Re: Physical units used by Performer

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John Rohlf (jrohlf++at++tubes)
Thu, 12 Jan 95 11:54:28 PST

>
> Hi,
>
> Are the physical units used in Performer well defined? In a previous
> posting, Marcus Barnes of MultiGen Inc. (Dec 1994) said that the
> OpenFlight loader converts everything into meters. This seems to
> suggest that the Performer unit of distance is assumed to be meters.
>
> Or is it possible that Performer assumes no units in particular, and
> only the OpenFlight loader assumes meters?
>
> If the physical models used by Performer settle on a particular unit
> system, could the Performer folks state it clearly?
>
> Eric,
> Physical Unit ++at++ USA CERL, Champaign IL
> (217) 351-6511 x6363
> e-mail: erich++at++pike.cecer.army.mil
>

        Performer is unit-free except that pfGetTime() returns
the time in seconds, certain calls like pfGetPipeSize
use pixels, and we use degrees rather than radians.

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