This node subtracts one terrain from another terrain. At each vertex, the value of the output terrain is the difference of the values of both input terrains.
To add a node, right click in the Graph Editor and select Create Node > Terrain Composition > Difference.
Link the Difference node to two input nodes.
If both input terrains are not the same size or the same resolution, the size and the resolution of the output terrain is determined by those of the first terrain, and the second terrain is enlarged or reduced so that its size matches the size of the output terrain exactly before being subtracted from the first terrain.
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