Hello I need help

Hello I am making a 3d building but suddenly the walls of my building do not have volume. It seems like they are only in 2d instead of 3d.
I have uploaded a picture so you can understand what I am saying (I am new in this program)
I hope someone can help me
thanks!!

If you are using Blender, then go to Edit Mode-Mesh-Normals-Recalculate Normals. To check for incorrectly oriented faces, open the Overlay menu (it’s on the left of the x-ray toggle), and check ‘Face Orientation’.

1 Like

thank you! I will try that