To connect the value of one attribute to another with an expression
or
Select the node with the attribute you want to edit and select
. Click the attribute and type a MEL expression in the box at the bottom.For example, to make the translateX value of pTorus1 always equal the translateY value of pCone2, type =pCone2.translateY in pTorus1’s translateX box. When you move the cone up and down in Y, the torus moves side-to-side in X.
You can create more complex expressions using multiple attributes and MEL’s math functions.
When you type an expression into a text box in the Attribute Editor or Channel Box and press Enter, Maya shows the computed value with a purple background. You cannot edit values that are the result of an expression. To edit the expression, use the Expression Editor.