Two side textured

hi all i try to made a simple square with two side texture, but when i look to the back side of the quad a can’t see anything :S any clue? here is the code

[java]
Quad quadDebris = new Quad(5,5);
Geometry geometryDebris = new Geometry(“A Textured Box”, quadDebris);

Material mat1 = assetManager.loadMaterial("Materials/baseR.j3m");
geometryDebris.setMaterial(mat1);
geometryDebris.setLocalTranslation(0,0,0);
//Quaternion YAW180   = new Quaternion().fromAngleAxis(FastMath.PI  ,   new Vector3f(0,0,1));
//geometryDebris.setLocalRotation(YAW180);
geometryDebris.setLocalScale(0.5f, 1.0f, 1.0f); 
TangentBinormalGenerator.generate(geometryDebris);
rootNode.attachChild(geometryDebris);

[/java]

This is because jME only renders front facing polygons by default

[java]mat1.getAdditionalRenderState().setFaceCullMode(FaceCullMode.Off);[/java]

Note that if the material is lit then the back face will be lit backwards.

thanks guys!