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I am having trouble baking a texture from a high poly mesh to a low poly mesh. Some faces remain black. low poly mesh The low poly mesh is cleanly unwrapped. There are no overlaps. There are no flipped normals. I tried baking with a cage and with extrusion. Here are my settings Settings

I have also tried with a higher number (32) of render samples.

Edit: In the meantime I found out that some faces are simply ignored (I marked the corresponding place on the texture in red). enter image description here Very annoying and probably related to the same problem are the clearly visible seams (marked in blue). I can blur them afterwards, but I can't find a way to make the transitions smoother right away.

Any advice is appreciated.

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I have since figured out that the problem was the size of the texture. In the high poly model there were 16 textures, each with 8k. With a 16K texture in the low poly model there were no more black faces. I guess Blender ignores faces if the corresponding area on the texture is too small (less than 1 px?).

So the solution is: bake a 16K texture and reduce the texture to the desired size afterwards.

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