| Summary: | 碩士 === 明道大學 === 資訊傳播學系碩士班 === 101 === Polygon graphic rendering technology has been widely used in 3D stereoscopic display, dynamic simulation, material structure and realistic graphics, and so on. It has already occupied an important place in computer graphics. It is worthy of study.
Polygon graphic rendering is usually performed for all the scan lines on the screen, identifying each online pixel inside the polygon, then coloring. Due to the extremely large number of pixels on the screen, point-by-point identification is time consuming.
The polygon graphic rendering mentioned in this article is also performed for all the scan lines on the screen. A scan line may be divided into several subsegments by clipping with the polygon’s edges. Using string pattern recognition method to identify subsegments inside the polygon, then coloring all pixels on the subsegments to complete the coloring work.
The graph coloring of the polygon covers two fields: the graphic clipping and the surface rendering.
By introducing the string pattern recognition algorithm, even concave polygons can easily be applied in the field of graphic clipping, not limited to convex polygons.
In polygon surface coloring, a large number of operations (to gain intersection point coordinates of two straight lines) is needed. By means of the new midpoint partition algorithm and the position identification algorithm, the operations of intersection points will be simplified.
In summary, the introducing of string pattern recognition algorithms, has help raise the identification level from "point" to "line" and make both convex and concave polygons are easily to be clipped in the field of graphic clipping. Improved midpoint partition algorithm has also simplified operations in calculating intersection point coordinates of two straight lines.
The article has offered some contributions to polygon graphic rendering technology.
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