Class CM3LayerBackgrounds extends CMLayerBackgrounds

CM3LayerList Class

The CM3LayerList inherits from CMLayerList so it needs to mix in the CMTHREEHelper
class to provide a THREE.js group for the layers to sit within. The same is true
for the CM3LayerBackgrounds class.


Copyright (C) 2020, Humboldt State University, Jim Graham

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General
Public License as published by the Free Software Foundation, either version 3 of the License, or (at your
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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