This tutorial shows how to create 3D terrain from heightmap + texture in Photoshop and ATLAS plugin. For this tutorial we used heightmaps and textures from https://www.3d-mapper.com. You can download your own set from a location of your choice.
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0:15 Check heightmaps
0:51 Prepare texture
2:56 Generate 3D map
3:19 Modify map
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Resources
Heightmaps: https://www.3d-mapper.com
ATLAS plugin: https://www.3d-map-generator.com