shading

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shading

the graded areas of tone, lines, dots, etc., indicating light and dark in a painting or drawing
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

shading

[′shād·iŋ]
(electronics)
Television process of compensating for the spurious signal generated in a camera tube during trace intervals.
(mapping)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

flat shading

In computer graphics, a technique for computing a one-tone shaded surface to simulate simple lighting. See Gouraud shading.


Types of Shading
Flat, Gouraud and Phong shading are the three most common types of shading used on 3D objects. (Image courtesy of Intergraph Computer Systems.)

Gouraud shading

In 3D graphics, a technique developed by Henri Gouraud in the early 1970s that computes a shaded surface based on the color and illumination at the corners of every triangle. Gouraud shading is the simplest rendering method and is computed faster than Phong shading. It does not produce shadows or reflections. The surface normals at the triangle's points are used to create RGB values, which are averaged across the triangle's surface. See flat shading and Phong shading.


Types of Shading
Flat, Gouraud and Phong shading are the three most common types of shading used on 3D objects. (Image courtesy of Intergraph Computer Systems.)

Phong shading

In 3D graphics, a technique developed by Phong Bui-Tuong in the mid-1970s that computes a shaded surface based on the color and illumination at each pixel. Phong shading is more realistic than Gouraud shading, but requires more computation. It does not produce shadows or reflections. The surface normals at the triangle's points are used to compute a surface normal for each pixel, which in turn creates a more accurate RGB value for each pixel. See flat shading and Gouraud shading.


Phong-shaded Image
This 1000-ton, 65-foot high nuclear reactor vessel in Sweden was rendered with Phong shading in MicroStation MasterPiece from Bentley Systems. For lighting effects, 86 different light sources were applied with various colors and settings. (Image courtesy of Bentley Systems, Inc. and Rolf Granstrom, ABB Tekniska Rontgencentralen AB.)








Types of Shading
Flat, Gouraud and Phong shading are the three most common types of shading used on 3D objects. (Image courtesy of Intergraph Computer Systems.)

programmable shading

The ability for users to create their own shading algorithms using a high-level script. Programmable shading can be done in software or in hardware (in the chips on the graphics card). See flat shading.
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