可以通过faces与vertices结合Triangle运算获取立方体各个面的面积
示例代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/three.js"></script>
<script type="text/javascript">
var geom = new THREE.PlaneGeometry(100, 100);
var face0 = geom.faces[0]; // you know what face, you want to get its area
var verts = geom.vertices;
var tri = new THREE.Triangle(verts[face0.a], verts[face0.b], verts[face0.c]);
var area = tri.getArea()*2;
alert(area+"平米");
</script>
</head>
<body>
</body>
</html>
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