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630 Chapter 8: Modifiers
Displace used to change the surface in the con tainer
There are two basic ways to use t he Displace
modifier:
• Apply displacement effects directly by setting
Strength and Decay values.
•Applythegrayscalecomponentofabitmapped
imagetogeneratethedisplacement.Lighter
colors in the 2D image push outward more
strongly than darker colors, resulting in a 3D
displacement of the geometry.
The Displace space warp (page 2–76) has similar
features. It’s useful for applying effect s to a large
number of objects or a particle system.
Top: Bitmap displacement on a patch and the bitmap used.
Bottom: Terrain effects using Displace
Force Distribution
Displace distributes its force through four different
gizmos: Planar, Cylindrical, Spherical, and
Shrink Wrap. Gizmos are also used as mapping
coordinates for applying bitmaps. Sphere and
Shrink Wrap have the same effect when modeling,
but d iffer in the way they map.
The Spherical and Shr in k Wrap gizmos begin
withauniformfieldaroundthem.TheCylinder
and Planar gizmos are both directional. Cylinder
pushes at rig ht angles to its axis, and Planar pushes
at right angles to its surface.