[JAVA3D] How to periodically show text in PureImmediate mode

[Guang Bin Liu]

Hi Friends:   I am using PureImmediate mode to render Geometry and Text2D intermittently.  I found that If I render Geometry and Text2D, only the Text2D can be viewed.  There was a blank screen during the time when Geometry should be rendered.  When I Wrapped the Geometry and Text2D in Shape3D separately and render the Shape3D, still only text2D could be viewed.  But there were some error messages shown when the Geometry was going to be rendered, as following:   java.lang.NullPointerException  at javax.media.j3d.GraphicsContext3D.doDraw(GraphicsContext3D.java:1939)  at javax.media.j3d.Renderer.doWork(Renderer.java:477)  at javax.media.j3d.J3dThread.run(J3dThread.java:250) Could any one tell me why it was and how to fix it?    In fact, my task is quite simple: I want to display some text information intermittently on the selected position of the screen when the PureImmadiate.java is running.  Could any one give me some clue about how to do it?     Thank you!   G.B. Liu