   },
            triangles,
            0,
            {
                primitive,
                //顶点的属性名称，默认为aPosition
                positionAttribute: 'POSITION',
                //顶点个数，默认为3
                positionSize : 3
            });
        }

        function getViewProjection() {
            const aspect = canvas.width / canvas.height;
            const projMatrix = mat4.perspective([], 60 * Math.PI / 180, aspect, cameraNearFar[0], cameraNearFar[1]);
  