[Maya2osg-users] Winding again!

[Jean-Sébastien G. <jea...@cm...>]

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! :-)

Thanks,

J-S
-- 
______________________________________________________
Jean-Sébastien Guay    jea...@cm...
                                http://www.cm-labs.com/
                     http://whitestar02.dyndns-web.com/