| 摘要 |
PURPOSE:To shorten a smooth shading processing time by dividing a smooth shading subject graphic into plural triangles. CONSTITUTION:For instance, a partial triangle P1AB of a triangle P1P2P3 undergoes the smooth shading via scanning. Thus the smooth shading is possible for all points of other triangles AP2C, BCP3 and CBA by performing the arithmetic processes via subtractors 4 and 5 and an adder 6. Therefore a scanning process is given to the triangle P1AB only and the smooth shading processing time is shortened. The processing time is also shortened even with another type of pattern by dividing the graphic into triangles and applying the smooth shading process in the same way.
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