The command in the expression editor inserts the token at the insertion point in the editing pane. This token evaluates the function curve of any parameter at a given frame. Replace
the dummy arguments as follows:
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Replace with an expression that defines the frame at which you want to evaluate a parameter.
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Replace with the name of the parameter to be evaluated. You can use the Object and Param buttons to assist you in entering
a parameter name, or you can type a parameter name in directly.
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Example
at_frame( Fc-30, sphere.kine.local.posy)
Returns the local Y translation of sphere at 30 frames before the current frame.
Time