Re: [Flightgear-devel] Double sided in Blender

[Gary N. <gr...@gm...>]

Innis,

It sounds like some polygon normals are inverted. This is pretty
common after joins. After doing a join on objects in Blender, select
your object, go to Edit mode, and on the button bar find the Mesh
Tools More menu. From there, select Draw Normals. The normal is a line
perpendicular to the surface and extending outward from the center of
the polygon in the polygon's facing direction. Generally you want all
normals pointing out, indicating the facing sides are on the outside
of the object. I suspect you'll find some normals are not pointed the
right way.

To fix this, you can select the problem polygons and then: Mesh
Tools-->Normals-->Flip (also available from the specials key: w), or
you can also try to recalculate all the normals to face outside,
(ctrl-n in Windows). Usually ctrl-n does a pretty good job of
resetting normals of simple objects in the right direction.

Feel free to contact me off-list if I can be of more help.

-Gary, aka Buckaroo on MP


On Thu, Jun 11, 2009 at 11:23 PM, Innis Cunningham<in...@ho...> wrote:
> Hello All
> I am trying to build a hangar with Blender  2.48 not a hard task you might
> say
> but for some reason when I join two objects to one some of the sides become
> single sided that is they become transparent from one side in FG.If I leave
> them
> as separate objects they show double sided in FG.Does anyone know what I am
> doing wrong?.
>
> Cheers
> Innis
>
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