Lightmap set to directional bake normal with too little strength

[jcostello]

Godot version

Build from PR (Calinou:lightmapgi-static-directional-fix-brightness) To have the correct energy

System information

Ubuntu with Nvidia 2060

Issue description

Lightmap set to directional bakes the normal with little to non strength

Directional

Off

Steps to reproduce

Bake lightmap from MRP with directional set to true

Minimal reproduction project

Lightmap.zip

[jcostello]

Seems that the normal map is not baked at all. If I remove the normal from the material (disabled or I lover the intensity) after the bake, there is no normal information

[jcostello]

Seems to be working in master [4c5a148]. IDK if something change but if someone whats to try this before I close the issue

[Calinou]

Indeed, it works as of 4.2.rc2:

SDFGI for comparison:

VoxelGI:

[atirut-w]

Directional lightmap seems significantly weaker :/

[Calinou]

Directional lightmap seems significantly weaker :/

I don't know if it's weaker, or if VoxelGI/SDFGI's normal influence is too strong. SDFGI has known issues on this aspect in particular.

Ideally, this should be compared against a ground truth reference renderer like Blender Cycles or Mitsuba.