Expressions rollout:
Sometimes mapping the points from 2D domain into 3D space needs to do several tasks and operations for each point. in this case you can organize these operations as sequenced expressions and place them inside the expression rollout in order that they must be performed. You can use functions and parameters to make the expressions in composition of “u” and “v”. For example we suppose that  is a part X,Y & Z definition.

In this situation we hold that
 As an expression and the rest would be:

Note 1: All expression will execute in global scope.

Note 2: expressions must be in order from top to button.

 To add an Expression, press the button from Expressions rollout.

To edit an existing expression, simply change the expression in the text field.

To delete an expression press the button.