[][gi-post]

_Infinite light bounces in Cornell Box_

[DI2edd] shared his [real-time diffuse global illumination demo on /r/rust_gamedev][gi-post].

It's written in 100% Rust and uses WGPU for graphics, proving that the API

is an excellent choice even for advanced computer graphics applications.

The technique provides real time global illumination for static lambertian

geometry, and is the implementation of the 2017 paper ["Real-time Global

Illumination by Precomputed Local Reconstruction

from Sparse Radiance Probes"](https://arisilvennoinen.github.io/Projects/RTGI/index.html),

which proposes a spherical harmonics-based approach to solve the rendering equation

in real time.

In practice, this means that the expensive light transport calculations are performed

in a precomputation step, which relies on - among others - [embree-rs],

and [nalgebra] to produce a compressed

representation of the scene that is then used for lighting reconstruction at runtime.

[gi-post]: https://reddit.com/r/rust_gamedev/comments/ixocl2/real_time_diffuse_global_illumination

[DI2edd]: https://reddit.com/u/DI2edd

[embree-rs]: https://github.com/Twinklebear/embree-rs

[nalgebra]: https://github.com/dimforge/nalgebra