Rendering Threejs in React dissapears my root element in HTML - reactjs

Question

I'm trying to use Three.js in Typescript react, I render Dodecahedron figure and random stars, I want to add some mark up to my three.js with React but when I render Three.js canvas into HTML it dissapears my root div, and I'm not able to add some other components
THREE.JS
import * as THREE from "three";
export function ThreeCanvas() {
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.innerHTML = "";
document.body.appendChild(renderer.domElement);
const geometry = new THREE.DodecahedronBufferGeometry(1.7, 0);
const material = new THREE.MeshStandardMaterial({
color: "#00FF95",
});
const Stars = () => {
const starGeometry = new THREE.SphereGeometry(0.1, 24, 24)
const starMaterial = new THREE.MeshStandardMaterial({color: 0xffffff})
const star = new THREE.Mesh(starGeometry, starMaterial)
const [x, y, z] = Array(3).fill(1).map(() => THREE.MathUtils.randFloatSpread(70))
star.position.set(x, y, z)
scene.add(star)
}
Array(200).fill(100).forEach(Stars)
const light = new THREE.PointLight(0xffffff)
light.position.set(20, 20, 20)
scene.add(light)
camera.position.z = 5;
camera.position.x = 3.5
const Figure = new THREE.Mesh(geometry, material);
scene.add(Figure);
const animate = () => {
requestAnimationFrame(animate);
Figure.rotation.x += 0.01;
Figure.rotation.y += 0.01;
renderer.render(scene, camera);
};
animate();
window.addEventListener("resize", () => {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
});
return null
}
this is my three.js code what I do in react
React
import ReactDOM from "react-dom"
import { ThreeCanvas } from "./Components/Three";
import Landing from "./Components/Landing";
import "./Style/Style.css"
const FirstSection = () => {
return (
<div className="container">
<Landing />
<ThreeCanvas />;
</div>
);
}
ReactDOM.render(<FirstSection />, document.getElementById("root"));
Landing is my markup component when I open console I dont see anywhere my Landing element but in react tools I see, how to fix that issue I have no idea

Answer 1

You're removing document.body in Three.JS component which is why the body only contains the canvas. You might want to use a reference to the element instead of targeting document.body so that it's not disturbing the DOM structure which is why your markdown does not show. As a rule of thumb, you should never be interacting with the DOM via the document.
document.body.innerHTML = "";
I've quickly refactored the Three.JS component to use a React element reference so that you can add additional markup.
Refactored ThreeCanvas Component
import * as React from "react";
import * as THREE from "three";
export function ThreeCanvas() {
const ref = React.useRef();
const [loaded, setLoaded] = React.useState(false);
React.useEffect(() => {
if (!loaded && ref) {
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(
75,
window.innerWidth / window.innerHeight,
0.1,
1000
);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
const geometry = new THREE.DodecahedronBufferGeometry(1.7, 0);
const material = new THREE.MeshStandardMaterial({
color: "#00FF95"
});
const Stars = () => {
const starGeometry = new THREE.SphereGeometry(0.1, 24, 24);
const starMaterial = new THREE.MeshStandardMaterial({
color: 0xffffff
});
const star = new THREE.Mesh(starGeometry, starMaterial);
const [x, y, z] = Array(3)
.fill(1)
.map(() => THREE.MathUtils.randFloatSpread(70));
star.position.set(x, y, z);
scene.add(star);
};
Array(200).fill(100).forEach(Stars);
const light = new THREE.PointLight(0xffffff);
light.position.set(20, 20, 20);
scene.add(light);
camera.position.z = 5;
camera.position.x = 3.5;
const Figure = new THREE.Mesh(geometry, material);
scene.add(Figure);
const animate = () => {
requestAnimationFrame(animate);
Figure.rotation.x += 0.01;
Figure.rotation.y += 0.01;
renderer.render(scene, camera);
};
const resize = () => {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
};
animate();
ref.current.appendChild(renderer.domElement);
window.addEventListener("resize", resize);
setLoaded(true);
return () => window.removeEventListener("resize", resize);
}
}, [ref, loaded]);
return <div ref={ref} />;
}
export default ThreeCanvas;
Typescript Version: ThreeCanvas.tsx
import * as React from "react";
import * as THREE from "three";
export function ThreeCanvas() {
const ref = React.useRef<HTMLDivElement>(null);
const [loaded, setLoaded] = React.useState(false);
React.useEffect(() => {
if (!loaded && ref.current) {
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(
75,
window.innerWidth / window.innerHeight,
0.1,
1000
);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
const geometry = new THREE.DodecahedronBufferGeometry(1.7, 0);
const material = new THREE.MeshStandardMaterial({
color: "#00FF95"
});
const Stars = () => {
const starGeometry = new THREE.SphereGeometry(0.1, 24, 24);
const starMaterial = new THREE.MeshStandardMaterial({
color: 0xffffff
});
const star = new THREE.Mesh(starGeometry, starMaterial);
const [x, y, z] = Array(3)
.fill(1)
.map(() => THREE.MathUtils.randFloatSpread(70));
star.position.set(x, y, z);
scene.add(star);
};
Array(200).fill(100).forEach(Stars);
const light = new THREE.PointLight(0xffffff);
light.position.set(20, 20, 20);
scene.add(light);
camera.position.z = 5;
camera.position.x = 3.5;
const Figure = new THREE.Mesh(geometry, material);
scene.add(Figure);
const animate = () => {
requestAnimationFrame(animate);
Figure.rotation.x += 0.01;
Figure.rotation.y += 0.01;
renderer.render(scene, camera);
};
const resize = () => {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
};
animate();
ref.current.appendChild(renderer.domElement);
window.addEventListener("resize", resize);
setLoaded(true);
return () => window.removeEventListener("resize", resize);
}
}, [ref, loaded]);
return <div ref={ref} />;
}
export default ThreeCanvas;