As mentioned above, the environments using 3D are widely being diffused everywhere. Nowadays, it is more than things like enjoying movie with family in 3D movie theater with the glasses. People, unlike the past, purchase the 3D televisions and enjoy the 3D movies at home. For another example, we can think of the general office environments. Office workers, everyday, have meetings to discuss about their jobs. They use some tools, such like presentation slides, when they give the presentations, to deliver the topics of their presentation well. They also use the large-sized screen to improve their vision in places where a lot of people are gathered. Here is what we can think of. In some specific cases, if there is a business meeting about architecture design, that needs a lot more visual effect due to the nature of architecture design, and that sometimes requires visual simulation. With the visual demonstration as pretest of the design, the participants of the meeting can come to understand well so that they can design without the smallest strain for real construction. Here is another example. There is a progress named prototype test. Through the prototype test, a product gets ready for being produced for public market. If the procedure so-called prototype test is difficult progress due to its dangerousness, it would cause enormous trouble to producing. Those cases above are getting common nowadays, and that means it is time to need something like tools for the 3D environments. However, here is another thing that should be considered. It is a fact that there are some sorts of limits which those above environments basically have. In simple language, it is not cost
effective