This sounds like a bug in Java 3D. If you have a simple test program, please
send it to [EMAIL PROTECTED]
--
Kevin Rushforth
Java 3D Team
Sun Microsystems
[EMAIL PROTECTED]
>Date: Mon, 23 Aug 1999 14:43:15 -0400
>From: Bob Gray <[EMAIL PROTECTED]>
>Subject: [JAVA3D] Java 3D Error message
>To: [EMAIL PROTECTED]
>
>I define polyhdera as Shape3D and I set its capabilities to include
>ALLOW_GEOMETRY_WRITE and ALLOW_APPEARANCE_WRITE
>
> theShapes[i].setGeometry(thePolyhedra[i].Line());
> theShapes[i].setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
> theShapes[i].setAppearance(AA.createAppearanceLine(thePolyhedra[i]));
> theShapes[i].setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
>
>This initially displays the polyhdera as lines.
>
>Durring interaction, I can type a key to display the polyhedra
>as solids.
>
>I do this by changing the Geometry and the Appearance.
>
>When I then change back to displaying the polyhedra as lines
>(again by changing the Shape3D's Geometry and Appearance) I get
>the following error:
>
>java.lang.NullPointerException:
> at javax.media.j3d.RenderQueue.remove(RenderQueue.java:724)
> at javax.media.j3d.RenderQueue.insert(RenderQueue.java:359)
> at javax.media.j3d.Traverser.insertRenderObjects(Traverser.java:599)
> at javax.media.j3d.Traverser.run(Traverser.java:211)
>
>This seems to be pointing to Java 3D code and not my code.
>Is there some reason I can't change a Shape3D's Geometry and
>Appearance multiple times after the scene has been compiled?
>
>Any suggestions on how to figure out what's wrong?
>
>Bob Gray
>
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