Heightmaps - Epic Wiki
# Heightmaps
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Heightmaps can be imported into UE4 in either PNG or RAW formats. The technical details of these formats are described here.
Heightmaps can be created in external terrain-generation software and image-editing software.
# Terrain Generation Software
# Image editors capable of editing and/or creating heightmaps
The Gimp will not edit or create acceptable heightmaps until version 3.0 is released. Heightmaps use a 16-bit grayscale colorspace to provide smooth gradations of terrain. The Gimp uses an 8-bit color space. While UE4 will allow you to import such a file, the results are unacceptably jagged and blocky.
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