Update README.md

scripts/rendering/README.md

@@ -45,3 +45,5 @@ After setup, you can render objects using the `main.py` script:
 python3 main.py
 ```
 
+USDZ support is experimental. Since Blender does not natively support usdz, we use [this Blender addon](https://github.com/robmcrosby/BlenderUSDZ), but it doesn't work with all types of USDZs. If you have a better solution, PRs are very much welcome 😄!
+