Shading for Computer Topics in Burapha University
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This document discusses three shading techniques: flat shading, Gouraud shading, and Phong shading. Flat shading gives a polygon a single color, while Gouraud shading computes vertex colors and interpolates across the polygon. Phong shading interpolates both illumination and normal vectors at each pixel for more accurate shading, though it is more computationally expensive. The document also provides references for further information about each technique.
Shading for Computer Topics in Burapha University
- 1. Presented by: Mr. Sararith Mao ID: 52031206 Computer Graphic Topic: Shading
- 2. Introduction to Shading • Shading is a process used in drawing the levels of shadow of polygon by applying media with a darker shade for darker areas, and a lighter shade for lighter areas. In this topic I will say about flat shading, flat shading, and phong shading
- 3. 1. Flat shading During scan conversion, the entire surface of one polygon has only one color. It is easy to compute and least accurate. In Open GL, we can specify flat shading through glShadeModel(GL_FLAT).
- 5. 2. Smooth or Gouraud shading Every vertices has its own normal. The concept is that smooth shading compute each vertices during scan conversion and interpolate colors across all polygon pixels depends on the normal. This method is a superior of flat shading and require more processing, but less accurate to polygon. In OpenGL, we can define smooth shading by glShadeModel(GL_SMOOTH)
- 6. High polygon count. Poor polygon count.
- 7. It computes illumination for every pixel during scan conversion and also find the interpolate normal too. Although it’s hard to do, but the result of polygon is accurate than other methods. It’s not supported in Open GL directly. 3. Phong shading
- 9. Referrences: • http://en.wikipedia.org/wiki/Phong_shading • http://en.wikipedia.org/wiki/Gouraud_shading • http://en.wikipedia.org/wiki/Shading