[vtkusers] rotating a volume around its center

[Jesse Corrington]

I have created a volume, and now i want to rotate it 360 degrees around 1 
axis and save an image at each position.  When i try do volume.rotateX the 
volume does not rotate around its center, so it eventually ends up off the 
screen.  How can i fix this.  Also, here is how i set the initial camera 
position, incase that matters.  Also, when i just interact with the volume 
and rotate it with the mouse, it does rotate around its center.

        // set the initial view
	vtkCamera aCamera = new vtkCamera();
	aCamera.SetViewUp (0, 0, -1);
	aCamera.SetPosition (0, 1, 0);
	aCamera.SetFocalPoint (0, 0, 0);
	aCamera.ComputeViewPlaneNormal();

thanks for the help

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