I am aware that 1 unreal unit = 1cm but I'm sure many people have found that scenes simply look too small!
Well after testing I think I think I've found a reasonable scale range, using doors.
If one was to add a standard door to UE4 you will immediately notice it feels TINY. Extremely cramped as if the player can barely squeeze through it. So using this article;
http://www.worldofleveldesign.com/categories/ue4/ue4-guide-to-scale-dimensions.php I found that it feels like a very comfortable size. So comparing that door size to a common door size you get 2 ratios.
xy ratio ~ 1.555 to 1.571
z ratio ~ 1 to 1.095
These ratios seem absolutely ridiculous, but so far they're actually working extremely well in engine. In fact many sources will claim a 300 - 400 unit height for walls feels comfortable, despite a common wall rarely going above 250cm.
I'm finding that a 1.5 xy ratio with a 1.2 z ratio is turning my very cramped scene into quite a comfortable one.
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Never mind. the z feels good but the XY is too much. Interestingly though, all the hallways look better in the larger one, but the large open spaces look worse. I'm sure the feeling of claustrophobia can be fixed with changing the FOV to be honest.
However I'm trying to imagine the scene with beds, tables chairs etc. In that case I feel that the 1:1 scale is way too small. I don't think there is a simple ratio or formulae to fix these issues, I think it is very much what feels right. for example the bottom image. The width is actually a good size, but the length is far too much. Just have to work it by eye.
changing the FOV from the default 90 to 100 helped a little, anymore than that and distortion is too great. Overall I think the scene needs to range from 1 - 1.5 times larger to look right.
Maybe if I had some VR goggles I could test it better. For now I'll stick to real world units and trust my gut.