Converting Units Automatically when Merging Files

When Respect System Units in Files is on in the Units Setup dialog, in the System Unit Scale group, merged objects from a file with a different scene unit scale are scaled to maintain their correct size in the new scene. No conversion is done when merging files created in 3ds Max 1.x.

Note: If Respect System Units is off (which is not recommended), a 100-foot radius sphere that was created in a 1 unit = 1 foot scene becomes a 100-inch sphere in a 1 unit = 1 inch scene.