Add sandpack

lib/md/how-to-load-a-background-with-threejs.md

@@ -1,48 +0,0 @@
-Image a camera inside a cube box. The cube box is our scene. just like `const scene = new THREE.Scene();`. The camera is our perspect camera.
-
-```ts
-new THREE.PerspectiveCamera();
-```
-
-Now, we can see the inside of the cube box. The inside texture of the box is our sky. Our camera can see all six texture surround ours give ours the illusion the we are within a larger environment.
-
-## Three.js setup
-
-First, we need a little bit of setup. Let's create a sence and a camera.
-
-```ts
-const scene = new THREE.Scene();
-
-const camera = new THREE.PerspectiveCamera(
-  75,
-  window.innerWidth / window.innerHeight,
-  0.1,
-  1000
-);
-```
-
-The default camera position is in the center at `(0, 0, 0)`.
-
-And now, We need render scene into our document. So we need a WebGL renderer.
-
-```ts
-const renderer = new THREE.WebGLRenderer({
-  canvas: document.querySelector('#canvas')
-  antialias: true,
-});
-```
-
-With a little bit of setup:
-
-```ts
-renderer.setPixelRatio(window.devicePixelRatio);
-renderer.setSize(window.innerWidth, window.innerHeight);
-```
-
-Render to screen :
-
-```ts
-renderer.render(scene, camera);
-```
-
-Now, we can get a black canvas in our document.