round sloped-flat Ceiling appears flat when rendering I have a round room with arches around the edges. The ceiling is weird shaped, however....



It goes from flat to sloping upwards, flat to upwards, flat, upwards, flat then there is a hole in the top acting as a window. The picture shown above shows what the ceiling looks like when Viewport Shading is set to Solid.



What the ceiling currently looks like when it is rendered. The Viewport shading was set to rendered.



The top of the ceiling from outside. You can see the shadows as the ceiling slopes down and flattens out.

My problem is that the ceiling appears flat from below while rendering. I'll provide the blendfile. Is there anyway to fix the flat looking ceiling?

I decided to remove the link to the blend file. Eventually 3d Renderings will hopefully be uploaded to sites to sell. I didn't want people to download the model just to have and edit. I'm not saying anyone will, however.
A cube, a plane, a circle, a sphere... Can you tell them apart?



Impossible to tell with flat light. In this case the light comes from behind the camera lighting everything everything evenly.

We have no clue of the depth of the objects without a shadow. Our brain sees these as bidimensional objects...

Making the light have a clear direction helps our brain understand the shapes better: