I think one of the uses of towers in traditional architecture is to
surpass the limits of visibility in 2D street space. Thus allowing
people to locate themselves relative to important places even if they
are quite removed from them. Another obvious application is in hilly
towns where some things appear in the visibility field even if they are
not visible according to 2D analysis.
Yodan
φιθεθ Sanjay Rana:
>I agree with Alasdair. My observations so far:
>
>- If one wants to query a 3D scene(view) visible from a fixed viewpoint
>then its much better to use z-buffer type approaches. Its much faster and
>sufficient to compute distances to nearest visible parts. I believe this is
>already incorporated in GIS software e.g. ArcView's 3D analyst, which uses
>an OpenGL viewer window.
>
>- There is a need to discuss what a 3D-VGA most useful for. A
>straightforward extension of 2D- VGA applications would not always make
>sense. I would like to differ though on the relevance of 3D space to people
>behaviour. I think its relevant to characterise the 3D view from a location
>because whats standing (and hanging in the air), would also effect how
>people use/perceive the space. For example, my experience of Tokyo and New
>York is made up of mostly three-dimensional memories/images that includes
>sky scrapers, high neon billboards, bridges etc.
>
>- On a more practial note, one application that could potentially benefit
>from 3D VGA is that of CCTV installation.
>
>Sanjay.
>
>
>
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