Hi I’m newbie to Blender
I brought this charactor from Koikatsu
and I put it in Blender and clicked ‘Non Manifold’
as you see, it shows that vertex and edge are flawed, which means they are seperated.
So I merged them
but as you can see, unexpected shadow appeared like that.
I don’t know why
Why this happens? and how can I sort it out?
Hard to say by just looking at an image but I suspect there are internal faces, possibly a mouth interior which you could either separate or re-model the part where it joins the lips.
but the best solution is to re-model? really?
Is there any function to flip over those faces in Blender by one-click?
I’d say the safest way is to separate those inside faces.
I would make a copy and try the data transfer or weighted normal modifier after the operation. There’s also an addon called y.a.v.n.e. (yet another vertex normal editor).