ZBrushCentral

Optimization with normal, height, displacement maps to low poly

Optimization question
The gist is this: if I apply a normal, height and displacement map to an object, I can get a low-poly model with high detail, this works with characters or plants, but I need to create a house, but when applying maps to an object, nothing changes except the texture
I applied all the maps to a cube with 6 polygons, but I got nothing except the texture, how can I make the cube become very detailed with such a polygon count

I think you’ll need more geometry to displace correctly. Six polys doesn’t sound like enough.

I don’t know much about Unreal, but can you apply dynamic displacement?