Seems BM U3 is about to be released -https://docs.bentley.com/LiveContent/web/Bentley%20Map%20Help-v6/en/GUID-FCC7CFCD-2425-4436-AB82-7BEE440F33CD.html
The Help file erroneously mentioned that 3D Textures is included in UP3. This is not the case. Our apologies for this misinformation.