Gouraud shading

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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.)
References in periodicals archive ?
With the new SGI V12 graphics, Octane2 workstations lead the industry in performance, drawing over 18 million 1 pixel lit depth-buffered, Gouraud-shaded triangles per second and maintaining a highly advanced pixel fill rate of 448 megapixels per second.
3 million lit, transformed polygons-per-second (50% backface removed, Gouraud-shaded, 32-bit color and Z) and delivers up to 66 million mip-mapped pixels-per-second fill rates.
6 million lit, Gouraud-shaded, Z-buffered triangles per second, with a tri-linear textured fill rate of 60 million pixels per second.
One-third of the frames are rendered as anti-aliased wireframe, and the other two-thirds as Gouraud-shaded polygons.
Each figure consists of 22,342 meshed, z-buffered, Gouraud-shaded, bilinear filtered, fogged, lit polygons.
Ultra high-speed Gouraud shading capable of generating more than 610,000 Gouraud-shaded triangles per second (50 pixel triangles, 16-bit color), more than three times the rate of competing products or more than 350,000 Gouraud-shaded Z-buffered triangles per second (50 pixel triangles, 16-bit Z-buffering, 16-bit color);
5 million-pixel resolution as the Z25, while providing a textured pixel fill rate of 46 megapixels per second -- this is for the highest quality textured pixels: trilinear interpolated, 32-bit texels, Z-buffered, and Gouraud-shaded.
The game also contains the industry's best 3-D graphics, fully textured and Gouraud-shaded.
Offering industry-leading performance at the lowest price, Kubota Pacific's scalable Denali 3D graphics and imaging subsystem can render more than one million Gouraud-shaded 24-bit 3D triangles per second.
Unlike other 3D graphics cards on the market, these pixels are trilinear interpolated, 32-bit true color, Gouraud-shaded, and Z-buffered, allowing users to create images/scenes of the highest quality and realism.
The graphics deliver up to 250K flat-shaded triangles per second, and 43K Gouraud-shaded, lighted, independent polygons per second.
Utilizing 3Dlabs' GLINT 500TX processor, the Diamond Fire GL 3000 is capable of rendering up to 500,000 gouraud-shaded polygons per second.