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CubeTexture Skybox
Procedural gradient skybox cubemap with reflective / refractive sphere
i The sphere reflects the skybox environment map only. For real-time reflections of other scene objects, a CubeCamera is needed (see the Cube Camera demo).
? CubeTexture

What is a CubeTexture?

Six images arranged as faces of a cube, creating a seamless 360° environment.

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As a Skybox

Assigned to scene.background, it wraps the entire scene in the cube image — the camera sits inside looking out.

As an Environment Map

Assigned to material.envMap, it gives surfaces reflective or refractive appearance based on the surrounding cubemap.

Note: This is a static environment map. Objects in the scene do not appear in each other's reflections. Use a CubeCamera for real-time inter-object reflections.