Virtual tour can be developed on photographic survey or 3D visualization basis. So we can show real exist space or future space.
Why is virtual tour better than usualy "plane" photo or render? Usualy "plane" pictures never show extent of space so realistic and effective as a virtual tour, and they can't make the viewer the presence effect. And also only with virtual tour can be made interacion that provide a viewer through the shown space.
You may think "why can't I use a video clip for this case"? Offcourse! But in video the viewer see only that "see" the camera and be attached to it's trajectory of moving. And in virtual tour the viewer can overview the space in 360 degree just in mouse moving, zoom-in or zoom-out at any time and at any speed if needed. Virtual tour can also be supplied by pop-up commentaries in any places of space, and it may be text, video or sound clips, and viewer can call it by mouse click at any time.
And also virtual tour of future space may be developed much more faster than 3D video clip visualisation time takes.
Like any presentation movie virtual tour can be placed on web site or writed on disk and then shown on any computer or screen.
Unfortunately virtual tours have just one minus — you can overview the space only from points which it was shooted or rendered and you can't walking there as in any video games. But this is only minus.
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