写一个threejs 两点之间线条生长得动画js代码
时间: 2023-06-05 14:06:48 浏览: 259
当然,我很乐意为您解答。以下是您请求的three.js代码示例,用于创建动态生长线段的动画:
```javascript
// 在HTML中创建一个名为“canvas”的画布:
<canvas id="canvas"></canvas>
// 在JavaScript中定义一些全局变量:
var renderer, scene, camera;
var line, startPoint, endPoint;
var t = 0;
//初始化three.js场景:
function init() {
// 创建渲染器,设置画布尺寸并添加到HTML文档中:
renderer = new THREE.WebGLRenderer({canvas: document.getElementById('canvas')});
renderer.setSize(window.innerWidth, window.innerHeight);
// 创建一个新场景:
scene = new THREE.Scene();
// 创建并添加透视相机:
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.set(0, 0, 5);
// 创建一个新材质对象:
var material = new THREE.LineBasicMaterial({color: 0xffffff});
// 确定起点和终点:
startPoint = new THREE.Vector3(-1, 0, 0);
endPoint = new THREE.Vector3(1, 0, 0);
// 创建一个新线条对象:
var geometry = new THREE.Geometry();
geometry.vertices.push(startPoint);
geometry.vertices.push(startPoint);
line = new THREE.Line(geometry, material);
// 将线条添加到场景中:
scene.add(line);
}
// 更新线条:
function updateLine() {
// 计算线条当前位置:
var position = new THREE.Vector3();
position.copy(endPoint);
position.sub(startPoint);
position.multiplyScalar(t);
position.add(startPoint);
// 更新线条的终点:
line.geometry.vertices[1] = position;
line.geometry.verticesNeedUpdate = true;
// 步进时间t:
t += 0.01;
if (t > 1) t = 0;
}
// 渲染场景:
function render() {
requestAnimationFrame(render);
updateLine();
renderer.render(scene, camera);
}
// 初始化、渲染场景:
init();
render();
```
希望这个代码示例对您有所帮助。如果您还有其他问题,欢迎继续向我提问!