2008

Process
When 3ds Max imports a DWG file from AutoCAD or Revit Architecture
(version 2008 and later) with either the Layer, Blocks as Node Hierarchy, Split
by Material” or the Entity, Blocks as Node Hierarchy derivation methods,
multiple material IDs are readable and editable as Multi/Sub-Object materials
in the Material Editor.
3ds Max reads each face of an imported AutoCAD/Revit solid to determine if
it contains any material IDs that can be imported. If the program reads more
than one material ID from a solid, it translates each material ID on import
and re-assigns it to the object.
The program creates Multi/Sub-Object materials only if it finds more than one
material ID; if an ACIS solid contains only one material ID, 3ds Max creates
and assigns a standard/architectural material instead.
NOTE 3ds Max first evaluates the imported file to find any Revit material IDs, and
then looks for AutoCAD material IDs.
NOTE If you import a DWG file with the Layer, Blocks as Node Hierarchy, Split by
Materials derivation method, it does not split the solid to reflect its materials set.
Multi/Sub-Object Material Naming
In earlier versions, 3ds Max read the material ID information from the color
ID of the AutoCAD/Revit material ID’s face. Now, it creates a Multi/Sub object
material for every translated per face material ID each time you import a DWG
file that contains an AutoCAD/Revit solid.
When the program finds multiple materials assigned to an ACIS solid and
creates a Multi/Sub-Object material, the Multi/Sub-Object material consists
of instances of standard architectural scene materials.
Naming Conflicts
Material IDs are unique within one DWG file. However, the same material ID
may appear in two different files, such as Basic Wall: Generic – 12” Masonry.
If a naming conflict arises when two scenes are merged, the program applies
the last loaded material used in the Multi/Sub object material.
For example, if you import two files, file1.dwg and file2.dwg, and they both
contain a material named Brick; the Brick material used is the one from the
second file (file2.dwg).
AutoCAD (DWG) Files | 6981