The 3D game design is basically a representation of different shapes in three-dimension space using a coordinate system to match their positions. The common coordinate system is the X-axis points on the right and Y-axis points up, and the Z-axis out of the screen.
In 3d game design, there are different types of shapes that are created with vertices (points with own 3D positions in the coordinate system). In every vertex, there are specific attributes such as position, color, normal and texture.
Another important component that comes into play in tutorials for 3d online game design is the rendering pipeline. As emphasized in most guides for beginners, the rendering line is the process of preparing images and output onto the screen. It takes 3D objects designed from primitives by processing, describing vertices, and calculating fragments. Then, they are rendered on 2D screens as pixels.
Other important components of 3D game design include vertex processing, rasterization, fragment processing, and output merging.