Hi,
I have a simple
Java3d applet, pretty much like the HelloUniverse in structure. I have the
objRoot and objTrans as private members of the class. At the end of my
CreateSceneGraph routine, I have a transform which starts the objects rotating
(exactly like in HelloUniverse). What I want to do is to place this code into
another method called startRotate so I can control the rotation from _javascript_
- i.e. turn it on and off.
When I move my code
into a separate method, the applet runs and I can call the method from
_javascript_ but I get a "javax.media.j3d.RestrictedAccessException: Group: only a
BranchGroup node may be added" error at run time. I have made objTrans private
to the class so I can get at it from my method, and I have set its capability to
ALLOW_TRANSFORM_WRITE. my code for the rotate method is shown below -
any clues as to what
I am doing wrong?
Chris
Bartlett
public class
visualiser extends Applet{
private SimpleUniverse u = null;
private VirtualInputDevice device =
null;
private TransformGroup objTrans =
null;
private BranchGroup objRoot =
null;
public BranchGroup createSceneGraph() {
objRoot = new BranchGroup();
objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
.
.
.
return objRoot;
}
public void init() {
Canvas3D c = new Canvas3D(config);
add("Center", c);
BranchGroup scene = createSceneGraph();
u =
new SimpleUniverse(c,4);
.
.
.
}
public void startRotate(){
System.out.println("Method
rotate invoked");
Transform3D yAxis = new
Transform3D();
Alpha rotationAlpha = new
Alpha(-1, Alpha.INCREASING_ENABLE,0, 0,36000, 0, 0,0, 0,
0);
RotationInterpolator rotator
=new RotationInterpolator(rotationAlpha, this.objTrans, yAxis,0.0f,
(float)
Math.PI*2.0f);
BoundingSphere bounds =new
BoundingSphere(new Point3d(0.0,0.0,0.0), 300.0);
new BoundingSphere(new
Point3d(0.0,0.0,0.0), Float.MAX_VALUE );
rotator.setSchedulingBounds(bounds);
this.objTrans.addChild(rotator);
}
}
