Everything Is Black

Hey guys I am trying to make an app that I can generate a dice and throw it but when I try running the engine with this code everything is just black and I dont know why. I suspect it may be the models I am trying to use. Maby one of you can take a look.

`*
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    package mygame;

    import com.jme3.app.SimpleApplication;
    import com.jme3.bullet.BulletAppState;
    import com.jme3.bullet.control.RigidBodyControl;
    import com.jme3.font.BitmapText;
    import com.jme3.input.MouseInput;
    import com.jme3.input.controls.ActionListener;
    import com.jme3.input.controls.MouseButtonTrigger;
    import com.jme3.light.DirectionalLight;
    import com.jme3.light.PointLight;
    import com.jme3.material.Material;
    import com.jme3.math.ColorRGBA;
    import com.jme3.math.Vector3f;
    import com.jme3.scene.Geometry;
    import com.jme3.scene.Spatial;
    import com.jme3.scene.shape.Box;
    import com.jme3.scene.shape.Sphere;

    /**
     *
     * @author Shane.P.Drafahl
     */
    public class DiceSim extends SimpleApplication {

        public static void main(String[] args){
            DiceSim app = new DiceSim();
            app.start();
        }
        
        /** Prepare the Physics Application State (jBullet) */
      private BulletAppState bulletAppState;
     
      /** Prepare geometries and physical nodes for bricks and cannon balls. */ 
      private  RigidBodyControl dice_phy;
      private  Spatial dice;
      private  RigidBodyControl floor_phy;
      private  Spatial floor;
      

      
        @Override
        public void simpleInitApp() {
            //assets
            dice = assetManager.loadModel("Models/dice_0.scene");
            floor = assetManager.loadModel("Models/platform.scene");
            //physics stuff
            bulletAppState = new BulletAppState();
            stateManager.attach(bulletAppState);
            
            //Stuff to set camera location
            cam.setLocation(new Vector3f(6f, 20f, 6f));// 0, 4f,6f
            cam.lookAt(new Vector3f(2, 2, 0), Vector3f.UNIT_Y);
            
            //testing controls
            inputManager.addMapping("shoot", new MouseButtonTrigger(MouseInput.BUTTON_LEFT));
            initCrossHairs();
            platForm();
            
            //light
            DirectionalLight sun = new DirectionalLight();
            sun.setColor(ColorRGBA.White);
            sun.setDirection(new Vector3f(-.5f,-.5f,-.5f).normalizeLocal());
            rootNode.addLight(sun);
        }
        
        public void platForm(){
            this.rootNode.attachChild(floor);
            floor_phy = new RigidBodyControl(0.0f);
            floor.addControl(floor_phy);
            bulletAppState.getPhysicsSpace().add(floor_phy);
            
        }

        private ActionListener actionListener = new ActionListener() {
        public void onAction(String name, boolean keyPressed, float tpf) {
          if (name.equals("shoot") && !keyPressed) {
            throwDice();
          }
        }
      };
        public void throwDice(){
            this.rootNode.attachChild(dice);
            dice.setLocalTranslation(cam.getLocation());
            dice_phy = new RigidBodyControl(1f);
            dice.addControl(dice_phy);
            bulletAppState.getPhysicsSpace().add(dice_phy);
            dice_phy.setLinearVelocity(cam.getDirection().mult(25));
        }

        protected void initCrossHairs() {
            guiNode.detachAllChildren();
            guiFont = assetManager.loadFont("Interface/Fonts/Default.fnt");
            BitmapText ch = new BitmapText(guiFont, false);
            ch.setSize(guiFont.getCharSet().getRenderedSize() * 2);
            ch.setText("+");        
            ch.setLocalTranslation(
            settings.getWidth() / 2 - guiFont.getCharSet().getRenderedSize() / 3 * 2,
            settings.getHeight() / 2 + ch.getLineHeight() / 2, 0);
            guiNode.attachChild(ch);
      }
    }
`

try adding an ambient light to the root nde and looks around

Do the cross hairs show up?

the cross hairs show up, I already have a light source connected to the source node. When I open up my Models directory and try to open up one of my .scene files it says it cannot be located for some reason.

Have you tried importing the .scene to a .j3o?

It had an error when going from the .scene to .j3o so I tried doing it with a .blender file. it is still converting or it got stuck.

It says Please apply triangulation modifier in blender as a workaround and load again!