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CIRT is an implementation of PRTP (Programmable RayTracing Pipeline). Mainly it is to be used as a ray-tracing equivalent of OpenGL. It allows the user to implement various ray-tracing related algorithms.
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
This project is in the field of Computer Graphics. It provides C++ classes to compute accessibility shading on 3D objects. It uses raytracing to compute accessibility values and stores the result in 2D textures maps.
Sunflow is a rendering system for photo-realistic image synthesis. It is written in Java and built around a flexible raytracing core and an extensible object-oriented design.
XJRT is an open source Java renderer with a raytracing backend. The renderer currently supports CSG and a variety of shapes and model formats. Objects can be created in Java or through XML, Java is used as the shading language for the renderer.
Simple Ray Tracer is a platform independepent 3D rendering engine using a technique known as RayTracing. The programming language is c++ and the code is object oriented, very simple, and intuitive. It provides a great foundation to learn raytracing.
LightStorm is a photorealistic multi-processor 3D rendering engine written in C/C++ that goes one step beyond Radiosity without the need for ray-tracing tecniques.
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Mythox Rendering System is an open source photorealistic renderer employing radiosity, raytracing, photon mapping, BSSRDF and will support
Max, Maya as a plugin. It will run under both Windows and *NIX.
What is HRTP anyway? HRTP is a ray tracer with lots of plugins. Why this name? HRTP stands for "Hyperion RayTracing Project". I chose this name based on Hyperion, a greek God of Light