Three-dimensional graphic rendering is relatively difficult. The first is to determine a good perspective relationship, you can use lines to pull out a simple perspective line, different graphics need different lines. Then on the perspective line to draw a reasonable drawing of the physical drawings. Later color, rendering texture can be.
Final effect
1, first dozen good grid line, bright spot perspective. I recommend finding a square object first to refer to and to determine the angle. Remember that the smaller the face you see, the closer they are to the radiation point. Draw the angle you want and then connect the vertical bar.
2, then the vertical bar diagonal connection, and intersection points connected together. If the line you are connecting to is straight, then your perspective is fine.
3, the other first connected together, a square is completed.
4, draw out two rounded corners, the circle is derived from the square, then you can simply use PS do such things, the following figure.
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