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WindowImposter accepts only $envmap which is force drawn no matter the user settings or console commands used, like mat_specular 0.

The faces' orientation isn't taken into account when reflecting the cubemap, which makes it very convenient for making multiple fake skyboxes.

In Half-Life 2, WindowImposter is used by the material dev/dev_windowportal.vmt, and used extensively on func_illusionary or func_brush entities in conjunction with func_areaportalwindow.

Works on brushes only.

Example VMT

	"$envmap" "space/space_envmap"