How to use the webgl-operate.Camera function in webgl-operate

protected onInitialize(context: Context, callback: Invalidate,
        /* mouseEventProvider: MouseEventProvider, */
        /* keyEventProvider: KeyEventProvider, */
        /* touchEventProvider: TouchEventProvider */): boolean {

        /* Create framebuffers, textures, and render buffers. */

        this._defaultFBO = new DefaultFramebuffer(this._context, 'DefaultFBO');
        this._defaultFBO.initialize();
        this._defaultFBO.bind();

        /* Create and configure test navigation. */

        this._camera = new Camera();

        /* Create and configure label pass. */

        this._labelPass = new LabelRenderPass(context);
        this._labelPass.initialize();
        this._labelPass.camera = this._camera;
        this._labelPass.target = this._defaultFBO;
        this._labelPass.depthMask = true;

        FontFace.fromFile('./data/opensans2048p160d16.fnt', context)
            .then((fontFace) => {
                for (const label of this._labelPass.labels) {
                    label.fontFace = fontFace;
                }
                this._fontFace = fontFace;
                this.updateLabels();

this._uEye = this._program.uniform('u_eye');
        this._uGeometryFlags = this._program.uniform('u_geometryFlags');
        this._uPbrFlags = this._program.uniform('u_pbrFlags');
        this._uBaseColorFactor = this._program.uniform('u_baseColorFactor');
        this._uMetallicFactor = this._program.uniform('u_metallicFactor');
        this._uRoughnessFactor = this._program.uniform('u_roughnessFactor');
        this._uEmissiveFactor = this._program.uniform('u_emissiveFactor');
        this._uNormalScale = this._program.uniform('u_normalScale');

        this._uSpecularEnvironment = this._program.uniform('u_specularEnvironment');
        this._uBRDFLookupTable = this._program.uniform('u_brdfLUT');

        /* Create and configure camera. */

        this._camera = new Camera();
        this._camera.center = vec3.fromValues(0.0, 0.0, 0.0);
        this._camera.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._camera.eye = vec3.fromValues(0.0, 3.0, 1.0);
        this._camera.near = 0.1;
        this._camera.far = 32.0;

        /* Create and configure navigation */

        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;

        /* Create and configure forward pass. */

        this._forwardPass = new ForwardSceneRenderPass(context);
        this._forwardPass.initialize();

protected onInitialize(context: Context, callback: Invalidate,
        /* mouseEventProvider: MouseEventProvider, */
        /* keyEventProvider: KeyEventProvider, */
        /* touchEventProvider: TouchEventProvider */): boolean {

        /* Create framebuffers, textures, and render buffers. */

        this._defaultFBO = new DefaultFramebuffer(this._context, 'DefaultFBO');
        this._defaultFBO.initialize();

        /* Create and configure test navigation. */

        this._camera = new Camera();

        /* Create and configure label pass. */

        this._labelPass = new LabelRenderPass(context);
        this._labelPass.initialize();
        this._labelPass.camera = this._camera;
        this._labelPass.target = this._defaultFBO;
        this._labelPass.depthMask = false;

        FontFace.fromFile('./data/opensans2048p160d16.fnt', context)
            .then((fontFace) => {
                for (const label of this._labelPass.labels) {
                    label.fontFace = fontFace;
                }
                this._fontFace = fontFace;
                this.updateLabels();

this._program = new Program(context, 'ParticleProgram');
        this._program.initialize([vert, frag], false);

        this._program.attribute('a_uv', this._uvLocation);
        this._program.attribute('a_position', this._positionLocation);
        this._program.link();
        this._program.bind();


        this._uView = this._program.uniform('u_view');
        this._uViewProjection = this._program.uniform('u_viewProjection');
        this._uLight = this._program.uniform('u_light');


        this._camera = new Camera();
        this._camera.center = vec3.fromValues(0.0, 0.0, 0.0);
        this._camera.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._camera.eye = vec3.fromValues(0.0, 0.0, 5.0);

        this._camera.near = 0.1;
        this._camera.far = 5.0 + Math.sqrt(32.0); // 1² + 1² -> range in that particles are generated ...

        gl.uniform2f(this._program.uniform('u_nearFar'), this._camera.near, this._camera.far);


        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;


        // prepare draw binding

this._uMeshViewMatrix = this._meshProgram.uniform('u_lightViewMatrix');
        this._uMeshProjectionMatrix = this._meshProgram.uniform('u_lightProjectionMatrix');
        this._uMeshFarPlane = this._meshProgram.uniform('u_lightFarPlane');
        this._uCameraViewProjectionMatrix = this._meshProgram.uniform('u_cameraViewProjectionMatrix');
        this._uMeshDepthTexture = this._meshProgram.uniform('u_depthTexture');

        // Setup Cameras
        this._camera = new Camera();
        this._camera.center = vec3.fromValues(0.0, 0.0, 0.0);
        vec3.normalize(this._camera.up, vec3.fromValues(-1.0, 1.0, 0.0));
        this._camera.eye = vec3.fromValues(6.0, 6.0, 0.0);
        this._camera.near = 3.0;
        this._camera.far = 32.0;

        this._light = new Camera();
        this._light.center = vec3.fromValues(0.0, 0.0, 0.0);
        vec3.normalize(this._light.up, vec3.fromValues(0.0, 1.0, -1.0));
        this._light.eye = vec3.fromValues(0.0, 6.0, 6.0);
        this._light.near = 3.0;
        this._light.far = 16.0;
        this._light.aspect = 1;

        // Setup Navigation
        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;

        // Setup Geometry
        this._cube = new Cube(this._context, 'cube');
        this._cube.initialize(0);

        this._plane = new Plane(this._context, 'plane');

protected onInitialize(context: Context, callback: Invalidate, mouseEventProvider: MouseEventProvider): boolean {
        const gl = this._context.gl;
        const gl2facade = this._context.gl2facade;

        /* Enable required extensions. */

        if (this._extensions === false && this._context.isWebGL1) {
            auxiliaries.assert(this._context.supportsStandardDerivatives,
                `expected OES_standard_derivatives support`);
            /* tslint:disable-next-line:no-unused-expression */
            this._context.standardDerivatives;
            this._extensions = true;
        }

        this._camera = new Camera();
        this._camera.eye = _gEye;
        this._camera.center = _gCenter;
        this._camera.up = _gUp;
        this._camera.near = 0.1;
        this._camera.far = 4.0;

        // Initialize navigation
        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;


        // program
        const vert = new Shader(this._context, gl.VERTEX_SHADER, 'cornell.vert');
        vert.initialize(require('./cornell.vert'));
        const frag = new Shader(this._context, gl.FRAGMENT_SHADER, 'cornell.frag');
        frag.initialize(require(this._context.isWebGL1 ?

protected onInitialize(context: Context, callback: Invalidate, mouseEventProvider: MouseEventProvider,
        /* keyEventProvider: KeyEventProvider, */
        /* touchEventProvider: TouchEventProvider */): boolean {

        /* Create framebuffers, textures, and render buffers. */

        this._defaultFBO = new DefaultFramebuffer(this._context, 'DefaultFBO');
        this._defaultFBO.initialize();

        /* Create and configure test navigation. */

        this._camera = new Camera();
        this._camera.eye = vec3.fromValues(0.0, 0.0, 1.0);
        this._camera.center = vec3.fromValues(0.0, 0.0, 0.0);
        this._camera.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._camera.near = 0.1;
        this._camera.far = 4.0;

        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;

        /* Create and configure label pass. */

        this._labelPass = new LabelRenderPass(context);
        this._labelPass.initialize();
        this._labelPass.camera = this._camera;
        this._labelPass.target = this._defaultFBO;
        this._labelPass.depthMask = false;

this._texture.initialize(1, 1, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE);
        this._texture.wrap(gl.REPEAT, gl.REPEAT);
        this._texture.filter(gl.LINEAR, gl.LINEAR_MIPMAP_LINEAR);
        this._texture.maxAnisotropy(Texture2D.MAX_ANISOTROPY);

        this._texture.fetch('./data/blue_painted_planks_diff_1k_modified.webp', false).then(() => {
            const gl = context.gl;

            this._program.bind();
            gl.uniform1i(this._program.uniform('u_textured'), true);

            this.invalidate(true);
        });


        this._camera = new Camera();
        this._camera.center = vec3.fromValues(0.0, 0.0, 0.0);
        this._camera.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._camera.eye = vec3.fromValues(0.0, 0.0, 5.0);
        this._camera.near = 1.0;
        this._camera.far = 8.0;


        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;

        return true;
    }

this._defaultFBO.bind();

        const gl = context.gl as WebGLRenderingContext;


        this._cuboids = new Array(4);
        for (let i = 0; i < this._cuboids.length; ++i) {
            this._cuboids[i] = new CuboidGeometry(context, 'cube', true, [0.25, 0.5 + 0.5 * i, 2.0]);
            this._cuboids[i].initialize();
        }

        this._plane = new PlaneGeometry(context, 'plane');
        this._plane.initialize();
        this._plane.scale = vec2.fromValues(100, 100);

        this._camera = new Camera();
        this._camera.center = vec3.fromValues(0.0, 0.75, 0.0);
        this._camera.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._camera.eye = vec3.fromValues(1.8, 2.6, 3.4);
        this._camera.near = 2.0;
        this._camera.far = 11.0;


        this._light = new Camera();
        this._light.center = vec3.fromValues(0.0, 0.0, 0.0);
        this._light.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._light.eye = vec3.fromValues(-3.0, 5.0, 4.0);
        this._light.near = 3.0;
        this._light.far = 20.0;


        const vert = new Shader(context, gl.VERTEX_SHADER, 'mesh-shadowed.vert');

this._texture = new Texture2D(context, 'Texture');
        this._texture.initialize(1, 1, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE);
        this._texture.wrap(gl.REPEAT, gl.REPEAT);
        this._texture.filter(gl.LINEAR, gl.LINEAR_MIPMAP_LINEAR);
        this._texture.maxAnisotropy(Texture2D.MAX_ANISOTROPY);

        this._texture.fetch('./data/triangle-texture.webp', false).then(() => {
            const gl = context.gl;

            this._program.bind();
            gl.uniform1i(this._program.uniform('u_textured'), true);

            this.invalidate(true);
        });

        this._camera = new Camera();
        this._camera.center = vec3.fromValues(0.0, 0.0, 0.0);
        this._camera.up = vec3.fromValues(0.0, 1.0, 0.0);
        this._camera.eye = vec3.fromValues(0.0, 0.0, 5.0);
        this._camera.near = 1.0;
        this._camera.far = 8.0;


        this._navigation = new Navigation(callback, mouseEventProvider);
        this._navigation.camera = this._camera;

        return true;
    }