_GlobalSpecularTex("Global Specular", 2D) = "black" {}
      _GlobalSpecularFade("Global Specular Fade", Vector) = (50, 150, 1, 1)
      _GlobalSpecularUVScale("UV Scale", Vector) = (1, 1, 0, 0)
      _GlobalSpecularBlend("Global Specular Blend", Range(0,1)) = 1