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首页Advances in Real-Time Voxel-Based GI - GDC 2018.pdf
Session Description: Voxel based lighting has been around for a few years, but very few games have actually used it so far. In this session, we’re going to discuss VXGI, the Nvidia’s voxel based lighting solution, and uncover some recent improvements that aim to make it more practical and useful even for VR games on present day graphics hardware. We will also discuss how simple, planar area lights can be efficiently implemented with a combination of voxel-based occlusion and analytic irradiance calculations. Speakers: Alexey Panteleev, Senior Developer Technology Engineer & Rahul Sathe, Senior Developer Technology Engineer
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Booth #223 - South Hall
www.nvidia.com/GDC
Alexey Panteleev, Senior Developer Technology Engineer
Rahul Sathe, Senior Developer Technology Engineer
March 21, 2018
Advances in Real-Time Voxel-Based GI

2
Recap on VXGI
▪ Voxel Global Illumination
o Inspired by Sparse Voxel Octree Global Illumination (SVOGI)
o Clip-map used instead of octree
▪ Fully dynamic scene support
o Voxelizing a game-like scene from scratch takes only a few ms
o Supports multi-bounce GI through a temporal feedback loop on irradiance

3
Cornell Box Scene

4
VXGI Algorithm: Voxelization
Opacity
Emittance / Light

5
VXGI Algorithm: Tracing
Diffuse
n
Rough Specular
n
Fine Specular
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