3D GameStudio Heightmap .hmp
Terrain stored as a height grid rather than as a mesh.
What an .hmp file holds
HMP stores terrain as a heightmap, a regular lattice of elevation values that the engine turns into geometry at load time, rather than as explicit triangles. It comes from 3D GameStudio, a Windows game-creation package with a long amateur following.
Also seen as .hmb.
Commonly seen in: 3D GameStudio, terrain tooling.
| Data | Stored in HMP |
|---|---|
| Geometry | Yes |
| Materials and colour | No |
| Texture maps | No |
| Animation and rigs | No |
| Scene hierarchy | No |
| Read here | Yes |
| Written here | No |
Tested against a real file
The last sweep loaded terrain.hmp from Assimp test models through the viewer on this site: 2,048 triangles across 1 meshes and 1 materials, in 2.1 seconds. Every format's result is on the test results page, run 2026-09-08.
Convert HMP to another format
Every pairing has a page saying what survives the trip.
Other things to do with an .hmp file
Questions about HMP
How do I open an .hmp file?
Drop it into the viewer on this site and it opens in the browser, with the scene tree, the materials and the mesh statistics. Nothing is uploaded. If you want it in another program instead, convert it to GLB, which almost everything reads.
Is HMP a good format to archive in?
HMP stores geometry. Anything outside that list will not be in the file at all, so archive the original alongside it if the surfacing or the rig matters.
Does converting HMP lose quality?
Geometry is copied vertex for vertex, so the shape does not degrade. What gets lost is whatever the target format has no field for: convert to STL and the materials go, convert to OBJ and the animation goes. The comparison table on each converter page says exactly which.
Formats that hold the same things
Or go back to the full format reference.