Pure PBR Shaders adjusts how sunlight and skylight distribute across outdoor landscapes and inside caves, while calculating light bounces off surrounding blocks. Because of this, underground lighting behaves differently than vanilla Minecraft's flat light levels.
Using Skylight in Cave Entrances and Shafts
Instead of sealing every underground base completely, you can channel natural sky light underground:
1. Dig vertical shafts or widen natural cave mouths so sunlight and moonlight have a clear path inside.
2. Angle walls or staircases beneath the opening. Incoming sky light hits those surfaces and bounces further into the room based on the blocks' material properties.
3. Use lighter or smoother stone and metal accents near the base of a skylight shaft to help reflected light stay visible around corners.
Placing Artificial Lights Deep Underground
When exploring deep caves cut off from outdoor skylight, ambient lighting responds strictly to nearby block surfaces and light sources.
- Place torches, lanterns, or glowstone close to walls and ceilings rather than isolated on the floor in the middle of huge caverns, allowing light to bounce off nearby rock faces.
- Keep extra torches on hand when mining into wide, dark ravines where neither skylight nor close walls are available to bounce illumination back toward you.