Chapter 2 - WebGL Up and Running book の例を実行しています。
静的なテクスチャ マッピングされた立方体を表示したいと考えています。
このコードは機能しません:
var camera = null,
renderer = null,
scene = null,
cube = null,
animating = false;
function onLoad() {
// Grab our container div
var container = document.getElementById("container");
// Create the Three.js renderer, add it to our div
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(container.offsetWidth, container.offsetHeight);
container.appendChild(renderer.domElement);
// Create a new Three.js scene
scene = new THREE.Scene();
// Put in a camera
camera = new THREE.PerspectiveCamera(45,
container.offsetWidth / container.offsetHeight, 1, 4000);
camera.position.set(0, 0, 3);
// Create a directional light to show off the object
var light = new THREE.DirectionalLight(0xffffff, 1.5);
light.position.set(0, 0, 1);
scene.add(light);
// Create a shaded, texture-mapped cube and add it to the scene
// First, create the texture map
var mapUrl = "cuttherope.jpg";
var map = THREE.ImageUtils.loadTexture(mapUrl);
// Now, create a Phong material to show shading; pass in the map
var material = new THREE.MeshPhongMaterial({
map: map
});
// Create the cube geometry
var geometry = new THREE.CubeGeometry(1, 1, 1);
// And put the geometry and material together into a mesh
cube = new THREE.Mesh(geometry, material);
// Turn it toward the scene, or we won't see the cube shape!
cube.rotation.x = Math.PI / 5;
cube.rotation.y = Math.PI / 5;
// Add the cube to our scene
scene.add(cube);
renderer.render(scene, camera);
}
しかし、run関数を追加して requestAnimationFrame を呼び出すと、キューブが表示されます
...
cube.rotation.x = Math.PI / 5;
cube.rotation.y = Math.PI / 5;
// Add the cube to our scene
scene.add(cube);
run();
}
function run() {
renderer.render(scene, camera);
requestAnimationFrame(run);
}
誰かが私に理由を説明してもらえますか? ありがとう！