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Phong-shaded 3D imagery does not provide geometric information of the same richness as human-drawn technical illustrations. A non-photorealistic lighting model is presented that attempts to nar- row this gap. The model is based on practice in traditional tech- nical illustration, where the lighting model uses both luminance and changes in hue to indicate surface orientation, reserving ex- treme lights and darks for edge lines and highlights. The light- ing model allows shading to occur only in mid-tones so that edge lines and highlights remain visually prominent. In addition, we show how this lighting model is modified when portraying models of metal objects. These illustration methods give a clearer picture of shape, structure, and material composition than traditional com- puter graphics methods.

A non-photorealistic lighting model for automatic technical illustration