Re: [Maya2osg-users] Winding again!

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

Hi, found the place ( code ) of confusion, Line 281 in Mesh.cpp

     // Revert normals if opposite (needed for correct lihgting when 
using FFP)
     // If we are using GLSL instead of FFP, we do not reverse the 
normals because
     // it is already done in the shader
     bool reverse_normals = !Config::instance() -> getArgBool( 
"-useGLSL" ) && !doubleSided(mDagPath.node()) && opposite(mDagPath.node());
     float normalDirection = ( reverse_normals ? -1.0f : 1.0f ) ;

What to do about it ? I think we should keep the setting, but need to 
switch the culling ( backface, frontface ) as well, and that shoud fix 
J-S issue, right ?

Cheers, PP

>
> On Wed, Oct 19, 2011 at 9:41 AM, PP CG <pp...@cg... 
> <mailto:pp...@cg...>> wrote:
>
>     Hi guys,
>
>     >   I don't remember why is this "flip normals if surface mode is
>     > opposite" option required. Probably Peter explained it to me
>     some time
>     > ago, but I don't remember. It was supposed to work automatically in
>     > FFP as well as in GLSL mode.
>     >
>     >   Peter can you throw some light here?
>
>     When I added this option I thought one could save a StateSet
>     change when
>     some surfaces have backface culling and some frontface culling. But
>     AFAIK we figured that it was not working correctly, and removed this
>     option from the UI.
>     @Javier, I think you needed it only for one special case ( Shders ? ).
>
>
>   I think I don't need it. It wasnt originally in the export options. 
> The opposite flag was checked in FFP as well as in GLSL. There were 
> some bugs about this some time ago, but I thought I solved them. I'll 
> take a look at it as soon as I can, to check if it is working OK.
>
>
>   Regards,
>
> -- 
> Javier Taibo
>
>
>
>
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