I'm creating a 3D-model of a traffic sign for a simulation software. The problem is, that within the simulation I get some strange texture errors:
From the simulation-tool-support I got this response:
Your faces seem to be coplanar and double-sided. Make sure they have proper single-side modeling and that the normals point into the right direction.
In the screenshot you can see, that the normals look right, and the faces are not two sided:
How can I create a material, which is only visible from one side? The model is exported using the obj format and is then converted to flt using osgconv.

