Our application is a join point model APP. It has three big functions. The first feature, which is very flexible, can draw closed-circuit graphics on the screen, and then click 3D, you can generate a 3D model, you can view at any angle. The second function, you can open the connection point, and the density of the connection point size, you can drag the progress bar change. You can draw your graphics on this. Compared with the first function, its function is to make you draw the standard graphics better. Again, you need to click 3D to generate. The third function, the 3D button, is used in the first and second functions. And you can choose the section settings on the top right side of the screen. Note: When using the application program, the user must ensure that a complete graphics, graphics can not exist any lines and patterns, must ensure that the graphics inside is empty.