A script to capture a scene to a cubemap asset for use as a sky box

SkyboxCamera.cs

using UnityEngine;
using UnityEditor;

public class SkyboxCamera : MonoBehaviour {
  const int TEXTURE_SIZE = 1024;

  void Update() {
    if(Input.anyKey) {
      Capture();
    }
  }

  void Capture() {
    Cubemap cubemap = new Cubemap(TEXTURE_SIZE, TextureFormat.ARGB32, true);
    cubemap.name = "Skybox";
    Camera camera = GetComponent<Camera>();
    camera.RenderToCubemap(cubemap);

    AssetDatabase.CreateAsset(
      cubemap,
      "Assets/Textures/Skybox/Skybox.cubemap"
    );
  }
}