Re: perfly question

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Jenny Zhao (zhz++at++dandan.engr.sgi.com)
Thu, 26 Mar 1998 22:45:47 -0800

On Mar 25, 11:45pm, Steve Baker wrote:
> Subject: Re: perfly question
> On Wed, 25 Mar 1998, 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.
>
> That is the default action in Performer (not just Perfly) there
> *is* a call to change that behaviour - I forget what it is right now.

LOD scale behavior can be modified by LODState attributes.
you can modify the geometric range, and channel stress, etc.
in addition, 2.2 allows you to affect the FOV influence on LOD scale
by setting PFLODSTATE_RANGE_FOVOFFSET and PFLODSTATE_RANGE_FOVSCALE
using pfLODStateAttr(...).

-- 




Jenny Zhao                                   
zhz++at++engr.sgi.com                    
650 933-5091 (Voice)           
650 965-2658 (Fax)         
Silicon Graphics - IRIS Performer      
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