Importing Into ROBLOX Studio

[Aotrou (Shawn)]

Inconsistent normals has been covered many times on the Forums.

@Aotrou

Actual Answer

Basically, as @RegularRival said, your object’s Normals (the faces) are inside out. If you’re using Blender 2.79 (or earlier), Ctrl + N “Makes Normals Consistent” inside:

If your meshes faces are already inside, it’ll flip them all to the outside.

Additionally, I strongly suggest you move to Blender 2.8 as that is far superior to Blender 2.79 (the version you’re using now). It’s easier to learn on, and generally more efficient.