feat(pbrmodel): experimental access to material range and mgr
feat(pbrmodel): experimental access to material range and mgr

stardazed/stardazed,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,stardazed/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,stardazed/stardazed,zenmumbler/libzm