We also find some evidence that the quality of these line definitions depends on the geometric context of the line. We find that line drawings can yield percepts almost as accurate as shaded images, but that no line definition is universally superior to others. In the first study, we compare the accuracy of 3D shape percepts from line definitions, artist drawings, and shaded images. In order to improve these methods, we use perceptual studies to understand when these methods are effective and when they are not. However, the resulting drawings are inconsistent in quality. Attempts to have computers automatically generate line drawings vary based on the ``definitions'' used to determine line placement.
They can abstract away other features like shading, texture, color, and others while still yielding a vivid sense of shape. Description Line drawings offer a way to depict 3D shape using a ``minimal'' representation.
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