Speed up GI baking

Unity Engine
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1

I’m on 2022-3 LTS with BIRP. I created a new project, threw some cubes in the scene, created a new lighting setting and baked GI and it took 40 minutes. :smile:

  1. Any way to speed this up?
  2. Let’s say I split the scene up in chunks and bake it all at once but during runtime I only load certain chunks in based on player position. They will still have their GI lighting?
  3. Should I be using unity 6 and URP instead?
2

Wow, I try building unity 6 URP samples project and its over 1 hour now and still going. :face_with_peeking_eye:

EDIT: Jesus christ, I think it’s only halfway done. Just started the Oasis scene. Guess I’ll be sticking with BIRP. :joy:

3

Make sure you are using the GPU lightmapper if you have a capable GPU. You can configure the backend in Window > Rendering > Lighting. The default is CPU, which is anywhere between 10-100x slower than GPU.

Other than that, baking just takes a while, it’s an expensive process. You can lower the sample counts or lightmap resolution to speed it up at the cost of fidelity. It shouldn’t be taking 40 minutes with just a few cubes in the scene, sounds like something is wrong with your setup. What kind of specs do you have?