称，默认为aPosition
                    positionAttribute: 'aPosition',
                    normalAttribute: 'aNormal',
                    //顶点个数，默认为3
                    positionSize : 3
                }
            );
            const material = new reshader.PhongMaterial();
            const modelMesh = new reshader.Mesh(plane, material);
            modelMesh.setUniform('uPickingId', 4);
            const transformat = mat4.identity([]);
            mat4.scale(transformat, transf