[JAVA3D] KeyNavigatorBehavior and thrashing

[Andrew R. Thomas-Cramer]

  I'm getting thrashing when I use KeyNavigatorBehavior.

  I've tried turning off mouse navigation, decreasing the bounds in the bounding leaf, and using an ordinary bounds instead of a bounding leaf. Thrashing still occurs.

  Does anyone happen to know of a problem with KeyNavigatorBehavior with J3D 1.1.2, or an error in my approach below?

 

 

    Bounds behaviorBounds = new BoundingSphere( new Point3d(), 2000.0 );
   ...

    if ( bRotate && bTranslate && bZoom ) {
      KeyNavigatorBehavior behavior = new KeyNavigatorBehavior( vpTrans );
      m_bgNavBehavior.addChild( behavior );

 

      BoundingLeaf boundingLeaf = new BoundingLeaf( behaviorBounds );
      m_bgNavBounds.addChild( boundingLeaf );
      behavior.setSchedulingBoundingLeaf( boundingLeaf );
    }

 

    //===========================================================
    // Add the new bounds to the view branch.
    //===========================================================
   
    try {
      if ( null == super.platformGeometry ) {
        super.setPlatformGeometry( new PlatformGeometry() );
      }
  
      super.platformGeometry.setCapability( javax.media.j3d.Group.ALLOW_CHILDREN_EXTEND );
      super.platformGeometry.addChild( m_bgNavBounds );
      super.platformGeometry.compile();
    }
    catch ( javax.media.j3d.RestrictedAccessException e ) {
      // No-op: platformGeometry already compiled. Probably already existed.
    }
   
    //===========================================================
    // Add the new behaviors to requested content branch.       

    //===========================================================
   
    newBehaviorParent.addChild( m_bgNavBehavior );