Control primitives using sliders and expressions

You can use slider controls and expressions to modify and generate values for primitive and Modifier attributes. You can use any combination of expressions and slider control to specify how primitives appear and behave. For example, you set a primitive's Length using a slider control then set its Width using an expression. See Expressions overview.

1. In the Create XGen Description window, select options for the following:
   • What kind of Primitives are made by this Description ?.
   • Generate the Primitives
2. For Control the Primitives by, select Using Attributes controlled by Expressions.
   NoteIf you select Placing Guides, you can use slider controls and expressions to set attribute values. First place the guides on the mesh surface, then set the primitive attribute values.
3. Click Create.

   XGen creates a new Description.

4. In the XGen Window, click the Primitives tab.

   Modifiable attributes for the current primitive type display in the window.

5. To modify an attribute value, do one of the following:
   • Use the available slider control.
   • Type an expression in the attribute field.
   • Click the icon to create a new expression in the XGen Expression Editor.
   • To load a saved expression, click the , select Load Expression then the expression you want to load from the menus that appears.

     You can also select Create a Map from the menu and control the attribute values using a PTEX map, see Control primitives with PTEX maps.

6. Preview the results. See Preview generated primitives.

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