Hi. I'm new to Marmoset as well as baking as a whole. In one of my recent projects I've been working on, In my final bake I can see my low poly on my final bake. (As shown in the picture) Not sure how to go around this. I can provide any other information if needed I'm just stumped on what to do.
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The essential problem is that the normal map corrects for the vertex normals of the low poly mesh, this works pretty well but to be perfectly accurate you need enough resolution to represent the normal data. What you end up with is these resolution based artifacts, especially if you zoom in very far. If this is an asset that will be viewed this close, I would suggest increasing the texture resolution, or considering changing the UV layout to make more efficient use of the space if that isn't an option, such as mirroring elements where you can.
You may be able to make use of hard edges along UV borders so that the normal map doesn't have to do so much of the heavy lifting. This is explained briefly in the Best Results section of our baking tutorial, see the Hard Edges & UVs section specifically: https://marmoset.co/posts/toolbag-baking-tutorial/?page=Best Results#bestresults