// Start with cylinder base:
final Cylinder base = new Cylinder("base", 4, 16, _width * 0.75, _length - _lengthGap);
base.getMeshData().translatePoints(0, 0, (_lengthGap + _length) * 0.5);
attachChild(base);
base.updateModelBound();
// Add the pyramid tip.
final double tipLength = _length / 2.0;
final Pyramid tip = new Pyramid("tip", 2 * _width, tipLength);
tip.getMeshData().translatePoints(0, _tipGap + _length + 0.5 * tipLength, 0);