2 Colors on 1 object After some tutorials this is my first own object in blender -a race track for unity. The main object should be white, but the road itself should be red, without creating 2 objects.
So I marked all the road-faces and assigned them to a new Material. But somehow the white color shines through depending on the camera angle.. even if I remove the white material, the grey default color also shines through. If I separate the road to an own object, it works fine -but I don't think that this should be the solution :/

(Object Mode)


(Edit Mode)


(Face Orientation)


(Unity)
You need to slightly offset the road along the Z axis. This is what is called "Z-fighting" where the renderer does not know which material to render because the faces are overlapping, so they are randomly rendered on top of another.