您好，我正在尝试遵循有关three.js的教程，并且在使用预定义的canvas元素进行渲染时遇到了麻烦。如果我让three.js创建渲染器DOM元素，则一切正常。但是，使用getElementById获取画布并将其发送到WebGLRenderer构造函数使其仅输出；
THREE.WebGLRenderer：不支持WEBGL_draw_buffers扩展。
这里是工作代码1;
<!DOCTYPE: html>
<html>
<head>
<script src="https://threejs.org/build/three.js"></script>
</head>
<body>
<script>
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial({
color: 0x00ff00
});
var cube = new THREE.Mesh(geometry, material);
scene.add(cube);
camera.position.z = 5;
var animate = function() {
requestAnimationFrame(animate);
cube.rotation.x += 0.01;
cube.rotation.y += 0.01;
renderer.render(scene, camera);
};
animate();
</script>
</body>
</html>和工作代码2;
<!DOCTYPE: html>
<html>
<head>
<script src="https://threejs.org/build/three.js"></script>
</head>
<body>
<canvas id="render_canv_1"></canvas>
<script>
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
var renderer = new THREE.WebGLRenderer({
canvas : render_canv_1
});
renderer.setSize(window.innerWidth, window.innerHeight);
var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial({
color: 0x00ff00
});
var cube = new THREE.Mesh(geometry, material);
scene.add(cube);
camera.position.z = 5;
var animate = function() {
requestAnimationFrame(animate);
cube.rotation.x += 0.01;
cube.rotation.y += 0.01;
renderer.render(scene, camera);
};
animate();
</script>
</body>
</html>还有我的天真什么时候都不会渲染任何东西;
<!DOCTYPE: html>
<html>
<head>
<script src="https://threejs.org/build/three.js"></script>
</head>
<body>
<canvas id="render_canv_1"></canvas>
<script>
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
// THIS IS WHERE I STUCK...
// get canvas object
const canv = document.querySelector('render_canv_1')
var renderer = new THREE.WebGLRenderer({
canv
});
renderer.setSize(window.innerWidth, window.innerHeight);
//
var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial({
color: 0x00ff00
});
var cube = new THREE.Mesh(geometry, material);
scene.add(cube);
camera.position.z = 5;
var animate = function() {
requestAnimationFrame(animate);
cube.rotation.x += 0.01;
cube.rotation.y += 0.01;
renderer.render(scene, camera);
};
animate();
</script>
</body>
</html>我对JS很陌生，如果有人可以通过错误引导我，我将非常高兴。
您的第三个示例具有：
var renderer = new THREE.WebGLRenderer( { canv } );
应该是：
var renderer = new THREE.WebGLRenderer( { canvas: canv } );
您可以通过查看WebGLRenderer class的来源来查看正在发生的情况。