How to "rotate" meshes to "face" the other way?

Question

3D

After transferring the model to Unity dae (collada), some of the meshes "turned around" to face the other side. What is the fastest or best way to "turn" them back?

Answer 1

It's not entirely clear what "turned around" means, if you have a problem with normals, then try re-exporting. Usually in the export window there is an option "Fix Normals / Recalculate Normals" or something like that.