Meta Creations: http://www.metacreations.com
Painter 3D allows you to interactively paint texture, bump, highlight, reflection and glow properties directly on 3D models. It includes advanced brush capabilities with over 100 Natural-Media brushes and image-editing effects, and advanced compositing controls with support for multiple floating selections which can be modified directly on the surface of 3D models.
For Painter 3D: http://www.tutorialfind.com/tutorials/corel/painter/3d/
Mac World Reviews: http://www.macworld.com/1998/07/reviews/4385.html