How to use

com.jme3.scene.debug.Grid

constructor

public void putGrid(Vector3f pos, ColorRGBA color){
  putShape(new Grid(6, 6, 0.2f), color, 1).center().move(pos);
}

rootNode.addLight(al);
Grid grid = new Grid(50, 50, 5);
Geometry gridGeom = new Geometry("grid", grid);
gridGeom.setMaterial(new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md"));

rootNode.addLight(al);
Grid grid = new Grid(50, 50, 5);
Geometry gridGeom = new Geometry("grid", grid);
gridGeom.setMaterial(new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md"));

  public static void attachWireFrameDebugGrid(AssetManager assetManager, Node n, Vector3f pos,
      Integer size, ColorRGBA color) {
    Geometry g = new Geometry("wireFrameDebugGrid", new Grid(size, size, 1.0f));  //1WU
    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    mat.getAdditionalRenderState().setWireframe(true);
    mat.setColor("Color", color);
    g.setMaterial(mat);
    g.center().move(pos);
    n.attachChild(g);
  }
}

  private static void attachGrid(Vector3f pos, float size, ColorRGBA color,
      AssetManager assetManager, Node rootNode) {
    Geometry g = new Geometry("wireframe grid", new Grid((int) size, (int) size, 1f));
    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    mat.getAdditionalRenderState().setWireframe(true);
    mat.setColor("Color", color);
    g.setMaterial(mat);
    g.center().move(pos);
    rootNode.attachChild(g);
  }
}