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<!DOCTYPE html>
< html lang = "zh" >
< head >
< meta charset = "utf-8" / >
< base href = "../../../" / >
< script src = "page.js" > < / script >
< link type = "text/css" rel = "stylesheet" href = "page.css" / >
< / head >
< body >
[page:Object3D] → [page:Line] →
< h1 > 环线（[name]） < / h1 >
< p class = "desc" >
一条头尾相接的连续的线。< br / > < br / >
它几乎和[page:Line]是相同的，唯一的区别是它在渲染时使用的是[link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/drawElements gl.LINE_LOOP]，
而不是[link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/drawElements gl.LINE_STRIP]，
它绘制一条直线到下一个顶点，并将最后一个顶点连回第一个顶点。
< / p >
< h2 > 构造器< / h2 >
< h3 > [name]( [param:BufferGeometry geometry], [param:Material material] )< / h3 >
< p >
[page:BufferGeometry geometry] —— 表示环线上的点的顶点列表。< br / >
[page:Material material] —— 线的材质，默认值是[page:LineBasicMaterial LineBasicMaterial]。
< / p >
< h2 > 属性< / h2 >
< p > 共有属性请参见其基类[page:Line]。< / p >
< h3 > [property:Boolean isLineLoop]< / h3 >
< p >
只读属性，用于检查给定对象是否为[name]类型。
< / p >
< h2 > 方法< / h2 >
< p >
共有方法请参见其基类[page:Line]。< / p >
< h2 > 源代码< / h2 >
< p >
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
< / p >
< / body >
< / html >