SetOutline.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using VRTK.Highlighters;  //usingは忘れがちなので忘れずに

public class SetOutline : MonoBehaviour {

  VRTK_OutlineObjectCopyHighlighter vrtk_outline;

  void Start ()
  {
    vrtk_outline = GetComponent<VRTK_OutlineObjectCopyHighlighter>();
    vrtk_outline.Initialise();
    Color color = Color.black;
    vrtk_outline.Highlight(color);
  }
}