How do I fix the normals of my model from Blender3D?

I'm not great with 3D modelling so i'm doing a low poly style for my game to keep things simple. I modelled a simple arm holding a lantern that i'll eventually try and animate with some jiggle bones for the lantern and simple animations on the arm. But i'm having a problem with the normals. They look fine in Blender3D but some faces are completely black and look strange when exported to Unity.


Blender3D model


Unity model (changing the skybox/lighting settings doesn't seem to help)

I exported the model as .fbx with Z forward, Y up and unchecked 'add leaf bones;' nothing else was changed.

How can I fix this?

 

Actually the Normals are also wrong in Blender. The inverted faces have a different color.

To make this more obious, press 'N' to show the Propeties Panel. In Edit Mode you will find an option to show Normals at the bottom of that panel.

Then select them and hit 'Space' and type 'flip normals'.

You probably also want to check this page: https://docs.blender.org/manual/en/dev/modeling/meshes/editing/normals.html

Try to become familiar with the other Normal settings like 'Auto Smoothing', 'Make Normals Consistent' and the differences between Face, Vertex and Vertex-per-Face Normals. Depending on the tools you use in Blender to create your geometrie, some faces will end up with different kinds of normals and you want to smooth that out to get an even lighting later on.

 

Just select all with a and press ctrl +n

 

None of the normals are messed up though in Blender. I made sure of this before making this thread; all of the normals are facing the correct direction. If some of the faces did have flipped normals in Blender it would be pretty obvious because it would have a very dark face (and the model inside of Unity would look like it has a hole in it, rather than being black.) Something else is going on.

 

Not a Blender guy, so you'll have to translate from my Maya jargon.

Unlock the normals, then smooth them. Delete construction history and reimport to Unity.

 

Check for overlapping faces too.

 

I’ve had this exact issue appear modeling in C4D when I’ve accidentally left ngons in the model (polys with 5 or more sides). Not sure if Blender has a similar ‘remove ngons’ function, but might be worth checking out to see if that’s the problem.