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I've created a 3D cup from a simple mesh cylinder and have added the solidify and subdivision modifier. I then applied the solidify modifier to the mesh to select the inside faces and create a liquid from these inside faces. I've applied a material (while also following a tutorial) and it said that by default, when creating this new mesh from the inside faces, the orientation of the normals would be inverted. The tutorial then specifies to select all vertices of the liquid mesh and do shift+n to switch the faces. It works for almost all faces except for one of the face loops that cannot be inverted so their orientation is correct.

I've inserted an image of the mesh

enter image description here

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  • $\begingroup$ Are there any duplicate or "interior" faces (faces between the "inside" and "outside" faces of the glass)? Also, are you supposed to separate (P) the liquid after duplicating the faces to make it? Have you done this? $\endgroup$ Jan 2, 2022 at 6:25
  • $\begingroup$ @ChristopherBennett I have separated the inside faces and it is now its own mesh separate from the glass, so right now its just the 2D faces that make up the liquid mesh. I don't think there overlapping faces at the red part because I have alt+left click deleted it to make sure there is nothing underneath/overlapping $\endgroup$
    – jk123
    Jan 2, 2022 at 6:34
  • $\begingroup$ hello, I don't know what happened but if Recalculate Normals doesn't work and you want to flip these faces, select them and Alt N > Flip, or please share your file: pasteall.org/blend $\endgroup$
    – moonboots
    Jan 2, 2022 at 10:22
  • $\begingroup$ @moonboots here is my file pasteall.org/blend/c75cacf385be498f92df044e627b0f8c $\endgroup$
    – jk123
    Jan 2, 2022 at 17:00

1 Answer 1

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As you can see if you put your mouse cursor over these faces and press L, this part is separate, it explains why, when you tried to recalculate the normals, they didn't flip the same way as the rest:

enter image description here

Now if this part is supposed to be connected to the rest, you can M > Merge by Distance (increase the Merge Distance up to 0.01 in the Operator box), then recalculate everything with ShiftN.

If this part is not supposed to be connected to the rest but you want to invert the normals, press AltN > Flip.

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