Not sure if it was already mentioned, but if your mesh is not loaded with LoadAnimMEsh (and I assume it isn't, it's rather created at runtime, right?) and if it has mutliple Surfaces, it will be rendered completely, even if only one surface is in the FOV of the camera. But if you have a mesh per surface, fustrum culling will skip rendering of any mesh that isnt in the FOV of the camera.