I will post all issues concerning the openflight export function here: Texture uvw mappings "beyond the edge" is incorrect in the openflight model Double sided textures (as defined in the FSX material parameters) seems not to be converted into the openflight model What I mean with beyond the edge is the technique used when we want to achieve repeatitive tiling. E.g. for a fence, we just extend the right edge to U=20.0 in order to have 20 "fence tiles" on the polygon. I think you get the idea In the openflight model, only the portion within the [0.0...1.0] uv-intervals are correctly displayed, the rest of the polygon is just a streched mess. In the mdl tweaker tool, it works.