Bump map not showing differences for different height I've tried three cubes with different height, and render the height map in Render View Image, the upper one is the height map, the lower one is a plane with the rendered height map.
From top-down view,

From side view

My question is why there is no difference when the height map is applied, my node steup is like this,

Edit:Slope doesn't help too much for the height, I can't tell the difference either.
I'm not sure the Z depth value is helpful here.
I used this Robin Betts' answer for the height map instead

Render the height map
Set Bump Distance to correspond to your object's max height (0,5 m in my example)
Done


Geometry with 0,5 meters max height

Generated Height map

Bump Distance with 0,5 m height