how to determine the geographical area that is shown?

CesiumJS
1

Hi,

I wonder if it is possible to determine the geographical area that is
currently being shown in a cesium viewer, even if by just an approximation?

Akos

2

See Screen Coordinates.

3

great!
did you somehow catch the event of the user moving the camera
around, zooming, etc. and call after each such movement? or were you
working with a static camera view position?

4

I save the properties of the camera and I compare it with the current camera all time on tick() function. If the camera changes (the user moved the camera or zoom) I call the getExtentView function.

5

thanks, such polling is something I thought about myself

6

Lots of people want this functionality, including me, but it’s actually pretty difficult to pull off accurately. I wrote an issue up a while ago (https://github.com/AnalyticalGraphicsInc/cesium/issues/871) hopefully Dan or someone better at Math than me can look into it in the near viewer.