您好，我正在尝试遵循有关 Three.js 的教程，但在使用预定义的 Canvas 元素作为渲染器时遇到问题。如果我让 Three.js 创建渲染器 DOM 元素，一切都会正常。但是使用 getElementById 获取 Canvas 并将其发送到 WebGLRenderer 构造函数使其仅输出；
THREE.WebGLRenderer: WEBGL_draw_buffers extension not supported.
这是工作代码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>我天真的尝试没有渲染任何东西；
<!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，如果有人能指导我解决问题，我会非常高兴。
最佳答案
您的第三个示例有:
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的来源来了解发生了什么。 。
编辑:
我也刚刚注意到你的选择器是错误的。
const canv = document.querySelector('render_canv_1')不会工作。
尝试使用const canv = document.getElementById('render_canv_1');
关于javascript - 使用预定义的 Canvas 作为渲染器会导致麻烦，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60012189/