This is a screenshot from Apple\'s Fox sample code. As you can see, they use .scn file format for graphics object. They explicitly state in the wwdc2015 video that this was
Exporting the .dae is unnecessary; you can place the object directly into a .scn file:
.dae
.scn
Create the new .scn file in the .scnassets folder, then drag the .dae file into the scene.
.scnassets