text: let hexColor2Vec4 = (hexColor) => {
  	if(hexColor.startsWith('#')){
  		hexColor = hexColor.substr(1, hexColor.length -1);
  	}
  	const red = hexColor.substr(0, 2);
  	const green = hexColor.substr(2, 2);
  	const blue = hexColor.substr(4, 2);
  	const hexDoubleToString = (hexDouble) => Number.parseInt(hexDouble, 16) /255;
  	return `vec4(${hexDoubleToString(red)}, ${hexDoubleToString(green)}, ${hexDoubleToString(blue)}, 1.0)`;
  }