I made another video that makes the same terrain in Blender but splits it into 4 chunks so it can be used in mobile video games without being too many polygons:


It begins with you already having a heightmap and texture shown in my first video. Also it takes the fbx files you create in blender into Unity 3d game engine where you can put the meshes back together and add the textures. Simply drag a character controller prefab included with unity onto the map and press play to have a playable level for a video game..

At the very end it shows how to make a pattern (dirt, grass, stone, etc) and use different brushes to blend it in on the texture. You could use it to make 2d maps or clean up textures adding extra features like blended stones and stuff. Or add desert sand ground, mud, trails, etc