태극기 느낌

* three.js/index5.html
class Stage {
    constructor() {
        this.renderParam = {
            width: window.innerWidth,
            height: window.innerHeight
        };

        this.cameraParam = {
            fov: 20,
            near: 0.1,
            far: 100,
            lookAt: new THREE.Vector3(0, 0, 0),
            x: 0,
            y: 0,
            z: 10
        };

        this.scene = null;
        this.camera = null;
        this.renderer = null;
        this.geometry = null;
        this.material = null;
        this.mesh = null;
        this.isInitialized = false;
    }

    init() {
        this._setScene();
        this._setRender();
        this._setCamera();

        this.isInitialized = true;
    }

    _setScene() {
        this.scene = new THREE.Scene();
    }

    _setRender() {
        this.renderer = new THREE.WebGLRenderer({
            canvas: document.getElementById('webgl-canvas'),
            antialias: true,
            alpha: true
        });
        this.renderer.setPixelRatio(window.devicePixelRatio);
        this.renderer.setClearColor(new THREE.Color(0x161616));
        this.renderer.setSize(this.renderParam.width, this.renderParam.height);
    }

    _setCamera() {
        const windowWidth = window.innerWidth;
        const windowHeight = window.innerHeight;

        if(!this.isInitialized){
            this.camera = new THREE.PerspectiveCamera(
                this.cameraParam.fov,
                this.renderParam.width / this.renderParam.height,
                this.cameraParam.near,
                this.cameraParam.far
            );

            this.camera.position.set(
                this.cameraParam.x,
                this.cameraParam.y,
                this.cameraParam.z
            );
            this.camera.lookAt(this.cameraParam.lookAt);
        }

        this.camera.aspect = windowWidth / windowHeight;
        this.camera.updateProjectionMatrix();
        this.renderer.setPixelRatio(window.devicePixelRatio);
        this.renderer.setSize(windowWidth, windowHeight);
    }

    _render() {
        this.renderer.render(this.scene, this.camera);
    }

    onResize() {
        this._setCamera();
    }

    onRaf() {
        this._render();
    }
}

class Mesh {
    constructor(stage) {
        this.geometryParam = {
            width: 4,
            height: 2.5,
            widthSegments: 20,
            heightSegments: 20
        }
        this.uniforms = {
            u_texture: {
                type: "t",
                value: new THREE.TextureLoader().load("img.jpg")
            },
            u_time: { type: "f", value: 1.0 }
        };

        this.stage = stage;
        this.mesh = null;
    }

    init() {
        this._setMesh();
    }

    _setMesh() {
        const geometry = new THREE.PlaneBufferGeometry(this.geometryParam.width, this.geometryParam.height, this.geometryParam.widthSegments, this.geometryParam.heightSegments);
        const material = new THREE.RawShaderMaterial({
            vertexShader: document.querySelector("#js-vertex-shader").textContent,
            fragmentShader: document.querySelector("#js-fragment-shader").textContent,
            uniforms: this.uniforms
        });

        this.mesh = new THREE.Mesh(geometry, material);
        this.stage.scene.add(this.mesh);
    }

    _render() {
        this.uniforms.u_time.value += 0.02;
    }

    onRaf() {
        this._render();
    }
}

(() => {
    const stage = new Stage();
    const mesh = new Mesh(stage);

    stage.init();
    mesh.init();

    window.addEventListener("resize", () => {
        stage.onResize();
    });

    const _raf = () => {
        window.requestAnimationFrame(() => {
            stage.onRaf();
            mesh.onRaf();

            _raf();
        });
    };

    _raf();
})();