![]() Shading a cylinder gives it depth and shape that may have otherwise been lost if presented flat or as a side view rectangle. Couple this with the fact that often the idea that is selected for further development is not the best idea, but instead is the idea that is most clearly understood by the decision makers. These decisions are often driven by simple sketches made on paper, post-its, white boards, etc. Many critically important design decisions are made very early in the conceptual development of a product, way before CAD is involved. Though there are only three tones, there are generally 6 shaded regions, as shown below.Ĭlearly computer software such as solid CAD modeling can be used to produce great shadows and reflections for any part, so why is it valuable to hand shadow and shade objects? The reason is simple. On the other hand, the light that hits the cylinder tangentially (green line) would not reflect back to us, so it would appear dark.īecause we are not often standing at the light source, those reflections are shifted just a little, counter clock wise.Īs shown below, there are generally three tones in the shading a light tone where the reflection is greatest (shifted slightly from the near normal line), dark tone where the reflection is least (shifted slightly from the near tangent line), and mid tones in between, where light and dark are blended. To make sense of the reflection, know that if we were standing at the light source, then most of the light that hits the cylinder normal to its surface (blue line), will reflect back to us and appear bright. Notice how the light rays reflect differently off the object depending on where it hits the surface (see blue and green lines and where they hit they object).
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