Few days ago I was looking for a software, like the “AMD CubeMapGen” but compatible with linux, for creating a single texture from the separated pictures of each side of the cubemap.
I found that you can do something with gimp, but it isn’t as easy as it should be. So I wrote one.
It can export dds images but it doesn’t support compression yet.
Hope that someone could find it useful. Links below.
Readme: JCubemapAssembler/README.md at master · riccardobl/JCubemapAssembler · GitHub
Repo: GitHub - riccardobl/JCubemapAssembler: JCubemapAssembler is a java application that can be used to assemble six separate face images into a single cubemap and export it as a dds file.