G3D Innovation Engine
The G3D Innovation Engine official project page is over at Codeplex: https://g3d.codeplex.com/. This codebase has been used for many years in first-rate real-time graphics publications. Examples include:
- Hardware-Accelerated Global Illumination by Image Space Photon Mapping
- Ambient Occlusion Volumes
- Real-Time Stochastic Rasterization on Conventional GPU Architectures
This proven use makes it a good choice for graphics research implementation.