Well, after I saw that example for a SkySphere in the effects testeverything,
I really wonder how to create a Skybox?
just replacing the sphere with a box and settings the SphereMap to false did nto do the trick.
Box sky = new Box(new Vector3f(0,0,0),1,1,1);
skyGeom = new Geometry("Sky", sky);
skyGeom.setQueueBucket(Bucket.Sky);
skyGeom.setShadowMode(ShadowMode.Off);
skyGeom.updateModelBound();
skyGeom.setCullHint(CullHint.Never);
Texture envMap = Core.getManager().loadTexture(
"Textures/Sky/St Peters/StPeters.jpg");
Material skyMat = new Material(Core.getManager(),
"Common/MatDefs/Misc/Sky.j3md");
skyMat.setBoolean("m_SphereMap", false);
skyMat.setTexture("m_Texture", envMap);
skyMat.setVector3("m_NormalScale", new Vector3f(-1, 1, -1));
skyGeom.setMaterial(skyMat);
Core.getVisiblenode().attachChild(skyGeom);