This mask enables to apply a 
                    Function
                    Function that maps a number (percentage, time, etc.) to a value
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                     on top of an inner mask, in order to modify its behavior.
                    The "Mask - Function.compo" example shows a 
                    Radial mask
                    Mask defined through an ellipse
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                     that is modified by a sinus-shaped 
                    Parametric Function
                    A function that is defined by parameters (sine, square, noise, etc.)
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                    :
