Re: HPR addition?

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 07 Jul 1998 11:03:36 -0700

Eric Heft wrote:
>
> Hi,
>
> Simply stated I have two hpr's and need to add them together.
> I know its not as simple as pfAddVec3(hpr1,hpr2).
>
> Background:
> In a flight simulator I have the aircraft's xyz,hpr. The pilot is in
> a head tracked HMD so to get the camera in the correct place I need to
> add the trackers hpr to the aircrafts hpr.
>
> Thank you for your help.
> Eric
>
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You should build two matrices one with the hpr and translation of the
vehicle the other with the hpr and translation of the pilot multiply
them together and use that to specify the channel matrix.

The multiplication order is critical.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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