Get it.I will have a try.

In a way that a only a small part of the scene is lit ,like a spotlight
or put it another way,it's that there's parameter for GL_SPOT_CUTOFF in ES

Just like a light focus on a actor in the stage.
I think the Light in JPCE-AE is a pointolite like the sun, is there a way to make a Cone-Light?

yes, i make an obj for my ground and it works now.
I mistake the skybox

I add a skybox in my demo,and move the skybox-center.
But when i rotate the wolrd's camera,my model looks like under the skybox, why?
Am i mistake sth?
the code:
Build a skybox and move its center to make my model looks like is in the floor
SkyBox skyBox = new SkyBox("texture", "texture", "texture", "texture", "texture", "floor", 6000);
SimpleVector skyVector = new  SimpleVector(0, -2500, 0);
skyBox.setCenter(skyVector);

Rotate the camera in the world
float distance = camera.getPosition().distance(centerVector);
camera.moveCamera(Camera.CAMERA_MOVEIN, distance);
camera.rotateCameraX((float) Math.toRadians(60));
camera.moveCamera(Camera.CAMERA_MOVEOUT, distance);
camera.lookAt(centerVector);

The img:
Normal

Rotate

I want a background that it will be scale when i scale my model..but there's no obj/3ds models for me,just some imgs.

And one question, how to scale a model but keep its bottom's position?

When i move out the skybox's world-camera, it's all right at the beginning,but when move out for a distance, there's a blackground in the window.
Am i mistake sth?
And what should i do to move the model to the skybox's center?
Your reply will be very appreciate.
The code of the skybox
SkyBox skyBox = new SkyBox("texture", "texture", "texture", "texture",
"texture", "floor", 2000);
skyCamera = skyBox.getWorld().getCamera();
skyCamera.moveCamera(camera.getDirection(), scale * scaleCoef);
Img Normal:

The Bad: