Re: Iv loader

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Dirk Luesebrink (crux++at++artcom.de)
Tue, 02 Sep 1997 17:31:50 -0400

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simple thing, the loader puts the whole scene under a rotation matrix to
rotate the scene from inventor(opengl,irisgl, softimage, and many more)
space to Performer space. nearby all grafix systems define Y as the
natural up axis and the camera looking down the negative z axis,
standing in zero. performer has Z has the up axis. this means the loader
puts a 90 degree rotation around the x-axis on top of the scene graph.
some other 'steps' in the process can than remove this pfDCS and render
the rotation into the geometry. look man pfFlatten.
i guess that was to please the tank driving folks, they traditionally
use a coordinate system where X is right, Y is forward or north and the
remaining third coordinate was later used for height. like on maps.
thank good its a right handed coordinate system, at least.

dirk.

Amaury Aubel wrote:
>
> Hi fellow Performers,
>
> Does the iv loader perform any axis swapping or anything of the like, that
> could account for a strange orientation of .iv objects?
> I get different orientations when converting iv files to other formats.
> I know that the iv loader's code is shipped with Performer but I could not find
> any trace of such stuff there...
>
> Many thanks for any hint,
>
> Amaury.
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Next message: Scott McMillan: "Re: Iv loader"
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