Godot 4.0 gets SDF based real-time global illumination
Mircosoft Game Dev
JUNE 27, 2020
SDFGI is something akin to a dynamic real-time lightmap (but it does not requiere unwrapping, nor does it use textures). Ensure your meshes are marked as "Static Bake", then enable SDFGI in the Environment settings. What can it do? As long as walls are thicker than a voxel for a given cascade, light won't go through.
Let's personalize your content