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From Unreal Wiki, The Unreal Engine Documentation Site

Object >> Actor >> SceneCaptureActor >> SceneCaptureCubeMapActor

Package: 

Engine

This class in other games:

UDK

Place this actor in the level to capture a scene to a cube map render target texture. Among other things, this can be used to create a sky box-like effect. The capture actor itself is not actually visible in the game.

[edit] Properties

[edit] CubeMaterialInst

Type: MaterialInstanceConstant

Modifiers: transient

Material instance used to apply the target texture to the static mesh.

[edit] StaticMesh

Type: StaticMeshComponent

Modifiers: const

Used for visualizing the cube capture.

Default value: StaticMeshComponent'StaticMeshComponent0'

[edit] Default values

[edit] Subobjects

[edit] SceneCaptureCubeMapComponent0

Class: Engine.SceneCaptureCubeMapComponent

No new values.

This is where the real magic happens. Point this component's TextureTarget property to a cube map render target of your choice.

[edit] StaticMeshComponent0

Class: Engine.StaticMeshComponent