Custom lightmap with model

Unity Engine
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1

Hello. I have a lightmap which fits a model that was made. And to be honest, I actually have no idea what I’m doing to connect them.

In basic terms (if you can), how would I go to import the custom lightmap and get unity to know that it’s for that specific model? I’m not sure if I’m explaining this well enough. But for your own sake, if you are really interested in knowing what I mean and would like to help assist me further, I am open to sharing the project with you to take a look along with the lightmap.

I’m usually a fast learner, but with this it’s a bit tricky. Also if you prefer an easier way of communicating back & forth on this issue (or maybe some others I encounter!) I’m open to using Discord.

Thanks in advance!

Also just a random question which might come across really dumb or even ignorant but when using lightmaps, does that mean you don’t really need any lighting objects in your scene (maybe because the lightmap does that for you?) - sorry, I’m a beginner here.

2

Unity does not support custom lightmaps. I’ve seen some users in our forum using the third UV channel, and assigning an external lightmap as an emissive texture. Keep in mind that this is a workaround and not something that integrates well with out GI systems.

That being said, you could create a simple shader which would take your custom lightmap texture into account. You’d have to make sure to leave Generate Lightmap UVs bool unchecked in the Mesh Importer settings. Keep in mind that any lightmap scale-related modifications, and rebaking could result in weird offsets and other issues.