How do I make a spherical background image from a Blender model, for example a city at night, rendered onto the inside of a sphere for use as a background?
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$\begingroup$ Why do you not want to use a skybox? It gives you the same result math.hws.edu/eck/cs424/notes2013/webgl/skybox-and-reflection/… and is easier to setup. $\endgroup$ – Leander Oct 1 '16 at 23:09
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$\begingroup$ This can be achieved with a Cycles equirectangular camera. I'm on a phone now—will post more info when I get to a real computer if this question is still open. $\endgroup$ – Ron Proctor Oct 1 '16 at 23:23
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This is similar to the question asked here: How can an equidistance, spherical panorama image be generated from Blender Cycles? See the answer for information on setting up a Cycles-based equirectangular camera.
As Leander mentioned: If you prefer to use Blender Internal or the Blender Game Engine, a Skybox is probably your best bet (simply render six 90º FOV square images, then make a cube out of the results and use that to surround your scene.
