VoxelGI ambient light level

[tripodsan]

Godot Version

4.6

Question

I wonder how the ambient light level is defined when VoxelGI is used. The image below shows the border of the VoxelGI probe (left), and the ambient light of the terrain outside the GI (right) is way more bright. playing with the ambient light energy, I estimate it’s at least a factor 10x darker with GI.
this is especially a problem, since I won’t be able to cover the entire terrain with GI, and when the camera is far away, the differences would be a stark contrast. I would love to to use GI, the rendering looks gorgeous in comparison, and I can even use emissive surfaces as lights.

[tripodsan]

I made a simple scene, with just the default settings, and you can also see the effect.
I disabled the default light, so the effect is more prominent. it shows that the ambient light is darker inside the VoxelGI node