I am getting the same issue. I need to save every model locally. No one delegate calling during scanning with room Plan Api.

Use every node of your usdz model and sort out their matrix. I create a clean floor plan graph structure in 2d with all matrix of nodes.

Thanks @bambamyi for your suggestion. Actually we are already using wall's height to get ceiling height but in few cases where ceiling is slanted/ hut type ( /\ ), at that point actual ceiling height is different than wall's height (.y). In coreModel at run time, we are getting exact variable name with ceiling height and its value, you can check while scanning, put breakpoint and explore CapturedRoom model.