R3.D3.SkyBox = function (
    graphics
) {
    this.id = null;
    
    this.graphics = graphics;
    this.graphics.isNotThreeThrow();
    
    this.texturesFolder = null;
};

R3.D3.SkyBox.prototype.load = function (
    texturesFolder
) {
    this.texturesFolder = texturesFolder;
    this.textures = [];
    this.materials = [];
    this.mesh = {};
    this.scene = new this.graphics.instance.Scene();
    this.textureCube = null;

    var textureLoader = new this.graphics.instance.TextureLoader();

    // this textures are used to display the skybox
    this.textures.push(textureLoader.load(this.texturesFolder + "px.png"));
    this.textures.push(textureLoader.load(this.texturesFolder + "nx.png"));
    this.textures.push(textureLoader.load(this.texturesFolder + "py.png"));
    this.textures.push(textureLoader.load(this.texturesFolder + "ny.png"));
    this.textures.push(textureLoader.load(this.texturesFolder + "pz.png"));
    this.textures.push(textureLoader.load(this.texturesFolder + "nz.png"));

    // assign textures to each cube face
    for (var i = 0; i < 6; i ++) {
        this.materials.push(new this.graphics.instance.MeshBasicMaterial({ map: this.textures[i] }));
    }

    // create cube geometry
    this.mesh = new this.graphics.instance.Mesh(new this.graphics.instance.CubeGeometry(1, 1, 1), new this.graphics.instance.MeshFaceMaterial(this.materials));
    this.mesh.applyMatrix(new this.graphics.instance.Matrix4().makeScale(1, 1, -1));
    this.scene.add(this.mesh);

    // Load env textureCube
    // this is used for reflections on meshes
    // mesh.material.envMap = this.textureCube;
    this.textureCube = new this.graphics.instance.CubeTextureLoader().load([
        this.texturesFolder + "px.png", this.texturesFolder + "nx.png",
        this.texturesFolder + "py.png", this.texturesFolder + "ny.png",
        this.texturesFolder + "pz.png", this.texturesFolder + "nz.png"
    ]);
};

R3.D3.SkyBox.prototype.render = function (
    threeRenderer,
    threeCamera
) {
    var cameraPosition = new this.graphics.instance.Vector3(threeCamera.position.x, threeCamera.position.y, threeCamera.position.z);

    threeCamera.position.set(0, 0, 0);

    var gl = threeRenderer.context;

    gl.disable(gl.DEPTH_TEST);

    threeRenderer.render(this.scene, threeCamera);

    gl.enable(gl.DEPTH_TEST);

    threeCamera.position.copy(cameraPosition);
};