Cubemaps (Source 2)
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An example of specular reflections on some models (exaggerated through
r_showenvcubemap).A cubemap is a texture that represents a three-dimensional rendering of an area. 
Source 2 has env_cubemap and env_cubemap_box entities as sampling points to generate these textures, which are then integrated into the map file. Cubemaps, when built, are reflected on materials that use the $envmap parameter (surfaces such as reflective glass, tiles, water, etc.) A map without built or existing env_cubemap or env_cubemap_box entities will instead use other kinds of "reflections" that don't properly depict it.
Building cubemaps
[Todo]