johanos

What do you mean exactly? From what I understand the primitives are part of the mesh object. which point to indices and materials. but mesh[0] defines a mesh with geometry...

What you can try to do to debug this further is use the SceneKit write function https://developer.apple.com/documentation/scenekit/scnscene/1523577-write to write your scene to a file, you'll lose references to things like...

its working on the newest version of iOS, can't check macOS because i can't update my computer yet but it seems like this isn't an issue after all :)

sidebar update: https://emackey.github.io/testing-pbr/normal-tangent-readme.html here's a nice write up as to why this is important. sadly I can't work on this until I can update my computer (not up to me)...