Shading pictorial drawings can be very effective in describing the shapes of objects in display drawings, patent drawings, and other pictorial drawing. Ordinary working drawings are not shaded.

Since the purpose of an industrial pictorial drawing is to show clearly the shape, the shading should be simple, should reproduce well, and should be limited to producing a clear picture. Some of the common types of shading are shown. Pencil or ink lines are drawn mechanically or freehand. Two methods of shading fillets and rounds are shown sketches c and d. Shading produced with pen dots is shown in sketch e, and pencil "tone" shading shown in sketch f. It gives poor results though using xerography (a dry photocopying technique) copying.

No matter what type of render you aim for in the end, the principles behind good shading are the same. 

1. Create the image to be rendered. 

2. Determine the light source. 

3. Knowing the light source determine the path of the shade the object casts and the outline of the shadow. 

4. Use a monotone shade when rendering the shadow or any flat area in complete shade.  

5. Sections of the sketch that are more in line of site of the light source are shaded in lighter.  

6. Curving surfaces use a render that gradually darkens the further you go into the area of shade.

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