Victor wrote:
> Sorry to bother the list with such basic requests... but i have a basic
> question with the drawing of isovists. First, in the isovists i see in the
> SSL papers, i see a little diamond shaped polygon in the convex isovist...
> i searched but i don't see no reference to it... what is it's purpose?
One of the problems about construction of single isovists to represent the
'view from a space' is to decide where to do it from (which point). In the
case of a room a convention was devised to draw a diamond from the mid point
of each wall, and then to draw the union of all isovists from all locations
within that. This is actually easier than it sounds! But it is just a
convention which has the effect of leaving out the corners and looking at
the view from the body of the room.
> In the line isovists, you consider the visibility from all the line, or
> from points in the line? I say this because the drawings i see, make a
> strange shape away from the line isovist, into the perpendicular roads,
> that it shouldn't do if you considered the complete line.
There are (at least) two ways of doing this, equivalent to the union of
isovists from all the points on the line, and the intersection of isovists
from all points on the line. The former says what space you can see from at
least some point as you traverse the line, the latter says from what area
you can see the whole line.
> Maybe you could give me some hints or point me some paper that explains
> this.
I dont know of any full methods description of this.
Alan
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