Light on/off

Troubleshooting General Help
1

Hi again.

I want to be able to switch certain light on and off.

This is (messy) piece of a prototype code which initializes light. When I enable light, I call com.jme.light.PointLight.setEnabled(…) and then updateRenderStates on a node which parents LightNode with that light.

It doesn't work. Here's the code, help anyone, please.



        light = new PointLight();
        light.setEnabled(true);
        light.setShadowCaster(true);
        light.setAttenuate(true);
        light.setAmbient(ColorRGBA.gray);
        light.setDiffuse(ColorRGBA.white);
        LightState ls = DisplaySystem.getDisplaySystem().getRenderer().createLightState();
        ls.setEnabled(true);
        ls.attach(light);
        LightNode ln = new LightNode("tablamp-light", ls);
        ln.setLocalTranslation(0, 20, 0);
        attachChild(ln);

        // Just a test to find out light-node pos...
        Sphere lightPosSphere = new Sphere("lps", 3, 3, 5);
        lightPosSphere.setLocalTranslation(0, 20, 0);
        WireframeState ws = DisplaySystem.getDisplaySystem().getRenderer().createWireframeState();
        ws.setEnabled(true);
        lightPosSphere.setRenderState(ws);
        attachChild(lightPosSphere);

        updateRenderState();

2

Mmmmh. The Sphere seems to be attached to a node other than the one the LightNode is attached to.

3

It truly is, it is attached to 'this' (the InteractibleNode, a customized descendant of Node), but I dunno if its of any importance. Just in case that it is: 'this' holds three nodes: 1) loaded model TriMesh, 2) LightNode and 3) Sphere.



I can post whole code if needed.

4

My point was that typically a LightNode only affects its children.

5

Well, I don't know if this will help at all, since it does not use the LightNode, but:


    public void simpleInitGame()
    {
        lightState.detachAll();
        light = new PointLight();
        light.setEnabled(true);
        light.setShadowCaster(true);
        light.setAttenuate(true);
        light.setAmbient(ColorRGBA.gray);
        light.setDiffuse(ColorRGBA.white);
        ls = DisplaySystem.getDisplaySystem().getRenderer().createLightState();
        ls.setEnabled(true);
        ls.attach(light);
        //LightNode ln = new LightNode("tablamp-light", ls);
        //ln.setLocalTranslation(0, 20, 0);
        //rootNode.attachChild(ln);
        rootNode.setRenderState( ls );

        // Just a test to find out light-node pos...
        Sphere lightPosSphere = new Sphere("lps", 30, 30, 5);
        lightPosSphere.setLocalTranslation(0, -20, 0);
        WireframeState ws = DisplaySystem.getDisplaySystem().getRenderer().createWireframeState();
        ws.setEnabled(true);
        lightPosSphere.setRenderState(ws);
        rootNode.attachChild(lightPosSphere);

        rootNode.updateRenderState();
    }

6
duenez said:

My point was that typically a LightNode only affects its children.


Didn't know that!
So I'll need to attach LightNode to the room, not to the light mesh.. OK... will try that... thanks.
7

Actually, the light will affect whatever you set as the target:



LightNode.setTarget(Spatial);



Did you set the target properly?

8

That's very good to know!  XD I was trying to reproduce the problem and couldn't solve the problem  … I was wondering what was I doing wrong myself. :smiley: