Re: perfly question

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Ran Yakir (rany++at++bvr.co.il)
Thu, 26 Mar 1998 08:16:19 +0200

Lee Willis wrote:

> Hi pfFolks,
>
> Does perfly automatically modify the LOD scale factor when one changes the
> field-of-view,
> perhaps as a load-management feature? We have a database that when we
> widen the FOV
> past 60 degrees, some of our LODs change.
>

Hi

This is normal behaviour, as described in the man page for pfChannel:

     IRIS Performer level-of-detail behavior is primarily dependent on
     pfChannel viewing parameters such as view position, field-of-view, and
     viewport pixel size. IRIS Performer assumes that LODs are modeled for a

     canonical FOV of 45 degrees and a viewport size of 1024 pixels. IRIS
     Performer computes an internal scale value for pfChannels whose FOV or
     viewport size differ from these defaults. This scale value is used to
     modify LOD ranges so that correct LOD behavior is maintained. If your
     LODs were not modeled with the above defaults you may use PFLOD_SCALE
     (see below) to adjust the LOD ranges.

Ran

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