Thanks for your fast reply!

Ok, lets say I have 2 matrix transform nodes. One makes a huge translate to the 
right (x axis) and the other a huge translation fo the left. Each matrix 
transform node has one geode as a child, which renders a tree.

If I add these 2 matrix transform to a LOD node (at ranges (0,100) and 
(100,1000)), then the following happens: The bounding spheres of the geodes are 
propagated upwards to the matrix transform nodes. The bounding spheres are 
again propagated upwards to the LOD node and a new big sphere is computed with 
encloses both bounding spheres (in other words: the LOD node now has a huge 
sphere that encases both tree bounding spheres).
The distances (0,100,1000) always mean: The distance from the camera to the 
center of the LOD sphere.

Is this correct?

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http://forum.openscenegraph.org/viewtopic.php?p=38181#38181





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