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In a VR model all parts of a scene has to be digitally constructed,
which requires extensive work for the making of the model and
highly specified and expensive hardware for the regeneration of
them.
Orientation in a VR model is not intuitive, the feeling of presence is
hard to achieve and the problem of scale is still not solved in
screen based systems.
That is, even though one moves through digital models that closely
resembles a reality, it is experienced as a scale model on a screen.
Advantage with VR-models is that they can be easily shared and
distributed.