.v1, ...v6,
                // 右 +x
                ...v3, ...v4, ...v5, ...v0,
                // 上 +z
                ...v1, ...v0, ...v5, ...v6,
            ];
            // 乘上box的长度
            var boxVertex = rawVertex.map(function(v) {
                return v * boxLength;
            });
            var positions = new Float64Array(boxVertex);
            // 2 定义法向数组
            var npx = [1, 0, 0];
            var nnx = [-1, 0, 0];
            var npy = [0, 1