I created a rough puzzle piece in blender so I can export a .fbx and then import into Unity to create a virtual reality puzzle but when I import it into unity there are pieces of the mesh missing but in blender everything is solid.
After I create my mesh what is the best way to make the entire mesh solid so that when I import it there aren't missing pieces. I've tried flipping the normals and smart UV unwrapping but it doesn't help much.