Digger – Terrain Caves & Overhangs (New Update)

Digger is a simple yet powerful tool to dig caves and overhangs in your Unity terrains directly from the Unity editor. It gives Unity terrains the power of voxel terrains.
Render pipeline compatibility

More and more AAA games add gentle overhangs and caves to their environment to make it more realistic, more interesting and more diversified.

With Digger, no more need for an external tool, no more loss of time, no more headache. It lets you create caves and overhangs in your terrain directly within the scene view, in a few clicks.

It will make you feel like you have a voxel terrain in your hands, without the downsides. It actually keeps the fast and reliable Unity’s terrain system and creates seamless cave/overhangs meshes just where needed. Internally, Digger uses voxels and Marching Cubes to create meshes, but instead of replacing the entire terrain with a voxel terrain, it creates a mix of them and gives you the best of both worlds.

https://assetstore.unity.com/packages/tools/terrain/digger-terrain-caves-overhangs-135178