> I am also using an Ortho2D projection (field of view 30 degrees)

There is no such things as field of view for Ortho projection. 



> 
> So, Let me draw a specific scenario: an image pyramid, starting at scale 
> 0.125, going all the way up to 0.25, 0.5, 1.0.I am also using an Ortho2D 
> projection (field of view 30 degrees). The tiles are fixed size, and I know 
> their size in pixels.
> Can I use PIXEL_SIZE_ON_SCREEN for my purpose? 


I think you can try somethings like setRange(id, 0.5, 2); for every tiles.

I mean you already have tile for each resolution level so you just need to show 
the one which is the closest to 1:1.

You need ranges of [0..A], [A..B], [B..C] when using the DISTANCE_FROM_EYE.

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http://forum.openscenegraph.org/viewtopic.php?p=68601#68601





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