I’ve been working a lot with Cube Maps lately.
I’m sharing the file that can convert any 360 degrees Equirectangular High Dynamic Range image to Blender Cube Maps / Environment Maps.
Sorry in advance, but the car isn’t included it’s just used here to exemplify the functionality and purpose of the converter.
It uses cycles and what it does is baking the environment captured from a cube to an image that blender can read as a Cube/Environment Map.
Cube Maps support was added in Blender 2.77 and it’s a easy way to add reflections to, for example, cars, cups, glasses, etc using blender 3D viewport in GLSL mode.
Works like this:
HDRi examples are from: http://www.hdrlabs.com/sibl/archive.html
I made the car.