View source for WindowImposter

{{stub}}
'''<code>WindowImposter</code>''' accepts only [[$envmap]] which is force drawn no matter the user settings or console commands used, like <code>mat_specular 0</code>.

{{note|Does accept some parameters in {{gmod|4}}, such as [[$alpha]]}}
{{todo|Which parameters? Other branches?}}

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 <code>dev/dev_windowportal.vmt</code>, and used extensively on [[func_illusionary]] or [[func_brush]] entities in conjunction with [[func_areaportalwindow]].

{{warning|The cubemap will have broken/corrupted colors on HDR lighting if you don't have a HDR texture supplied. To fix this, you must generate a [[HDR]] version of your cubemap/skybox texture. Name this HDR version the same as your normal texture, but add <code>.hdr</code> to the name. This texture needs to be in [[VTF_(Valve_Texture_Format)#Image_data_formats|RGBA16161616F]] format. For example if your cubemap is named mystuff/coolsky.vtf, you should have the HDR version named as mystuff/coolsky.hdr.vtf. The game will automatically load the HDR version and fallback to the normal texture for LDR clients.}}

{{warning|This shader ''only'' works on [[brushes]] and [[displacement]]s.}}

== Example VMT ==

<syntaxhighlight line>
WindowImposter
{
	"$envmap" "space/space_envmap"
}
</syntaxhighlight>

[[Category:Shaders]]
[[Category:Stubs]]