When I use the exporter with a material that has a texture map attached. It either exports with no material or the file wont be recognized by XCode or Apple's previewer. I assumed it was my asset, but when I downloaded the USDZ examples off Apple's website. They imported (using your importer) with the materials, but they do not export with the material. It only seems to work if I remove the texture maps and use the color sliders, but this wont work for the models I am trying to work on as I need the texture maps to export too. I tested this with using USDA and the USDZ converter, It did not work either.
When I use the exporter with a material that has a texture map attached. It either exports with no material or the file wont be recognized by XCode or Apple's previewer. I assumed it was my asset, but when I downloaded the USDZ examples off Apple's website. They imported (using your importer) with the materials, but they do not export with the material. It only seems to work if I remove the texture maps and use the color sliders, but this wont work for the models I am trying to work on as I need the texture maps to export too. I tested this with using USDA and the USDZ converter, It did not work either.