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Part III: Modeling Basics

FIGURE 11.25
The Taper modifier can be used to create a simple yo-yo.

Substitute modifier
The Substitute modifier lets you place an object in the scene and substitute it with a higher-resolution
object during render time. The substitute object may come from the scene or from an XRef file. To remove
the substitute object, simply remove the Substitute modifier from the stack.

XForm modifier
The XForm modifier enables you to apply transforms such as Move, Rotate, and Scale to objects and/or sub-
objects. This modifier is applied by means of a gizmo that can be transformed using the transform buttons
on the main toolbar. The XForm modifier has no parameters.
The XForm modifier solves a tricky problem that occurs during modeling. The problem happens when you
scale, link, and animate objects in the scene, only to notice that the objects distort as they move. The distor-
tion is caused because the transforms are the last action in the stack to be performed. So, when the object was
first scaled and modifiers were applied, if you used the XForm modifier to do the scale transformation in the
stack before the modifiers were applied, then the object’s children won’t inherit the scale transformation.

Note
XForm is short for the word transform. n

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