setSettings(app1Settings);

app1.createCanvas();

JmeCanvasContext ctx = (JmeCanvasContext) app1.getContext();

ctx.setSystemListener(app1);

ctx.getCanvas().setPreferredSize(new Dimension(640, 480));

JFrame display1 = new MyFrame1(ctx, app1);

display1.setVisible(true);



app1.setPauseOnLostFocus(false);

app1.startCanvas();

}

});



java.awt.EventQueue.invokeLater(new Runnable()

{



@Override

public void run()

{

// generate grammar-tree view

AppSettings app2Settings = new AppSettings(true);

app2Settings.setWidth(640);

app2Settings.setHeight(480);

MyApp2 app2 = new MyApp2();

app2.setSettings(app2Settings);

app2.createCanvas();

JmeCanvasContext ctx = (JmeCanvasContext) app2.getContext();

ctx.setSystemListener(app2);

ctx.getCanvas().setPreferredSize(new Dimension(640, 480));

JFrame display2 = new MyFrame2(ctx, app2);

display2.setVisible(true);



app2.setPauseOnLostFocus(false);

app2.startCanvas();

}

});

}

}

[/java]



Seems pretty straightforward, but I get an error. If I comment either of the Runnables out, then the individual displays generate correctly. But here is the error I get if I try to do both:



[java]

Sep 19, 2011 2:20:51 PM com.jme3.app.Application handleError

SEVERE: Uncaught exception thrown in Thread[LWJGL Renderer Thread,6,main]

java.lang.NullPointerException

at org.lwjgl.opengl.GL11.glGetError(GL11.java:1278)

at org.lwjgl.opengl.Util.checkGLError(Util.java:57)

at org.lwjgl.opengl.WindowsContextImplementation.setSwapInterval(WindowsContextImplementation.java:113)

at org.lwjgl.opengl.ContextGL.setSwapInterval(ContextGL.java:231)

at org.lwjgl.opengl.DrawableGL.setSwapInterval(DrawableGL.java:86)

at org.lwjgl.opengl.Display.setSwapInterval(Display.java:1169)

at org.lwjgl.opengl.Display.setVSyncEnabled(Display.java:1182)

at com.jme3.system.lwjgl.LwjglCanvas.createContext(LwjglCanvas.java:449)

at com.jme3.system.lwjgl.LwjglCanvas.restoreCanvas(LwjglCanvas.java:265)

at com.jme3.system.lwjgl.LwjglCanvas.runLoop(LwjglCanvas.java:194)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:223)

at java.lang.Thread.run(Thread.java:662)

Sep 19, 2011 2:20:51 PM com.jme3.renderer.lwjgl.LwjglRenderer cleanup

INFO: Deleting objects and invalidating state

[/java]



Any ideas?

2

No, you can use a preView and render its output to an additional swing window though, look at TestRenderToMemory

3
normen said:
No, you can use a preView and render its output to an additional swing window though, look at TestRenderToMemory


"No" -- meaning that it is not possible to have multiple windows?

I'll look into TestRenderToMemory.
4

“No” was the answer to your initial question, yeah.

5

Will using createPreView allow me to show two different scenes, or just a different view of one scene?

6

Yes you can attach any scene to the preview.

7

Hey,



So the TestRenderToMemory example shows a single geometry being added as “the scene”, i.e., a box geometry gets added to the viewport. But my scene is more complex than that, and I’m not sure how to “attach” it. I wish there was a more complex example than just adding a box.

8

You just need to attach some node, then that node works like the “normal” rootNode. :roll:

9

There are other examples which attach more things than a “box” …

10

Hmm… Ok. I’l check the source folders for those examples again then.

11

Well, I’m struggling to find any examples that are more helpful than what’s already in the folder jme3test/post.



Anyways, I’ve managed to attach a Skybox to my scene. But I can’t seem to add any geometry unless it is textured. Does that make sense? For instance, a box with the jme logo is displayed in the TestRenderToMemory class:



[java]

Box boxMesh = new Box(Vector3f.ZERO, 30, 30, 30);

Material material = assetManager.loadMaterial(“Interface/Logo/Logo.j3m”);

offBox = new Geometry(“box”, boxMesh);

offBox.setMaterial(material);

offBox.updateGeometricState();

offView.attachScene(offBox);

[/java]



But if I change to box to respond to lighting, nothing happens:



[java]

Box b = new Box(Vector3f.ZERO, 30, 30, 30);

offBox = new Geometry(“plane cube”, b);

Material mat = new Material(assetManager, “Common/MatDefs/Light/Lighting.j3md”);

mat.setBoolean(“UseMaterialColors”, true);

mat.setColor(“Ambient”, ColorRGBA.LightGray);

mat.setColor(“Diffuse”, ColorRGBA.Blue);

mat.setColor(“Specular”, ColorRGBA.LightGray);

mat.setFloat(“Shininess”, 1);

offBox.setMaterial(mat);

//offBox.setShadowMode(ShadowMode.Receive);

offBox.updateGeometricState();

offView.attachScene(offBox);

[/java]



Now, if I add the CartoonEdgeFilter, then I can see the edges of the box, but that’s it.



What am I missing?

12
Momoko_Fan said:
To have lighting, you need a light


Of course you do. Maybe I should have posted more code.
13

To have lighting, you need a light