“Previously, the game engine didn’t support point light shadows at all, but in Delve league we really wanted to introduce the moving light mechanic of the Crawler which wouldn’t work without them,” GGG says. “This is when we had the idea of using screen space shadows as a very fast way to render shadows for many point lights on screen at the same time. […] This approach ended up even better than we were expecting. The game looks a lot better lit from lower down and it’s faster for many lights than conventional shadows. We plan on using this in the main game a lot more in the future.”
Likewise, if your GPU can handle it, you’ll be able to turn on global illumination too, treating “every pixel on the screen as an individual light source that casts light on everything and receives light from everything.” Shiny.
