The background geometry feature of the Java 3D Background node
should do just what you describe. It renders a subgraph of
geometry into the background that is only effected by rotation.
Doug Twilleager
Sun Microsystems
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>Subject: [JAVA3D] Building custom backgrounds
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>Folks,
>
>This one is a seeking of collective wisdom, because I'm not sure anyone
>has done this in j3d before...
>
>The VRML spec requires a background node. This background is described
>as a textured box held inside a colored sphere. This background can be
>placed arbitrarily in the scenegraph. The nasty part is that the
>background should be effected by rotation only. Scale and Translation
>should not effect it (*YUCK*).
>
>The first bit I can deal with to get the sphere to the right size - use
>getLocalToVWorld and just reverse any translations and scaled. However,
>I need to deal with this on a dynamic basis. As the user changes parent
>transforms, I need to re-adjust the background as needed.
>
>One way of looking at this is to have behaviours on the parent
>Transforms to listen for TransformChange events. The problem we have
>here is one of performance (don't want to have arbitrarily nested sets
>of transforms and behaviours) and that the scenegraph can dynamically
>change (ie someone removes the background etc). Also, when placed in a
>Loader arena, the localToVWorld transform might be badly out.
>Right at the moment I can get a very simple impl, but was wondering if
>anyone has suggestions on a better approach to this problem. (This VRML
>spec is a bitch to implement in some places!)
>
>--
>Justin Couch http://www.vlc.com.au/~justin/
>Freelance Java Consultant http://www.yumetech.com/
>Author, Java 3D FAQ Maintainer http://www.j3d.org/
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> - Greg Bear, Slant
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