How to transforme Window Coordinate to WGS84 ?

How can I transform Window Coordinate(Cartesian2) to WGS84 (world Cartesian3) coordinates?


Please see our picking demo:

You can use
var cartesain3Position =;


to get the Cartesian3 position on the ellipsoid where you clicked. I think it will return undefined if you click in space.



Thank you for your reply!

Because I want to achieve a measurement height function, so I need to get the
Cartesian3 position anywhere, including clicks in space. Is there a function similar
to that of OpenGL gluUnProject?

You’ll have to implement your own algorithm for clicking in space. We don’t have a calculation for that because there are infinitely many different points to which that mouse position could point to in 3D space.