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After setting an expression that generates animation, you can open the Spline Editor to view the values plotted out over time. This is a good way to check how your SimpleExpression evaluates over time.
A sine wave in the Spline Editor, generated by the expression used for Text1: Size
For more information about writing Simple Expressions, see the Fusion Studio Scripting Guide, and the official Lua documentation.
Pick Whipping to Create an Expression
With a SimpleExpression field open, a + button is displayed on the left side. Dragging the + button onto another control, or "pick whipping," links the two parameters, similar to the Connect To menu. However, unlike a Connect To parameter link, the pick whip allows you to modify the connection by further editing the expression.
Pick whipping to connect one parameter to another quickly
SimpleExpressions can also be created and edited within the Spline Editor. Right-click on the parameter in the Spline Editor and select Set SimpleExpression from the contextual menu. The SimpleExpression will be plotted in the Spline Editor, allowing you to see the result over time.