Re: LOD Ranges / FOV

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Mario Veraart (rioj7++at++fel.tno.nl)
Tue, 14 Oct 1997 11:56:36 +0200 (MET DST)

> Question 1:
> For which FOV value does the LOD range value mean *exactly* the distance
> between the eye position and the LOD's center ?
To my knowledge you should model the database so it looks as it should
be for a 1280x1024 window and a FOV set to 45 degrees.
>
> Question 2:
> What is the mathematical formula linking the LOD scale operated on range
> values, and the channel's FOV ?
For the LOD scale the pixel area covered by one square meter at a
certain distance is calculated. Taking into acount the window size and
FOV. Based on this area and the area taken in case of a 1280x1024 window 45
FOV a scale factor is determined.

Mario
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