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: This article by Jason Zink is a primary "special feature" listed in the Rendering Techniques section (2.4). Computing Per-Pixel Object Thickness

Shaders are usually written in specialized programming languages such as GLSL (OpenGL Shading Language), HLSL (High-Level Shading Language), or Cg (C for Graphics).

While physical copies can be hard to track down, many of the core algorithms have been expanded upon in later volumes and academic papers:

The ShaderX6 PDF covers several advanced shading techniques, including: