I want to create a box that has different textrures on each side of it. Is there a material definition that will allow this?
Or is there information on how I can create my own?
You must to create a uv texture map to your cube like that:
Then you have to use a material that that support uv texture mapping. You can create your uv texture maps in a 3d modeling software like blender. You can use the lightning material or any other that support uv texture mapping : https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:advanced:materials_overview