9

UVW Map Modif ier 923
the bitmap is rotated and projected so that it is
perpendicular to the surface.
Primitive objects, like spheres and boxes, can
generate their ow n mapping coordinates, as
can loft objects and NURBS surfaces. Scanned,
imported, or hand-constructed polygonal or pa tch
models do not have mapping coordinates until a
UVW Map modifier is applied.
Note: Drawings that are impor ted or linked from
Autodesk Architectural Desktop and Autodesk
Revit do retain the mapping coordinates that were
assigned to objects by those products.
If you apply a UVW Map modifier to an object
w ith built-in mapping coordinates, the applied
coordinatestakeprecedenceifmap channel (page
3–966) 1 in the UVW Map modifier is used. The
Generate Mapping Coordinates option, available
during the creation of primitives, uses map
channel 1 by default.
You use the UVW Map modifier to:
• Apply one of the seven types of mapping
coordinates to an object on a specified map
channel. A diffuse map on map channel 1 and a
bump map on map channel 2 can have different
mapping coordinates and can be cont rolled
separately by using two UVW Map modifiers
in the modifier stack
• Transform the mapping gizmo to adjust map
placement. Objects with built-in mapping
coordinates lack a gizmo.
• Apply mapping coordinates to an object with
no mapping coordinates, an imported mesh,
for example.
• Apply mapping at the sub-object level.
Map Channels
You can control the type of mapping coordinates
and the placement of the mapping gizmo for each
bitmap in a material that uses multiple bitmaps by
assigning explicit map channels to the bitmaps. In
the Material Editor you assign each map a different
channel number, then you add multiple UVW
Map m odifiers to the object’s modifier stack,
each UVW Map modifier is set to a different map
channel. To change the type of mapping or gizmo
placement for a particular bitmap, you select
one of the UVW Map modifiers in t he modifier
stack and change the parameters. You c an change
the name of a UVW Map modifier in the Edit
Modifier Stack dialog to correla te the modifier to
the bitmap.
Transfor ming UV W Map Gizmos
Changing a map’s location by moving the gizmo.
The UVW Map gizmo projects mapping
coordinates onto an object. You can position,
rota te, or scale a gizmo to adjust map coordinates
on an object; you can also animate the gizmo.
Gizmo transformations remain in effect if you
select a new map type. For exa mple, if you sc ale
a spherical mapping gizmo and then switch to
planar mapping, then the planar mapping gizmo
is also scaled.
Gizmo Display for Different Map Types
For planar, spherical, cylindrical and shrink wrap
maps, a short yellow line indicates the top of the
map. Thegreenedgeofthegizmoindicatesthe
right side of the map. On a spherical or cylindrical