Hi All,
I'm new to java3d, I'm having trouble allowing the user to add and remove
objects in the scene. I'm not sure how to remove a child object from a
BranchGroup. I alwas get a
Exception occurred during event dispatching:
java.lang.NullPointerException.
I tried it with detach()!
How can optimize this code??
Thanks, N
BranchGroup scene;
BranchGroup objRoot = new BranchGroup();
TransformGroup objTrans = new TransformGroup();
SimpleUniverse u = null;
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
// Event: when user click a Button
public void drawnew() {
scene.detach();
Transform3D t3 = new Transform3D();
TransformGroup objTrans = new TransformGroup(t3);
BranchGroup objBGroup = new BranchGroup ();
objBGroup.setCapability(BranchGroup.ALLOW_DETACH);
objTrans.addChild(new ColorCube(0.5));
objBGroup.addChild (objTrans);
scene.addChild(objBGroup);
u.addBranchGraph(objTrans);
setVisible(true);
}
public BranchGroup createSceneGraph() {
objRoot.setCapability (Group.ALLOW_CHILDREN_WRITE);
objRoot.setCapability (Group.ALLOW_CHILDREN_EXTEND);
objRoot.setCapability (Group.ALLOW_CHILDREN_READ);
objRoot.setCapability (BranchGroup.ALLOW_DETACH);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objRoot.addChild(objTrans);
objTrans.addChild(new ColorCube(1.5));
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE,
0, 0,
4000, 0, 0,
0, 0, 0);
addLights(objRoot);
return objRoot;
}
public void init() {
parent=new BranchGroup();
scene = new BranchGroup();
setLayout(new BorderLayout());
add("Center", c);
scene = createSceneGraph();
scene.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
scene.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);
u = new SimpleUniverse(c);
TransformGroup viewTrans =
u.getViewingPlatform().getViewPlatformTransform();
u.addBranchGraph(scene);
setVisible(true);
}
protected void addLights(BranchGroup b){
Color3f ambientColour = new Color3f(1.0f,1.0f,1.0f);
AmbientLight ambtLight = new AmbientLight(ambientColour);
ambtLight.setInfluencingBounds(bounds);
Color3f dirLightColour = new Color3f(1.0f, 1.0f, 1.0f);
Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f);
DirectionalLight dirLight = new DirectionalLight(dirLightColour,
dirLightDir);
dirLight.setInfluencingBounds(bounds);
b.addChild(ambtLight);
b.addChild(dirLight);
}
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