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Fig. 3 Taxis showing as poles
and be part of the GMO. To show this kind of GMO behaviour in InfraWorld, the
choice fell on modelling taxis letting them move around in the model according to
their real position. With an online link to a taxi company in the Oslo area, it is possi-
ble to retrieve data from each of the cars and their momentary position. In the model
the taxis are shown as long poles to make them clearly visible in the example, see
Fig. 3 . Clicking on one of these poles gives in our case an id and the possibility to
follow the car and activate an animation of the latest movement of the car. A lot of
other information could be relevant, but the ones chosen here are just indicating a
possible interaction and remote information. The clustering of poles in the figure is
caused by the railway station, which happens to be at that place. Even though this
is a simple example and could have been implemented in many different ways, it
shows the GMO implementation handling objects in space and time in a generic 3D
city model were GMO's were added and loaded into your browser.
3.3 Collision Detection
This example goes beyond the classical collision detection, which is controlling
whether geometry is colliding unintentionally due to the boundary representa-
tions of the modelled features intersecting. Especially within CAD software used
for construction, and perhaps since the implementation of the IFC standard, this
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