[osg-users] Transform RangeMode From PIXEL_SIZE_ON_SCREEN to DISTANCE_FROM_EYE_POINT

[Mouming Ning]

Hi,

Anyone know how to transform RangeMode from  PIXEL_SIZE_ON_SCREEN to DISTANCE_FROM_EYE_POINT?
I found ：required_range = cullStack->clampedPixelSize(getBound()) / cullStack->getLODScale() in the source code ,and it means required_range = radius/(center*pixelSizeVector) /LODScale;
but i donot know the meaning of  pixelSizeVector and the LODScale.
I need the formula，please~~

Thank you!

Cheers,
Mouming

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http://forum.openscenegraph.org/viewtopic.php?p=73275#73275