BeLight Software today released Live Interior 3D 1.2, an update to its new software for Mac OS X that lets users design house, office, apartment, and other interiors with realistic 3D walkthroughs. The update adds multi-level grouping functionality, 50+ new objects and 50+ new materials, interface changes and improvements. This update is free for all Live Interior 3D users. Live Interior 3D is priced at US$79.95 and a free demo is available.