[Papervision3D] Faces flipped on collada model

[Andromedus]

Hi folks,

I'm using skethup to create my 3d models and importing them into pv3d 2.0
via the Collada class.  I'm finding that some of the ploygons, but not all
of them, are facing the wrong way.  As I am rendering one side only, this
has the effect of making those faces which are textured on the wrong side
invisible, and my model appears to have holes in it.  I have tried turning
the model inside-out using a negative scale value, but this just has the
effect of making different faces flipped the wrong way.  I also tried
switching between left and right handed coordinate systems, but that didn't
help either.

At the moment, my only solution is, in the modeller, to deliberately texture
the wrong side of each polygon that doesn't render the right way around. 
But on complex models this is getting really tediuos!  Does anyone have an
idea of what might be happening?

Cheers,

Ric. :)
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