Leveller documents appear in a two-paned window showing a nadir (top-down) view of the heightfield and an OpenGL-based view showing the heightfield (and related elements) in 3D. Sculpting and most of the other tools can be used on either pane. Edits are reflected immediately in both views, providing an interactive feel to the modeling process. Modeling is based on a paint-program metaphor similar to Adobe Photoshop, with brushes, selection tools, etc. Textures and water level can be applied also. Heightfields can be planar (flat) or distorted using UV displacement mapping onto spheres, sphere sections, cones, cylinders, etc.
Leveller also supports raytracing, animation, and reference shape placement, although these features are secondary to its modeling abilities and were added mainly as prototyping conveniences.