| 摘要 |
The invention consists of a focused light beam source mounted on a straight-edge, which is aligned to an off-drawing vanishing point target reference, to sketch object lines in a manner which creates depth perspective and thus maintains the three-dimensional visual character of the object to be drawn. The desired line of the object is drawn after locating and marking the reference vanishing point which will maintain that object line in visual perspective with related object lines. The straight-edge is aligned by targeting a focused light beam at the vanishing point, and the object line is drawn along the straight-edge while the light beam is striking the target marking the vanishing point. The preferred embodiment of the invention is configured with one light source, and uses reflecting mirrors which direct the light beam along the straight edge. The invention can alternately be configured with more than one light beam source, either with or without reflectors, to accomplish the same alignment function.
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