[osg-users] LOD Node

Chris 'Xenon' Hanson xenon at alphapixel.com
Sun Apr 3 08:32:08 PDT 2011

On 4/3/2011 9:27 AM, Martin Haffner wrote:
> 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?

  I think so.

  But, I could be wrong. It should be pretty easy to put some breakpoints inside the LOD
code and watch exactly what happens.

Chris 'Xenon' Hanson, omo sanza lettere. Xenon at AlphaPixel.com http://www.alphapixel.com/
  Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting.
    "There is no Truth. There is only Perception. To Perceive is to Exist." - Xen

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