Introduction - If you have any usage issues, please Google them yourself
		 
The program function
                1. Loading the 3D model by an pop window (only .m file) 
                2. Displaying the model
                    2.1 grond
                        Ground (xy-plane):press  p  to toggle the display modes
                        coordinate axes:press  a  to toggle the display modes
                        bounding box:press  b  to toggle the display modes
                    2.2 The model have 4 colors, it change colors by select different display mode
                    2.3 two projection mode: press   j  to Cycle through display mode
                    orthogonal projection
                    perspective projection
                    2.4 Changing the display mode :press  o  to Cycle through display mode
                        Points 
                        Wireframe rendering 
                        Flat shading 
                        Smooth shading 
                3. Camera control