Need help with normal map baking

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#1

Hello, after finishing pyramid I tried to make my own model. So I decided to make a coca cola can. Everything went ok until I needed to normal bake it. So I have to models of a can. One is low poly, another is high poly. When I press a bake button, there is a glitch on the edge which is marked as seam. Don’t know the reason of such behaviour. Can anyone help with an advice of what I am doing wrong?
Low poly mesh:

LowPolyMesh
LowPolyMesh.PNG637×868 371 KB

LowPolyMesh2
LowPolyMesh2.PNG542×742 338 KB

High poly mesh:
HighPolyMesh
HighPolyMesh.PNG750×841 435 KB

HighPolyMesh2
HighPolyMesh2.PNG618×810 470 KB

Combined low and high poly display:
Combined
Combined.PNG551×795 351 KB

Generated normal map:
NormalMap
NormalMap.PNG687×729 132 KB

Shading settings:
Shading
Shading.PNG1022×561 65.1 KB

Low poly unwrap:
UVUnwrap
Bake settings:
BakeSettings
BakeSettings.PNG303×808 17.7 KB

Result with glitch:
Result

#2

Not sure, problem looks familiar to me.
I think it’s a problem in the normal map and how it’s mapped to the can.

Maybe you should clean up the normal map, Only using normal map for the top lid.
And remove the can side, which gives you the trouble (you don’t need it anyway).
Fix the normal map in GIMP or remove the UV-map mesh.

#3

Ok, I will try to do what you say.

#4

another problem you have with your unwrap is a lock of boarder around each island. When Blender bakes the islands, it needs a margin for overlap. try adding a margin of .05 or greater between your islands

1 Like
#5

Hi, unfortunately setting margin to .05 or greater didn’t make any effect, the glitch was still there.

#6

Maybe check normals.

#7

after examining your normal map, I can tell you that Blender thinks your normals are pointing in different directions (the color on each side of the seam should show the same on the normal map but they aren’t.) to fix this you can try the following:

  1. On your Low res model, move the seam near the top of the side to the loop which runs right along the edge of the lip.
  2. try and make the low res model just a bit bigger so that the entirety of the high res model is inside of it.
  3. try using a cage (keep the settings small, 0.01 or so)
  4. move the camera to a different angle
  5. rotate the models to place the verticle seam at 0 (zero) on the x-axis and positive y

For more info see Blender User Manual

#8

Thanks, I will try.

#9

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