One method to make the actual construction process easier for builders is to have digital image of real-world environment whose elements are augmented (or supplemented). Virtual reality replaces the real world with simulated one, where as augmented reality takes the real world and adds to it with a 3D model of your design. Augmented reality has a wealth of design and construction uses beyond visualization, too. It can be used for design analysis to pick out clashes by virtually walking through your completed model.