User Manual

Table Of Contents
Cubic Spline
The Cubic Spline is another animation modifier in Fusion that is normally applied to numerical
values rather than point values. It can be applied by right-clicking a numerical control and
selecting Modify With > Natural Cubic Spline.
Usage
Being an animation spline, this modifier has no actual Controls tab. However, its effect can be
seen and influenced in the Spline Editor.
Expression
An expression is a variable or a mathematical calculation added to a parameter, rather than a
straight numeric value. You can add an expression to any parameter in Fusion, or you can add
the Expression modifier, which adds several tabs to the modifier Inspector. Adding this modifier
to a parameter adds the ability to manipulate that parameter based on any number of controls,
either positional or value-based. This modifier offers exceptional flexibility compared to the
more limited Calculation or Offset modifiers, but it is unable to access values from frames other
than the current time.
The Expression modifier accepts nine value inputs and nine position inputs that are used as
part of a user-defined mathematical expression to output a value.
To add the Expression modifier to a parameter, right-click the parameter in the Inspector and
choose Modify With > Expression from the contextual menu. The type of value returned by the
Expression depends entirely on the type of control it is modifying.
When used with a value control (like a slider), the Expression in the Number Out tab is
evaluated to create the result. When used to modify a positional control (like Center), the Point
Out tab controls the result.
The Inspector’s Modifiers tab contains the controls for the Expression modifier,
described below.
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