A Material Bank allows you to organise your 
                    3D Renderer
                    Displays a 3D geometry
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                     and make reference to them
  instead of importing them in each 
                    3D Layer
                    A single 3D Layer (3D object, particle system, ect)
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                    .
  
                      This is acting just like a 
                    Shared Element
                    A shared element that can be reused at several places like an After Effects precomposition
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                    , but with multiple 3D renderers inside it.
  
                      Once you have a non-empty material bank, the last added 
                    3D Renderer
                    Displays a 3D geometry
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                     will be
  automatically referenced when creating a new 
                    3D Layer
                    A single 3D Layer (3D object, particle system, ect)
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                    .
  
                      It order to apply a renderer from a material bank to a 
                    3D Layer
                    A single 3D Layer (3D object, particle system, ect)
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                    ,
  just drag and drop the 
                    3D Renderer
                    Displays a 3D geometry
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                     on it.