public set mesh(value: Nullable<AbstractMesh>) {
        if (this._mesh === value) {
            return;
        }

        if (this._mesh && this._meshObserver) {
            this._mesh.getScene().onAfterCameraRenderObservable.remove(this._meshObserver);
        }

        this._mesh = value;

        if (this._mesh) {
            this._meshObserver = this._mesh.getScene().onAfterCameraRenderObservable.add(this._multiLine.onPointUpdate);
        }

        this._multiLine._markAsDirty();
    }

 public debug(enable: boolean) {
     // Draw axis the first time
     if (!this._axesViewer) {
         this._drawAxis();
     }
     // Display or hide axis
     if (!enable && this._axesViewer) {
         let mesh = this._obj as AbstractMesh;
         mesh.getScene().onBeforeRenderObservable.remove(this.onBeforeRenderObserver);
         this._axesViewer.dispose();
         this._axesViewer = null;
     }
 }

    private _translatePoint(): Vector2 {
        if (this._mesh != null) {
            return this._multiLine._host.getProjectedPosition(this._mesh.getBoundingInfo().boundingSphere.center, this._mesh.getWorldMatrix());
        }
        else if (this._control != null) {
            return new Vector2(this._control.centerX, this._control.centerY);
        }
        else {
            var host: any = this._multiLine._host as any;

            var xValue: number = this._x.getValueInPixel(host, Number(host._canvas.width));
            var yValue: number = this._y.getValueInPixel(host, Number(host._canvas.height));

            return new Vector2(xValue, yValue);
        }
    }