HPL3

[Romulator]

May I ask you ? Can we make with Terrain editor a Cave ? I mean Like in CryEngine editor , You can make hole in terrain and then you can edit a hole (cave) Or like Far Cry editor . You make hole and then you can use some object ( cliffs, rocks).. And Can you show some making of or timelapse video ? like Amnesia TDD timelapse

Unlikely. Penumbra and Amnesia relied on solid, static objects that were made and imported into the editor. Specific terrain models that you require are made with third party modelling software, not necessarily "on-the-go" within the Level Editor.

By all means though, in a modelling program such as Blender or Maya, make a terrain or cave suitable, then export it, texture it and import it into the editor and build around it. That's the likely approach you'll need to take (Use the Model Viewer or Import the zimmerman terrain from static_objects > outside)

Also, HPL is not necessarily an engine with large amounts of capability outside of the scope of whichever game you're associating it with. In the case of HPL3, I have doubts that a terrain editor is needed for SOMA, since the game takes place in an underwater research facility.

Edit: Also, yes you can record yourself. There may be specific timelapse software, or you can use programs like FRAPS or Open Broadcast Software (OBS) to record what you are doing, then speed up the video in a video editor.