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Goal:

Implementing the optimal method for drawing a 3D model by minimizing the designing stages.

Realization:

The first important requirement is to place the 3D model in such a position that its Isometric view coincides with the view of the image from the corresponding example. This makes sure that the other views (front, top, right, etc.) are placed correctly. The principles of sketch creation were analyzed in the chapter “Sketch analysis”.
Hence, the first sketch must contain as much information as possible about the geometrical form of the 3D model (further descriptions will be assigned to each example).
In the end, the optimal design methods should be chosen by taking into consideration the functions of symmetry, fillet, chamfer, pattern, etc.