Edit: fixed download link
Introduction:
InvToSP (Inventor to Substance Painter) is a script which prepares an Inventor CAD model for texturing in Substance Painter. It works around various bugs in 3ds Max, maintaining the explicit normals at all times.
The manual is in the InvToSP chapter in "Inventor for Game Design.pdf", which is located in the same rar file as the script.
Features:
-Significant workflow speedup.
-Automatically import high poly and low poly from supplied directory.
-Fix flipped faces using automated re-import.
-Dynamically adjust mesh resolution.