使用Texture2D创建Cubemap

//Define Texture2D member p_x, p_y, p_z  n_x, n_y, n_z

if (p_x.width != p_x.height) throw new System.Exception("Create Error! width != height");

var cubemap = new Cubemap(p_x.width, p_x.format, false);

var textureArr = new Texture2D[] { p_x, p_y, p_z, n_x, n_y, n_z };
for (int i = 0; i < textureArr.Length; i++)
{
    var item = textureArr[i];

    var path = AssetDatabase.GetAssetPath(item);
    var textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
    textureImporter.isReadable = true;
    textureImporter.SaveAndReimport();
}

//textureImporter.

cubemap.SetPixels(p_x.GetPixels(), CubemapFace.PositiveX);
cubemap.SetPixels(p_y.GetPixels(), CubemapFace.PositiveY);
cubemap.SetPixels(p_z.GetPixels(), CubemapFace.PositiveZ);
cubemap.SetPixels(n_x.GetPixels(), CubemapFace.NegativeX);
cubemap.SetPixels(n_y.GetPixels(), CubemapFace.NegativeY);
cubemap.SetPixels(n_z.GetPixels(), CubemapFace.NegativeZ);

cubemap.Apply();

AssetDatabase.CreateAsset(cubemap, "Assets/MyCubemap.cubemap");
AssetDatabase.SaveAssets();