We walk freely like in a game with the use of a keyboard or mouse. We can change materials, change floors or rooms freely, and in the case of complex design assumptions, even change buildings. A walk in combination with VR (Virtual Reality) reacts to the changes in the head height. It is supported on computers and mobile devices. It is perfect for the presentation of space or product presentation. Interactive 3D walk in VR version can be used on devices such as: Oculus Rift, HTC Vive, Samsung Gear VR, or even a smartphone with the use of popular applications with simple cardboard.