Encyclopedia > Gouraud shading

  Article Content

Gouraud shading

Gouraud shading is a method used in computer graphics to simulate the differing effects of light and colour across the surface of an object.

The basic principle behind the method is to calculate the surface normals at the vertices of polygons in a 3D computer model. These normals are then averaged for all the polygons that meet at each point. Lighting computations are then performed to produce colour intensities at vertices. The lighting calculation used by Gouraud was based on the Lambertian diffuse lighting model.

These colour values are then interpolated along the edges of the polygons. To complete the shading, the image is filled by lines drawn across the image that interpolate between the previously calculated edge intensities.

This is much less processor intensive than Phong shading, but does not calculate all desirable lighting effects as accurately.

Original Publication:

[GOU 71] H. Gouraud, "Continuous shading of curved surfaces," IEEE Transactions on Computers, 20(6): 623-628.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Wheatley Heights, New York

... 95.1 males. For every 100 females age 18 and over, there are 89.3 males. The median income for a household in the town is $75,076, and the median income for a family is ...

This page was created in 66.1 ms