code: function (x, y, width, height) {
              var glPoints = this._glPoints;
              glPoints[0].x = x + width;
              glPoints[0].y = y;
              glPoints[1].x = x;
              glPoints[1].y = y;
              glPoints[2].x = x + width;
              glPoints[2].y = y + height;
              glPoints[3].x = x;
              glPoints[3].y = y + height;
              this.compositor.drawTriangle(glPoints, 4, true);
          }
docs: Draw a filled rectangle at the specified coordinates
  @name fillRect
  @memberOf me.WebGLRenderer.prototype
  @function
  @param {Number} x
  @param {Number} y
  @param {Number} width
  @param {Number} height