Re: [Maya2osg-users] Winding again!

[PP CG <pp...@cg...>]

Hi J-S,

> Hi guys,
>
> I think I found the case where winding will affect surfaces.
>
> An object scaled by -1 will have its normals inverted and winding will
> be inverted too. Maya sets the "opposite" mode on this. It makes it look
> OK in Maya. If, in the plugin, I set "flip normals if surface mode is
> opposite", then the plugin will invert the normals (* -1) but the
> winding will still be wrong, so they will be culled by CULL_FACE even
> though lighting is correct.
>
> If I reverse the normals in Maya, my guess is that Maya also reverses
> winding, because then all is OK.
>
> So I think the plugin should warn when the surface mode is set to
> opposite AND single sided, as that will not work unless triangle winding
> is reversed (which is maybe too complex for an export plugin to do). At
> least with a warning artists can see there is a problem and fix it on
> the affected surfaces. If the data is wrong, fix the data! :-)

Wouldn't just reversing the Vertex or Element Arrays do trick ?

Cheers, PP