Re: [info-performer] WGS84 (psi,theta,phi) -> local performer hpr?

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From: Serge Kourdakov (serge++at++vrtainment.com)
Date: 08/29/2002 08:00:06

Sorry my mail system reports delivery error and I resend a message. sorry
if there will be two replies from me ...
after mail system will recover ....

Hi Ken

you wrote.

-----------------------------------------------------

Given psi,theta and phi (in WGS84 coords) and a local lat/lon, does
anybody have a good algorithm for calculating the flatearth HPR for
performer? I've searched the archives and found several references on
converting wgs and lat,lon to xyz, but I haven't been able to find any
references to converting the orientation. Thanks.
------------------------------------------------------

My idea is that though angles could be different

http://mathworld.wolfram.com/EulerAngles.html

or

http://users.ece.gatech.edu/~slabaugh/personal/research/euler/euler.pdf

etc ....

 the resulting cosine direction matrix should be the same (though just maybe
I'm wrong ..).

Thus you might compute cosine direction matrix in one set of angles .

Then extract angles in another way to present rotations ...

So take a look at pdf for some hints how to extract angles for the matrix..

And the way might be such as - using your psi,theta and phi you get a
matrix as described in

http://users.ece.gatech.edu/~slabaugh/personal/research/euler/euler.pdf

then using procedure like described in this doc extract angles for Performer
rotation matrix....

Regards
Serge
http://www.vrtainment.de

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