Three.js将静态背景添加到demo-earth.html？

Question

Three.js太棒了！我在向earth.html demo添加静态背景场景时遇到了麻烦。我尝试过使用CSS，这段代码

            var texture = new THREE.ImageUtils.loadTexture( 'rainier.jpg' );
            var backgroundMesh = new THREE.Mesh(
                new THREE.PlaneGeometry(2, 2, 0),
                new THREE.MeshBasicMaterial({ map: texture

                }));
            backgroundMesh .material.depthTest - false;
            backgroundMesh .material.depthWrite - false;

            //Background Scene

            var backgroundScene - new THREE.Scene();
            var backgroundCamera - new THREE.Camera();
            backgroundScene .add(backgroundCamera );
            backgroundScene .add(backgroundMesh );

无济于事！到目前为止，我已经成功地改变了球体的纹理。当我添加上面的代码时，它显示背景而没有球体？这是我第一次体验THREE.js。我开始修改演示以获得语法和操作的感觉。任何帮助将不胜感激！