Descent levels are built from cube shaped segments, so caves and rock formations in them tend to look blocky.

DLE now has tools to refine such geometry. Segments can be split into smaller ones, with their textures, walls, triggers and objects being carried over to the new segments.

"Round Structures" smooths the tagged surface, turning angular structures into rounded ones. "Increase Surface Detail" pushes the corners of a surface in and out irregularly, which turns it into rough rock.

Both tools leave doors alone and refit the textures to the changed faces. They can be restricted to rock, water and lava textures, so the technical parts of a level stay as they are, and faces that have to stay flat can be tagged as planar.

A structure as built and after rounding it:

Rock with surface detail added, and such geometry in the game: