Autodesk , through its Youtube channel learning ” 3ds Max Learning Channel ” shares series consists of 3 videos with almost 30 minutes long, where management units in 3ds Max explained.
The first video shows generally the operation of the units within the program, both the Display Units (visual units) and the System of Units (system units).
The second presentation discusses the import of native files (.max) with different units, while the third video explains a similar process, but with other types of files, such as the .fbx.
Source: Max Underground
