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  Scenegraph IO  (Read 854 times)
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Offline bmyers

Junior Devvie





« Posted 2003-04-21 14:22:55 »

Has anybody else run into a problem with the scenegraph.io package dropping normals?

Here's what I'm doing:

1)  Create a Switch containing 3 Shape3Ds with different LODs
2)  Recalculate all the normals on the Shape3Ds to smooth over seams.
3)  Add the Switch to a BranchGroup
4)  Write out the BranchGroup using the SceneGraphFileWriter.
5)  Attach the BranchGroup to a live universe.

So that all seems to work, everything displays fine, including the smoothed normals.  

But then, I restart the program with a "load scenegraph" flag turned on:

1)  Read in the BranchGroup using a SceneGraphFileReader
2)  Attach the BranchGroup to a live universe.

The normals are messed up!  They are not even the original (non-smoothed) normals, but something else entirely!

The rest of the geometry, including texture coordinates, appearance, etc. is fine -- just the normals are clobbered.

Anybody else run into this problem?   Huh

Is anybody else actually using the Scenegraph IO utilities?   Huh

Offline William

Junior Devvie




No Exit


« Reply #1 - Posted 2003-04-21 17:22:21 »

I'm using the ScenegraphIO packages, but I have only used it for prelit textured geometry so I have not run into any problem with normals (a good extension to GeometryInfo would be a method that lets you change vertex format to get rid of unused info, like normals).

The known issues list for Java3D 1.3.1beta lists bug 4717595 (http://developer.java.sun.com/developer/bugParade/bugs/4717595.html ) as a problem with ScenegraphIO, but it does not seem to have the symptoms that you describe.
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