Working at the Sub-Object Level
 
 
 

To achieve highly detailed modeling effects, you can directly transform, modify, and align the geometry of objects at the sub-object level.

Sub-objects are the pieces that make up objects, such as vertices and faces. You can also access and transform the sub-object components of modifiers.

The particular geometry or gizmo available at sub-object level depends on the object type or modifier. For details on sub-objects for each object type, see Edit Modifiers and Editable Objects. For information on modifier sub-objects, see the topic for the modifier in question.

In a row of column sub-objects, a single column has been modified at the sub-object level.

Play this to see some examples of sub-object editing:

Selecting Sub-Objects

In selecting sub-object geometry, you use standard techniques:

Following is a general procedure in setting up an object for sub-object selection. See Edit Modifiers and Editable Objects for more information.

  1. Convert the object into an editable object such as an editable mesh, editable spline, editable poly, and so on. (Some modifiers you can apply to the object, such as Edit Mesh, Mesh Select or Spline Select, also have sub-object levels.)
    TipWork in a wireframe viewport so you can see the geometry.
  2. On the modifier stack display, click (the plus-sign icon to the left of the name of the modifier or editable object). This expands the object's hierarchy, showing the names of the sub-object levels at which you can work.
  3. On the stack display, choose the kind of sub-object geometry you want to work with: for example, Vertex, Face, or Edge. Each sub-object selection level has rollouts with their own sets of options.

    The sub-object level highlight is yellow by default.

  4. Use standard selection techniques (see preceding) to select sub-object geometry, from a single sub-object to the entire object. By default, the sub-object selection highlights in red.

Once you’ve made a sub-object selection, you can use the Spacebar to lock the selection while you’re working with it.

Storing Sub-Object Selection Sets

With any surface format (mesh, poly, and so on), you can store separate selections for each sub-object level: vertex, edge, and so on (there is overlap in some cases, such as poly edge and border). These selection sets are saved with the file. With sub-object selections, you have these options:

Using Sub-Object Selections

Once you make a sub-object selection of geometry, you can do any of the following:

Transforming a Sub-Object Selection

Using an editable mesh, poly, patch, or spline, you can directly transform any sub-object selection. However, “Select” modifiers like Mesh Select and Spline Select enable only selection.

To transform a sub-object selection made with a Select modifier:

  1. Add an XForm modifier to the stack, following (or somewhere above) the Select modifier.
  2. In the stack, open the Select modifier and make a sub-object selection.
  3. Choose XForm in the stack. You then transform the XForm gizmo, which applies the transform to the selection.

Cloning Sub-Object Geometry

Using Shift+transform with a selection of vertices or faces displays the Clone Part Of Mesh dialog. This lets you choose whether to clone to a separate object or an element. Click the desired option, optionally giving the cloned object a new name, then click OK.

Animating Sub-Object Geometry

When you work with an editable mesh, you can directly transform and animate a sub-object selection. In effect, the selection works like any other object.

See Also