Weapon cubemap

It is also available in some newer games through mods or natively:

• Counter-Strike: Global Offensive: Not natively supported
• Left 4 Dead 2: Not natively supported
• Portal 2: Does have it in a working condition but needs the model from another game
• Portal 2: Community Edition: Implemented natively

Note:This entity is not available in Black Mesa, as well as newer version of Counter-Strike: Source. For Black Mesa, use weapon_crossbow for checking cubemaps (look at the scope).

Implementation

If your game does not have weapon_cubemap, rifle scopes could be used, such as the hunting rifle in Left 4 Dead 2 or the AWP in CS:GO, as alternatives.
Community mods have been made to implement weapon_cubemap into games that do not support it natively:

• Counter-Strike: Global Offensive: Tutorial by TopHattWaffle and Zool Smith
• Left 4 Dead 2: Tutorial by MrFunreal

Entity Description

weapon_cubemap in Half-Life 2.

This entity gives the player a set of spheres models/shadertest/envballs.mdl, each with different reflective surfaces. It is used for checking cubemaps.

The commands to receive the weapon_cubemap (typed into the console) is either impulse 81 or give weapon_cubemap. These commands are considered cheats, meaning that sv_cheats or developer mode must be enabled for them to work.
You can switch to this weapon (after having received it) by typing use weapon_cubemap.

Tip:To equip and draw the weapon for quick work, developers can bind this command to a specific key. For instance, typing bind "X" "impulse 81"; "use weapon_cubemap" will bind it to the X key. (You may need to press it twice the first time you use it in a map.)

FGD Code

@PointClass base(Weapon,Targetname, Parentname) studio("models/shadertest/envballs.mdl") = weapon_cubemap : "Cubemap"[]