demo2.yml, 1479.900397s, 44 cores, 16384 samples per pixel:

Building

$ cargo build

Running

For a fast low-quality render:

$ cargo run --bin flux -- -r 32 -R 10 -g scenes/demo2.yml

For a slower but very high-quality render:

$ cargo run --bin flux -- -r 150 -d 16 -R 5 -g scenes/demo2.yml

While the graphical preview is being updated, Esc will cancel the rendering at any time.