threejs 繪制輔助網格

GridHelper.js可以幫助繪制一個xz平面網格，它沒有提供更多的參數，所以不能用於生成xy網格。

xy網格實現代碼如下：

 

        var size = 6000;
        var divisions = 50;

        // var gridHelper = new THREE.GridHelper(size, divisions, 0x1231c3, 0x135133);
        // this.scene.add(gridHelper);

        var geometry = new THREE.Geometry(); //創建geometry  
        geometry.vertices.push(new THREE.Vector3(-size / 2, 0, 0)); //添加頂點  
        geometry.vertices.push(new THREE.Vector3(size / 2, 0, 0));
        for (var i = 0, len = size / divisions; i <= len; i++) {
            var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({
                color: 0x455454
            })); //利用geometry和material創建line  
            line.position.y = i * divisions - size / 2; //設置line的位置  
            this.scene.add(line); //將line添加到場景中  

            var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({
                color: 0x324132
            }));
            line.position.x = i * divisions - size / 2;
            line.rotation.z = Math.PI / 2; //繞y軸旋轉90度  
            this.scene.add(line);
        }