ScrollTrigger

* three.js/index3.html
class Stage {
    constructor() {
        this.renderParam = {
            width: window.innerWidth,
            height: window.innerHeight
        };

        this.cameraParam = {
            fov: 75,
            near: 0.001,
            far: 5000,
            lookAt: new THREE.Vector3(0, 0, 0),
            x: 1,
            y: 1,
            z: 40
        };

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

    init() {
        this._setMesh();
        this.onScroll();
    }

    _setMesh() {
        const geometry = new THREE.IcosahedronGeometry(20, 1)
        const material = new THREE.MeshNormalMaterial({
            wireframe: true
        });

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

    onScroll() {
        gsap.registerPlugin(ScrollTrigger)
        ScrollTrigger.defaults({
            scrub: 3,
            ease: 'none',
        })

        const sections = document.querySelectorAll('.section')
        gsap.from(this.mesh.position, {
            x: 1,
            duration: 1,
            ease: 'expo',
        })
        
        gsap.to(this.mesh.rotation, {
            x: Math.PI * 2,
            scrollTrigger: {
                trigger: sections[1],
            },
        })
        gsap.to(this.mesh.scale, {
            x: 0.5,
            scrollTrigger: {
                trigger: sections[2],
            },
        })
        gsap.to(this.mesh.rotation, {
            y: Math.PI * 2,
            scrollTrigger: {
                trigger: sections[3],
            },
        })
        gsap.to(this.mesh.scale, {
            y: 0.5,
            scrollTrigger: {
                trigger: sections[4],
            },
        })
        gsap.to(this.mesh.rotation, {
            x: Math.PI * 2,
            scrollTrigger: {
                trigger: sections[4],
            },
        })
        
    }

    onMouseMove(e) {
        const x = e.clientX;
        const y = e.clientY;

        gsap.to(this.stage.scene.rotation, {
            y: gsap.utils.mapRange(0, window.innerWidth, 1, -1, x),
            x: gsap.utils.mapRange(0, window.innerHeight, 1, -1, y),
        })
    }

    _render() {}

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

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

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

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

    window.addEventListener("mousemove", (e) => {
        mesh.onMouseMove(e);
    })

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

    _raf();
})();