postSwap method, or call waitForOffScreenRendering.
@exception NullPointerException if the off-screen buffer is null.
@exception IllegalStateException if this Canvas3D is not inoff-screen mode, or if either the width or the height of the associated Screen3D's size is <= 0, or if the associated Screen3D's physical width or height is <= 0.
@exception RestrictedAccessException if an off-screen renderingis already in process for this Canvas3D or if the Java 3D renderer is stopped.
@see #setOffScreenBuffer
@see Screen3D#setSize(int,int)
@see Screen3D#setSize(Dimension)
@see Screen3D#setPhysicalScreenWidth
@see Screen3D#setPhysicalScreenHeight
@see #waitForOffScreenRendering
@see #postSwap
@since Java 3D 1.2
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