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now gnu-ized, gcc-4.7.4 or gcc-10.2.0
A raytracer does not require custom code for (shadows, mirrors) like GL: it uses physics to simulate light to make realistic images, leaving one to specify only what is in the scene. (at a cost of speed)
Rayshade is a 1990's raytracer, a great one back then (and still useful).
Rayshade has an excellent easy to read yet informative User's Guide that other's could not help but copy from.
Imagin Raytracer is a multithreaded command line raytracer
Imagin Raytracer is a portable and multithreaded raytracer designed to run on all Posix systems. With its many features and its ease of use, it makes it possible to create quickly realistic images and animations.
NEWS: now gnu-ized, get it from:
http://sourceforge.net/projects/rayshade/
Rayshade is a 1990's raytracer, a great one back then. It has value in support of existing software and raytrace scene files, which ranges from legacy files to existing CAD software that can export 3D scenes Rayshade can build a scene for.
Files Section has a patch allowing Rayshade to build in Linux more fully / less errors than the tiny redhat patch that can be found.
A 3d game engine based on a realtime software raytracer. Currently, the following features are available : primary rays, shadows, cel shading and phong shading. Recommended hardware : modern CPU (such as Intel's core i5 or AMD FX models). This library will be used later on to develop a game. Work in progress.
Cross platform raytracer that accepts scene description scripts written in GML. The scripts have the ability to handle functions, recursion and binding.