This mask is a Solid positioned with a 
                    2D Placement
                    Define a placement in 2D space
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                    . It has feather parameters that can operate on the four sides of the mask.
        
                            This mask can be used to create soft-edges when doing multiple video-projectors overlap. In this case, think to put the 
Gamma        parameter to a realistic value such as 2,2 for example.
        
                            Note that similar and more evolved masks can be obtained by combining a 
                    Layer mask
                    Turn any 2D generator into a mask
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                     with a 
                     Uniform
                    Generate a solid, uniform image, filled with a unique color
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Uniform
                    Generate a solid, uniform image, filled with a unique color
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                    .