private void sliderChangedRecalculateTheMatrix() {
    double a = sliderZ.getValue() / 1000.0;
    double b = sliderY.getValue() / 1000.0;
    double c = sliderX.getValue() / 1000.0;

    matrixRx.set(MatrixTools.createRotationRxMatrix(c));
    matrixRy.set(MatrixTools.createRotationRyMatrix(b));
    matrixRz.set(MatrixTools.createRotationRzMatrix(a));
    matrix.set(MatrixTools.createRotationMatrix(a, b, c));

    parent.refreshCanvas();
  }