code: public static Geometry createCube(Vector3f dimensions, ColorRGBA color) {
          checkInit();
          
          Box b = new Box(dimensions.getX(), dimensions.getY(), dimensions.getZ()); // create cube shape at the origin
          Geometry geom = new Geometry("Box", b);  // create cube geometry from the shape
          Material mat = new Material(assetManager,
                  "Common/MatDefs/Misc/Unshaded.j3md");  // create a simple material
          mat.setColor("Color", color);   // set color of material to blue
          geom.setMaterial(mat);                   // set the cube's material
          return geom;
      }
docs: Creates a cube given its dimensions and its color
  
  @param dimensions
  @param color
  @return a cube Geometry