A fast, simple method to render sky color using gradients maps

As new rendering technologies appear, complex yet accurate methods for visual simulation are used. This can mean a performance overkill though, as such accuracy isn't required often. It's important to keep an eye in old hardware and other not­so­ capable devices (PDAs, cell phones...), as well as performance­ critical applications, which may prefer better performance by means of lowering the visual accuracy. Here a method to obtain realistic results in such cases is presented through a simple but efficient method to render the sky dome gradients.