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I'm trying to bake the textures from a sculpted high poly mesh onto a low poly one, to get a PBR material applied to the low poly mesh. So far, I've baked the normal map and the roughness map, both giving satisfying results, but the colour map is giving me a hard time. The high poly mesh is composed of several PBR materials that have been applied by using weight painting. I've also texture painted on top of a metallic texture to give it a gold plated look. But a picture is better than 1000 words I guess.

enter image description here

Before going further, one thing worth mentioning is that UVs are slightly different from one mesh to another: I didn't mark any seam before sculpting my mesh, but since it's a distorted plane, I assume a projection from the front view is doing a good enough job. The same thing has been done to the low poly version to have a similar UV map.

enter image description here

Now, into the baking process. I first tried to apply the same process as I did for the normal map and the roughness : I created a new image in the low poly's shader, no alpha canal for this one, I made sure it was selected without being connected to anything else, colour space set either on sRGB or Linear (I've tried both), selected the high poly mesh first and then the low poly, baked using "selected to active". I've tried this method with both "Diffuse" and "Combined"

I've also tried to bake the 2 materials into one colour map before adding it to the low poly mesh. To do that, I placed 1 image texture node in each material pannel and baked it. The result wasn't different from the previous attempt, except that this time, if I try to use this image on the low poly, it won't fit the mesh properly due to the difference of UVs.

Anyway, here are the results I got : enter image description here (Combined bake) enter image description here (Diffuse bake)

I've played with the Extrusion and Ray distance values but it didn't change much and the actual settings are those which worked the best for my normal and roughness map. Any idea on how I can get better images than these?

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I've found the answer luckily after watching the 16484th video of the day. I'm posting the solution for those who might encounter the same issue in the future :

Make sure to turn off Metallic on your high poly mesh

This also means disconnecting any potential Metallic map you may have. Then, bake again.

Also, do not use Combine as it happens to bake lights as well. It's pretty much taking a picture of your mesh under the current lighting conditions. You don't want that most of the time. Use "Diffuse" instead.

Here is the video that saved me

https://www.youtube.com/watch?v=Yvt7sBjfc-o

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