How do I make a Sky / Environmental file?

[Dragonoid.Slayer]

I have looked at some of the Sky_Blah Add-Ons, and it looks like blockland is simply stitching about 7 images, then adding some environmental specifics in the .atmosphere
I would like to make my own environmental Add-Ons, so can somebody please explain how to make one? I am a noob at coding, so kindly go into a lot of detail. :|

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[Nexus]

Do you have a skybox that you want to use already?  That is by far the hardest part of making an environmental file.  You need to have 6 images that wrap together when drawn on a cube.  You put the names of those images in a .dml file, and then put your environment settings in a .atmosphere file.  The .atmosphere file will just contain a bunch of global variables.  If you just want to edit a default skybox to have cool environmental effects, you will just want to edit this file only.

[Dragonoid.Slayer]

Do you have a skybox that you want to use already?  That is by far the hardest part of making an environmental file.  You need to have 6 images that wrap together when drawn on a cube.  You put the names of those images in a .dml file, and then put your environment settings in a .atmosphere file.  The .atmosphere file will just contain a bunch of global variables.  If you just want to edit a default skybox to have cool environmental effects, you will just want to edit this file only.

I am aware that the .atmosphere are the effects of the environment, but how exactly would I... get the images and stitch them together?

[Nexus]

I am aware that the .atmosphere are the effects of the environment, but how exactly would I... get the images and stitch them together?

Creating a skybox is something you really need external software to do, or take something you find online.  If you want to make something space themed then http://alexcpeterson.com/spacescape/ is a good option.