LuxRender is a free software rendering system for photo-realistic and physicaly unbiased image synthesis. It is written in C++ and built around PBRT, providing a flexible ray tracing core and an extensible object-oriented design.

Our goal is to extend PBRT into a complete renderer for artistic use, including :

- Flexible multi-threading of integrators
- GUI with real time tonemapping controls, renderer configuration dialogs, etc...
- Robust scene file format and API, exporters for Blender and other 3D packages
- Speed optimisations with SSE/SIMD implementation
- Semi-programmabe shading/materials & GUI material editor(s)
- Physical sky/daylight model
- etc...