Multiple overlapping views on one Canvas3D

I'm trying to write a spaceship flying game. The main view will obviously be from the cockpit of the spaceship. I'd like another view from the back of the spaceship and I'd like that view to be in a small box that sits near the corner of the screen (within the bounds of the main view).
I imagine that this would be straightforward in immediate mode but I'd like to do it the scenegraph way. Is there a subclass of "Leaf" that is actually another virtual canvas?
I've used OpenGL but I'm a Java3D newbie.

Thanks, that does help. I have another question now...
Instead of just copying the canvas image to a texture every X seconds, is there a way to do it every frame. I'd like the frames to be exactly synchronized between the two. Do I have to stop the views and use the View.renderOnce() function? For example:
while (run) {
   rearView.renderOnce();
   // copy rearCanvas to rearViewMirrorTexturePane
   frontView.renderOnce();
}Does that need to be in a separate thread to match what Java3D usually does?
I'd also like to know how big the rear-view mirror will be when displayed so that I can resize the off-screen Canvas3D to the same size. This way there wont be any stretching artifacts. Is there any way to get Java3D to calculate the display size of the mirror Shape3D for you automatically? I guess using a really large off-screen Canvas3D will reduce the problem but that'll also be unnecessary rendering.

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