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Holes

The Holes operation cuts holes in the terrain inside its mask, for cave and tunnel entrances, or for openings where a mesh replaces the terrain.

Action
Cut makes holes. Fill closes holes that are already there: holes cut by stamps above it in the Hierarchy, or holes in the target's base.
Threshold
The mask strength, from 0.01 to 0.99, from which the terrain is cut or filled. A hole is either open or closed: there's no partial hole, so the mask only decides where the edge falls.

Trees and Details operations never place anything on a hole, whichever stamp cut it. Details can also keep a distance from the edges of holes with Hole Edge Padding (%) in their Detail Source.

Fast to edit

A stamp whose operations are only Holes, Trees and Details rebuilds without touching the heights or the painting of the terrain, so it updates quickly.

Cut an opening under a mesh

  1. Create a stamp near the mesh, for example by drawing a small outline.
  2. In the layer's Mask Composition, set the first fill to Mesh and assign the mesh's Mesh Filter to Source Mesh, so the mask covers the area under it.
  3. In Stamps, set the operation to Holes with Action set to Cut.

Use Fill in a stamp lower in the Hierarchy to close part of a hole that another stamp cut.