Convert Wavefront .OBJ files to .USDZ from an iOS device in Swift.

With the introduction of the USDZ format and iOS 12, Apple provided guidance only for creating .usdz files using their macOS commandline tool:

xcrun usdz_converter Tyrannosaurus.obj Tyrannosaurus.usdz 
-g TyrannosaurusMesh
-color_map Tyrannosaurus_Color.png
-metallic_map Tyrannosaurus_Metallic.png
-roughness_map Tyrannosaurus_Roughness.png
-normal_map .  Tyrannosaurus_Normal.png
-emissive_map  Tyrannosaurus_Emissive.png

Thanks to the discovery from the folks at scandy, there is a means to create USDZ files from iOS itself.

Copy the MDLAsset+usdz.swift file into your Xcode project.

let objAsset = MDLAsset(url: objUrl)

let destinationFileUrl = URL(fileURLWithPath: "path/Scene.usdz")
objAsset.exportToUSDZ(destinationFileUrl: destinationFileUrl)

• USDZ Specification
• Pixar’s USD project
• scandy blog

obj2usdz is available under the MIT license, see the LICENSE file for more information.