There’s a new iPhone/iPad app out that enables visualization of large 3D models in several popular formats like STL, OBJ, and PLY.  From a LinkedIn Post:

The application has been developed by the Visual Computing Lab a research group of the Italian National Research Council (CNR) , the same team that has developed MeshLab, the leading open source mesh processing system. We are going to add, in the next versions, more and more advanced and innovative features to make it become a powerful tool for the presentation, inspection, analysis and review of 3D objects.

It’s an impressive app, similar to Kitware’s KiwiViewer, although this supports more model formats (PLY being my personal favorite addition) and much larger models (up to 2million faces).  A free download for both iPhone and iPad.

via MeshLab for iOS for iPhone 3GS, iPhone 4, iPod touch (3rd generation), iPod touch (4th generation), and iPad on the iTunes App Store.