SOURCE

const content = buildContentModels()
renderModel(content)

function make2dPointsAndLines() {
    // 二维点数据
    const points = [
        [1, 1],
        [2, 10],
        [10, 10],
    ]
    // 线数据，值为点数据的下标
    const lines = [
        [0, 1],
        [2, 1],
    ]

    return { points, lines }
}

function buildContentModels() {
    const group = new THREE.Group()
    // 二维点数据与线数据
    const { points, lines } = make2dPointsAndLines()

    // 画点
    // 转换为三维点数据
    const vertices = points.reduce((result, [x, y]) => {
        result.push(x, 0, y)
        return result
    }, [])
    const geometry = new THREE.BufferGeometry();
    geometry.setAttribute('position', new THREE.Float32BufferAttribute(vertices, 3));
    const material = new THREE.PointsMaterial({ color: 0xff0000, size: 3 });
    group.add(new THREE.Points(geometry, material));

    // 画线
    const lineMaterial = new THREE.LineBasicMaterial({ color: 0xff0000 });
    lines.forEach(line => {
        // 转换为三维线数据
        const point0 = vertices.slice(line[0] * 3, line[0] * 3 + 3)
        const point1 = vertices.slice(line[1] * 3, line[1] * 3 + 3)
        const lineVertices = point0.concat(point1)
        lineGeometry = new THREE.BufferGeometry();
        lineGeometry.setAttribute('position', new THREE.Float32BufferAttribute(lineVertices, 3));
        group.add(new THREE.Line(lineGeometry, lineMaterial));
    })

    return group
}

function renderModel(model) {
    const scene = new THREE.Scene();

    // 渲染器
    const renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement);
    scene.add(new THREE.GridHelper(100, 10, 0x00dddd, 0xffffff))

    // 相机
    const camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight,
        0.1, 1000);
    camera.position.set(0, 100, 75);
    camera.lookAt(0, 0, 13)

    // 环境光
    const ambient = new THREE.AmbientLight(0xffffff, 0.6)
    scene.add(ambient)

    // 内容
    scene.add(model)

    // 动画
    const animate = function () {
        requestAnimationFrame(animate);
        renderer.render(scene, camera);
    };
    animate();
}

<div>test</div>

body { margin: 0; }
canvas { width: 100%; height: 100% }