Realtime Rendering Techniques

Showcases a variety of realtime rendering effects. The main focus of the example is the implementation of Light Propagation Volumes (LPV), as described in the Crytek paper, Light Propagation Volumes in CryEngine 3.

Other techniques implemented include:

• Specular and normal mapping.
• Deferred shading, with a G-Buffer consisting of an albedo/specular map and a normal map.
• Directional lighting with PCF shadow mapping.
• Participating media (god rays) and GPU 'dust' particles.
• Screen-space ambient occlusion (SSAO).
• Screen-space reflections, using ray casting.

Building & Running

The program was built and tested on OSX 10.10, using a 2014 Retina MBP, with Apple LLVM 6 / clang 3.5.

1. Download glm and glfw3.
2. Unpack the zip archives in data/textures and data/models.
3. Build the sponza scene by running make scene sponza in the project root.
4. Run with ./bin/main.

The camera can be moved with the WASD keys, and rotated with the arrow keys. The directional light can be adjusted using the IJKL keys.

Different stages of the pipeline can be viewed with the number keys:

• 0: View the final composited image.
• 1: View the albedo components of the G-Buffer.
• 2: View the specular component of the G-Buffer.
• 3: View the calculated world pixel positions.
• 4: View the normal component of the G-Buffer, possibly including normal mapping.
• 5: View the ambient occlusion contribution.
• 6: View the reflections contribution.
• 7: View the shadow map (depth buffer from the POV of the directional light).
• 8: View a slice of the initial LPV injection.
• 9: View a slice of the propagated LPV contribution.

Individual effects can be toggled and adjusted with other keyboard shortcuts:

• B: Toggle reflections.
• G: Toggle LPV global illumination.
• M: Toggle shadow mapping.
• N: Toggle normal mapping.
• O: Toggle ambient occlusion.
• R: Toggle god rays / particles.
• U: Change the LPV slice viewed with 8/9.

Screenshots

All screenshots taken on Intel i7 / GTX 750M at 2048x1536.