CoolRay
Open Source Raytracer with a scene description language that provides constructs for programming like loops and functions. Its written in C++ and runs on Windows and Linux/Unix.
The DRay Ray Tracer.
A ray tracer supporting multithreaded rendering, global illumination with photon mapping & final gather, and tone mapping. Limited source code available.
FAQ for realtime raytracing
The FAQ about speed optimization for raytracing for use in realtime raytracing.
Flamingo
Plug-in for Rhino, uses both raytracing and radiosity to create single-frame images and animations. Product description, gallery, training, evaluation download, and purchasing. For Windows.
FuzzyPhoton - The Raytracing Repository
Information about raytracing in general, with a how-to section and an A-Z reference. Technical articles and a gallery of images renderd with the VRWorld4 raytracer developed by the author, and humour.
GRT Raytracer
Raytracing system written in Common Lisp. It trys to become good classical raytracer: reasonably efficient, with a good selection of primitives, advanced texturing capabilities, animation support, and probably integration of the scripting environment with some GUI tools.
Internet Raytracing Competition
Regular awards for best raytraced still images and animations submitted by the public. Site includes most recent winners, voting on the current round, and the topic and rules for submitting to the next round.
Introduction to Ray Tracing
The introduce of ray tracing. Also known as ray casting, determines the visibility of surfaces by tracing imaginary rays of light from the viewer's eye to the objects in the scene.
Java Ray Tracer
Java ray tracing engine distributed under the GNU Public License. Images, screenshots, download, and feature list.
Java Ray Tracer
Java ray tracing engine distributed under the GNU General Public License. Images, screenshots, download, and feature list.
Kray
Freeware raytracer with subsurface scattering, global illumination and many other features. Product details, downloads, gallery, and tutorial using the software.
Laurens Lapre's Webpages
Home of the Lparser, the program reads a Lsystem description and processes it into a 3d form which can then be outputted in several formats, including VRML, DXF and POV.
Light in C++
A C++ class library available as source code implementing a physically correct renderer. Working on Unix and Windows.
Lightflow Rendering Interface
An object oriented library with API in C++ and Python for synthetic rendering, which provides a common environment and description language to treat light distribution in three dimensional spaces. Available for Linux and Windows.
Radiance
A raytracer trying to aid lighting designers and architects by predicting the light levels and appearance of a space prior to construction. It uses a hybrid approach of Monte Carlo and deterministic ray tracing. Available for Unix.
Ray tracing in Wikipedia
A overview non technical article on ray tracing also covering some history of the subject.
Ray Tracing Introduction from SIGGRAPH
A basic introduction to building a ray tracer, with some pointers to more advanced subjects at the end.
Ray Tracing News Guide
Lots of information on ray tracing. Updated once or twice a year.
RayChase
Fast raytracer that will render random images and display them on the desktop. Tested on KDE, Gnome, WindowMaker, and Enlightenment. One can also write the output to an image file (to interactively updating web pages for example). Versions exist for FreeBSD and Linux.
Rayshade
An extensible system for creating ray-traced images. It is written in C, yacc, and lex, and runs on Unix, AmigaOS, OS/2, DOS and Older MacOS.
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