addChild(xAxis); final NPrism xTip = new NPrism(8, 0, 0.1f, 0.25f); xTip.setMaterial(material); xTip.setColor(0xffff0000); // Red addChild(yAxis); final NPrism yTip = new NPrism(8, 0, 0.1f, 0.25f); yTip.setMaterial(material); yTip.setColor(0xff00ff00); // Green addChild(zAxis); final NPrism zTip = new NPrism(8, 0, 0.1f, 0.25f); zTip.setMaterial(material); zTip.setColor(0xff0000ff); // Blue