Draw Prism in js

/**
This code draws a 1 x 1 x 2 red straight prism.
**/

var canvas = document.createElement('canvas');
document.body.appendChild(canvas);

var renderer = new THREE.WebGLRenderer({ canvas: canvas });

var scene = new THREE.Scene();

var prism = new THREE.Mesh(
  new THREE.CylinderGeometry(1, 1, 2, 6),
  new THREE.MeshBasicMaterial({ color: 0xff0000 })
);
scene.add(prism);

var camera = new THREE.PerspectiveCamera(75, 1, 0.1, 1000);
camera.position.z = 5;

renderer.render(scene, camera);