DrawStroke.cs

// Not working. 
// Creates a batch that appears to have geometry but nothing is visible in the scene

override public void UpdateTool()
  {
      base.UpdateTool();

      Transform rAttachPoint = InputManager.Brush.Geometry.ToolAttachPoint;
      Vector3 pos = rAttachPoint.position;
      Quaternion rot = rAttachPoint.rotation;

      m_toolDirectionIndicator.transform.localRotation = Quaternion.Euler(PointerManager.m_Instance.FreePaintPointerAngle, 0f, 0f);
      uint time = 0;
      if (InputManager.m_Instance.GetCommandDown(InputManager.SketchCommands.Activate))
      {
          float pressure = 10;
          var stroke = new Stroke
          {
              m_Type = Stroke.Type.NotCreated,
              m_IntendedCanvas = App.Scene.ActiveCanvas,
              m_BrushGuid = PointerManager.m_Instance.MainPointer.CurrentBrush.m_Guid,
              m_BrushScale = 1f,
              m_BrushSize = PointerManager.m_Instance.MainPointer.BrushSize01,
              m_Color = PointerManager.m_Instance.MainPointer.GetCurrentColor(),
              m_Seed = 0,
              m_ControlPoints = new[]
              {
                  new PointerManager.ControlPoint {m_Pos=pos, m_Orient=rot, m_Pressure=pressure, m_TimestampMs=time++},
                  new PointerManager.ControlPoint {m_Pos=pos + new Vector3(1f, 0, 0), m_Orient=rot, m_Pressure=pressure, m_TimestampMs=time++},
                  new PointerManager.ControlPoint {m_Pos=pos + new Vector3(0, 1, 0), m_Orient=rot, m_Pressure=pressure, m_TimestampMs=time++},
                  new PointerManager.ControlPoint {m_Pos=pos, m_Orient=rot, m_Pressure=pressure, m_TimestampMs=time++}
              }
          };
          stroke.m_ControlPointsToDrop = Enumerable.Repeat<bool>(false, stroke.m_ControlPoints.Length).ToArray();
          stroke.Recreate(App.Scene.ActiveCanvas.AsCanvas[rAttachPoint], App.Scene.ActiveCanvas);
      }
  }