Blender baking results do not match the look in Unity

[Katto-FunaKatu]

Hello!
Thanks for the great add-on.

I have been hoping to replicate Blender's clean rendering in Unity.
I think I am one step closer with this add-on.

However, the result baked in Blender and the look when checked in Unity do not match up a bit.
The colors seem to be slightly lighter in Unity.

I don't know if this is the right way to do it, but the generated lightmaps are assigned to emissions in Unity.

Is there any way to fix this problem :)

Bake in Blender

Check with Unity

[Katto-FunaKatu]

Progress has been made!

By re-examining the Unity and Blender rendering area, we were able to make it look much more similar!

I don't know if this is the right way to do it, but I feel it is working well.

Bake in Blender

Check with Unity

Causes

The main difference I saw was due to “color space”.

For normal textures, such as PNGs, sRGB is enabled by default when imported into Unity (you can also disable it with a check).

However, when HDR textures are imported into Unity, they are processed internally as a linear color space, and no check is displayed, nor can it be changed.

This difference resulted in a different look and feel.

Solution

The solution to this problem is to convert the HDR textures generated by The Lightmapper into PNGs in the sRGB color space and save them.

HDR_to_PNG.mp4

After this, the PNG-ized texture is assigned to the emission of the material.

Notes

For objects affected by emissions

Assign a PNG-ized texture as shown above.

For self-emitting objects

Assign a texture that is as is HDR to take advantage of the Bloom effect.

Please share if there are any flaws :)

[PiperManiaDeluxe]

A fix for Godot is to enable "HDR as sRGB" in the import settings for the lightmap.

[meenphie]

Blender is using a Tonemapper (AgX by default), so you might also want to use a tonemapper in unity when working with HDR lightmaps, I ported AgX for Unity in case you are interested:

https://github.com/meenphie/AgX-Tonemapping-Unity

I don't know if this is the right way to do it, but the generated lightmaps are assigned to emissions in Unity.

Using the Emission slot alone will make your materials too bright since Unity shaders are doing this kind of math FinalColor = everything else + Emission. You should find a shader or make your own shader and do FinalColor = Albedo * Lightmap.

Note: You may also want to use UV2 for your custom lightmaps, since UV1 will get messed up with unity batching system.