Three.js:如何更新BufferGeometry顶点

Question

我只需要更新一个有2个顶点的线,并且我试图使用上面这些在r58中更改的东西,但线条不能移动,我只是将其初始化:

var geometry = new THREE.BufferGeometry();
geometry.addAttribute('position', Float32Array, 2, 3);
geometry.dynamic = true;

var position = geometry.attributes.position;
position.needsUpdate = true;

var p = position.array;

var i = 0;
p[i++] = vertex1.position.x;
p[i++] = vertex1.position.y;
p[i++] = vertex1.position.z;
p[i++] = vertex2.position.x;
p[i++] = vertex2.position.y;
p[i] = vertex2.position.z;

var color = new THREE.Color();
color.g = color.b = 1 - this.value;

var material = new THREE.LineBasicMaterial({
  color: color.getHex(),
  linewidth: 5 // THIS DON'T WORKS IN WINDOWS?
});

this.model = new THREE.Line(geometry, material);

并在更新渲染中我只是这样做:

var p = this.model.geometry.attributes.position.array;

var i = 0;
p[i++] = vertex1.position.x;
p[i++] = vertex1.position.y;
p[i++] = vertex1.position.z;
p[i++] = vertex2.position.x;
p[i++] = vertex2.position.y;
p[i] = vertex2.position.z;

但线条没有移动或渲染自己.

Answer 1

在您的情况下,您需要在更新顶点时在渲染循环中添加以下内容:

this.model.geometry.attributes.position.needsUpdate = true;

您可以position.needsUpdate = true在创建几何图形时删除线条.

我还建议您更新到当前版本.

three.js r.63