A Study on Drawing the Shadow of a Curve Revolving Object under Commonly Used Ray |
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| Authors: | YU Xi-fa YI Su-jun SUN Huai-lin |
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| Affiliation: | YU Xi-fa1,YI Su-jun2,SUN Huai-lin1 (1. College of Civil Science , Engineering,Yangzhou University,Yangzhou 225009,2. Mathematics , Information College,East China Institute University,Fuzhou 344000,China) |
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| Abstract: | The shadow of a circle casting on a unparallel plane is an ellipse, the shadow algorithm involves a perspective affine transformation. Under commonly used light, the transformation matrix for parallel circles of different diameters casting shadows onto the same plane is identical. Using AutoCAD to get the shadow of a general object of revolution, it only needs to take a series of circles along the axis of symmetry and get their corresponding shadows of ellipses, drawing an envelope to cover all these silhou... |
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| Keywords: | engineering graphics shadow algorithm curve object of revolving ellipse envelope |
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