三个js顶点不更新
三个js顶点不更新
提问于 2014-07-02 20:30:16
我使用的是three.js r67，顶点似乎没有更新。我设置了geometry.dynamic = true，geometry.verticesNeedUpdate = true。圆在移动，但线是静止的.
有人能帮我吗？
var scene = new THREE.Scene();
var renderer = new THREE.WebGLRenderer();
var g = new THREE.CircleGeometry( 4, 16 );
var m = new THREE.MeshBasicMaterial({color: 0x114949});
var circle = new THREE.Mesh( g, m );
circle.position.x = 2;
circle.position.y = 2;
circle.position.z = -1;
scene.add( circle );
var material = new THREE.LineBasicMaterial({color: 0xDF4949, linewidth: 5});
var geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(0, 0, 0));
geometry.vertices.push(new THREE.Vector3(1, 1, 0));
geometry.verticesNeedUpdate = true;
geometry.dynamic = true;
var line = new THREE.Line(geometry, material);
scene.add(line);
var update = function() {
circle.position.x += 0.01;
line.geometry.vertices[0].x = circle.position.x;
};
var render = function() {
renderer.render(scene, camera);
};
var loop = function() {
update();
render();
requestAnimationFrame(loop, renderer.canvas);
};
loop();回答 1
Stack Overflow用户
回答已采纳
发布于 2014-07-03 00:35:05
如果要更改几何体的顶点，则需要设置geometry.verticesNeedUpdate = true;。
function update() {
circle.position.x += 0.01;
line.geometry.vertices[ 0 ].x = circle.position.x;
line.geometry.verticesNeedUpdate = true;
};渲染后，geometry.verticesNeedUpdate将重置为false，因此每次更改几何体顶点时，都需要将其重置为true。
编辑:如果您使用的是BufferGeometry，请改用以下模式：
geometry.attributes.position.needsUpdate = true;three.js r.74
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原文链接：
https://stackoverflow.com/questions/24531109
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