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This script upgrades Maya's auto projection method from a maximum of 12 planes to 31 planes. That is a projection plane at every 30 degrees. This results in less distortion on the UVs and in most cases it creates a more logical layout (no weird angles). I mainly use this method for mechanical / hard surface objects where unfold UVs produces a less desirable result.
Usage: Select a polygon object or select polygon faces and then enter this command: sdv_autoMapping
Version History: v1.1 14 Sep 2008 Added support for multiple objects. Reduced the flickering in the uv window. v1.0 07 Mar 2007