Exporting to fbx version 7700 gives broken model
Scene scene = new Scene();
Node node1 = scene.RootNode.CreateChildNode("Node1");
node1.Transform.Rotation = Quaternion.FromEulerAngle( 0, 0, Math.PI );
node1.Entity = new Pyramid();
scene.Save( "model.fbx", FileFormat.FBX7700Binary );
Resulting model: model.fbx.zip (3.2 KB)