8

906 Chapter 8: Modifiers
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 modifiers to the object’s modifier stack,
each UV W Map mo difier 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 the modifier
stack and change the p arameters. You can change
thenameofaUVWMapmodifierintheEdit
Modifier Stack dialog to correlate 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,
rotate, 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 example, if you scale
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, c ylindrical and shrink w rap
maps,ashortyellowlineindicatesthetopofthe
map. Thegreenedgeofthegizmoindicatesthe
right side of the map. On a spherical or cylindrical
map the green edge is the seam where the left and
rig ht e dge meet. Gizmo must be selected in the
modifier display hierarchy to display the gizmo.
Gizmos for different projection types
Left to right: planar, cylindrical, box, and spherical
Effects of Transforming the UVW M ap Gizmo
Moving the gizmo changes the center of projection
and affects all types of mapping. Rotating the
gizmo changes the orientation of the map, which
affectsalltypesofmapping.Uniformscalingdoes
not affect spherical or shrink-wrap mapping.
Non-uniform scaling affects all types of mapping.
If you scale a gizmo smaller than the geometry,
then a t iling effect is created, unless scaling has
no effect on t he map type in use. Tiling based on
gizmo size is in addition to tiling values set in the
Material Editor Coordinates rollout for the map or
theUVWMapmodifiertilecontrols.
The size of the gizmo affects how the mapping is applied
to an object.