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ArmA 3 Terrain Builder, ArmA 3 Terrain Builder Support Forum

How to save your edits from Terrain Builder Buldozer into the actual heightmap so that they are not lost.

File → export → terrain, which saves to ASC, then you import the ASC right back in and mapframe properties → processing → rebuild terrain.

Now your buldozer edits are saved to your heightmap .ASC file for good. It is important to note that if you rebuild terrain after editing with buldozer without the export phase, you lose all the edits so be careful with that.