samer@0: /**
samer@0: 		ViewGroup.java
samer@0: 
samer@0: 		A View branch group containing a ViewPlatform
samer@0: 		and associated Views, Canvas3Ds and Windows to
samer@0: 		hold the canvases.  Can be added dynamically
samer@0: 		to a live universe.
samer@0: 
samer@0: 		Parameters:
samer@0: 			initial placement
samer@0: 			autostart canvas?
samer@0: 			autostart view?
samer@0: 			keyboard navigator?
samer@0: 			various view policies
samer@0: 
samer@0: 		Requirements:
samer@0: 			must be placable (hence TransformGroup and ViewPlatform)
samer@0: 			must be Node so addable to universe
samer@0: 			renderable:
samer@0: 				view.renderOnce()
samer@0: 				view.startView()
samer@0: 				view.stopView()
samer@0: 				canvas.startRenderer()
samer@0: 				canvas.stopRenderer()
samer@0: 				... ?
samer@0: 			disposable: cleans up properly
samer@0: 			must have accessible View and Canvas objects
samer@0: 			must manage multiple canvases for stereo
samer@0: 
samer@0:  */
samer@0: package samer.j3d;
samer@0: 
samer@0: import samer.core.*;
samer@0: import javax.media.j3d.*;
samer@0: import javax.vecmath.*;
samer@0: 
samer@0: 
samer@0: public class ViewGroup extends BranchGroup
samer@0: {
samer@0: 	TransformGroup	VT;
samer@0: 	ViewPlatform		VP;
samer@0: 	ViewBase			V;
samer@0: 
samer@0: 	public void lookFrom(Point3d eye, Vector3d up)
samer@0: 	{
samer@0: 		// view platform placement
samer@0: 		Transform3D		t=new Transform3D();
samer@0: 		t.lookAt(eye, new Point3d(0,0,0), up);
samer@0: 		t.invert();
samer@0: 		VT.setTransform(t);
samer@0: 	}
samer@0: 
samer@0: 	public ViewGroup()
samer@0: 	{
samer@0: 		VT=new TransformGroup();
samer@0: 		VP=new ViewPlatform();
samer@0: 		lookFrom(
samer@0: 			new Point3d(X.doubleArray(Shell.getString("lookfrom","(0,1,8)"),3)),
samer@0: 			new Vector3d(0,1,0)
samer@0: 		);
samer@0: 		VT.addChild(VP);
samer@0: 		addChild(VT);
samer@0: 
samer@0: 		// addChild(new FPS(200));
samer@0: 		// setCapability(ALLOW_DETACH);
samer@0: 		// setCapability(ALLOW_CHILDREN_WRITE);
samer@0: 	}
samer@0: 
samer@0: 	public void attachView(View v) { v.attachViewPlatform(VP); }
samer@0: }