Documentation for data from room plan captured room surfaces

I can not find any documentation on how to interpret and use the data in the returned scan data objects. Specifically, in the captured room wall surfaces.

Look at the USDZ Specifications for information for most of the data. The problem there is that there is data carried in the file the is proprietary to Apple and only the Apple sanctioned apps seem to be able to process it. Am I correct?

Documentation for data from room plan captured room surfaces
 
 
Q