Code a User Interface. If you wanted a 3D representation, for example, of a cube, a model program would need the vertexes of the cube to create the 3D view. That is, the model program would need to know the x, y and z coordinates of the eight vertices of the cube.
Design the code of one interface so that a user could type in the x, y and z coordinates of an object. For example, the eight points of the cube. Design a graphical user interface where the user could draw the two-dimensional views of the same object. For the graphical user interface, code the necessary software instructions to retrieve the coordinates of the drawn object and convert those 2D coordinates to three-dimensional coordinates.
Code a 3D graphics engine. The 3D graphics engine converts the given 3D coordinates of an object to 2D coordinates to display on the computer screen. This is just like when a camera takes a picture. The coordinates of the 3D object are captured by the lens and then converted to 2D coordinates on the photo. To make a 3D model program, write code that will make this conversion.
Code a 2D-3D file format conversion software module. Write the code such that it will be able to accept and process different types of graphic files and be able to translate 2D or 3D graphic data. The code should be written such that the graphics engine can process data from these files.
Test the 3D Model Program. Write software to test that the 3D model generator correctly constructs a 3D design from known coordinates of different geometric shapes. Include in the test program a procedure to also test that the 3D object, when rotated, rotates correctly. Test the rotation for all the different geometric shapes that will be processed.