[osg-users] setLODScale affecting near far planes?

Paul Martz pmartz at skew-matrix.com
Fri Sep 19 15:57:18 PDT 2008

Do you get the same behavior when viewing your database in osgviewer and
hitting the * and / keys?

> Hi all,
> I am getting this rather weird effect when playing with the 
> setLODScale values in my application. I have a large pagedLOD 
> terrain, with near/far planes culling mode enabled for my 
> camera, and I am looking at a certain direction in the scene. 
> I added osg's lod scale handler so that I can modify the 
> value interactively (with the * and / keys, just like in
> osgviewer) and it turns out that as I change that value, and 
> I dump my application's debug information, I notice the the 
> near/far planes do not remain constant, although I am not 
> moving around the scene and I am always looking in the same 
> direction. This causes problems because the clipping planes 
> change as a result of changing the LOD scale and my non-LOD 
> objects beyond the planes get culled.  I don't think that the 
> clipping planes should change at all if I am not moving my 
> camera. I should still see the objects that are within a 
> constant near/far distance, and I should only observe 
> different level of detail on the LOD objects as I change the 
> scale. What am I missing here?
> I am using osg.2.6.0 on a 64bit intel linux machine. Thanks,
> -Jose
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