Re: [Maya2osg-users] Triangle winding question (maya usage)

[Javier T. <jav...@gm...>]

  Hi J-S,

  Just a quick answer, without thinking too much...  O:)

  Take a look at:

  Mesh > Cleanup (especially the "Nonmanifold geometry" option in "Remove
Geometry" section)
  Normals > Conform

  I don't know if any of this is going to solve your problem, but these are
the first places I would look.

  Just my two cents... good luck!


  Regards,


On Fri, Oct 14, 2011 at 7:13 PM, Jean-Sébastien Guay <
jea...@cm...> wrote:

> Hi guys,
>
> This is a Maya usage question... Hope you don't mind.
>
> Our modelers often create symmetric pieces by first creating half, then
> duplicating that half, scaling it by -1, reversing the normals and then
> freezing the transforms.
>
> This seems to work fine, at least in Maya, except that I notice now that
> triangle winding (vertex order) is still inversed when they do that.
> This manifests itself in two ways in our realtime app: Lighting
> considers the wrong side of a face (light seems to come from the
> opposite side) and backface culling is reversed (faces are culled when
> looking from the outside instead of from the inside).
>
> I wonder, is there a way in Maya to reverse the triangle winding? I can
> write a script (or search the net for one), but is there something
> built-in?
>
> I was thinking of writing a script that would go through all polygons of
> a model and compare the "implicit normal" (calculate a normal using the
> vertex order in the triangle) to the saved normal (in the normal array)
> and if it doesn't point in roughly the same direction, reverse the
> vertex order. This assumes that the artist has made his normals all
> point in the correct direction, so the normals are used as reference to
> correct the triangle winding. I could then put this script on preExport
> in the plugin.
>
> My question is really, do I have to do this myself or is there something
> already there I can use?
>
> Thanks in advance,
>
> J-S
> --
> ______________________________________________________
> Jean-Sébastien Guay    jea...@cm...
>                                http://www.cm-labs.com/
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-- 
Javier Taibo