protected override RenderPipeline CreatePipeline()
    {
        var pipeline = new  MyScriptableRenderPipelineInstance();

        pipeline.ClearColor = clearColor;
        return(pipeline);
    }
 // 破棄時の処理
 public override void Dispose()
 {
     base.Dispose();
     instance = null;
     if (cmd != null)
     {
         cmd.Dispose();
         cmd = null;
     }
 }
 /// <summary>
 /// コンストラクタ
 /// </summary>
 public MyScriptableRenderPipelineInstance()
 {
     instance = this;
 }