A layer mask can turn any 
                    2D Generator
                    The part of a 2D layer that generates the image
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                     (including 
                     Image Layer
                    This generator loads a still image and displays it.
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Image Layer
                    This generator loads a still image and displays it.
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                     or 
                     Video File
                    
      Generate an animated image by playing a video file. Play it either with its
      Transport or from a Timeline (by drag n dropping the layer inside it)
    
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Video File
                    
      Generate an animated image by playing a video file. Play it either with its
      Transport or from a Timeline (by drag n dropping the layer inside it)
    
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                    ) into a 
                    2D TextureMask
                    Define a 2D Mask applicable on any 2D Renderer or 2D Modifier
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                    . Here for example, a mask based on 
                     Dots
                    Generate a dot grid
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Dots
                    Generate a dot grid
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                    :
 
                    
                    
                    The 
                    
                      Compo Mask
                     command is a shortcut to create a layer mask based on a 
                    Compo
                    Composite 2D Layer, Shape layer and 3D Layer together. [Ctrl] + [Shift] + [N] to create a new composition after opening Smode
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                    . This enable to use
				multiple 
                    2D Layer
                    A single 2D Layer
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                     to define the mask and even to define the mask using 
                    3D Layer
                    A single 3D Layer (3D object, particle system, ect)
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                    .
                    Here is an example of a mask defined through a 
                    3D Layer
                    A single 3D Layer (3D object, particle system, ect)
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                    :
