Layers are a way of hiding or making visible specific objects. The basic process is “to create a layer and then assign objects to the layer”. The layer can then be turned on or off, thus controlling the visibility of the objects in that layer.
A model can have any number of layers. This feature is particularly useful when cutting sections for which only the edges that intersect with the section plane are to be drawn.
Every new Sketch Up file contains a special layer called Layer 0.
All objects should be drawn on Layer 0 and then assigned to another layer. Always keep Layer 0 visible. If it contains objects that you want to hide, assign them to another layer.
Since the layer 0 is default layer and always available, the minimum allowable number of layers is 1.
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