Here is the .blend file
I'm fairly new to blender and am trying to model a low poly style car. I drew out the shape of the car by extruding and scaling planes. I selected groups of vertices between planes and pressed F to fill. This was working great until one of the faces was darker than all the rest. I went online to ask why and tried everything I found.
- I selected all and recalculated normals. (The normal for the triangle is perpendicular to what it should be but I could not change it.).
- I selected all vertices and merged by distance in case there were overlapping vertices.
- I selected interior faces (there were none) and tried deleting.
- I deleted all of the faces and vertices and rebuilt them to approximately the same place then filled again. Similar dark triangles appeared.