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I'm wondering which Stackexchange sub section this will be moved to, if this isn't the right place. But how do you create those 3D VR images you see on facebook and all that?

I have SpaceEngine and a tool in it, is to create skybox images.

So if I take the 6 fold images it snaps, and place it into a program can I create the cube map?

I've heard mettle is a program you can use, but that's expensive. Are there free programs to create skybox images?

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You can snap your 6 images in any image manipulation program, like Gimp.

Just use some math to make the right canvas.

If your snap image is 1000 X 1000 px you make a canvas 3000 x 4000

And you need a viewer.

Google this: https://www.google.com/search?q=cubic+panorama+viewer

There are some online viewers and some standalone. You can add the word "free" to the search.

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Seemingly free skybox generator software is rare. A web search "skybox generator" found 2 generators for space skyboxes. Not found one for terrestial sky.

Check these if you are not afraid to run experimental softmare.

http://alexcpeterson.com/spacescape/

https://www.reddit.com/r/gamedev/comments/3ys4vg/a_month_ago_i_released_a_free_space_skybox/

For your own skyboxes, manual work is still an option. Fill the seams at first, expand to the middle of squares.

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