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I have received Collada (DAE) files from several different 3D authoring tools (Rhino, Blender, Cinema4D, etc) and have found that sometimes the models fail to load. Xcode does not provide any information when a model fails to load. It simply shows an alert that says "The file couldn't be opened."
Are there any requirements -- specific DAE version, limited subset of features, etc -- that my 3D designer should be aware of when exporting a DAE file for me?
I have, of course, searched Apple's docs without finding any information on DAE requirements.
Avoid Collada version 1.5 (as far as I know only Cinema4D exports to 1.5 by default but it has an option to export 1.4). Collada 1.5 is not supported by SceneKit. Then, in my experience with Maya and 3DSMax, the "openCollada" exporter (free plugin) gives better results than the built-in exporters.