[Therion] Cave Overlays on Google Maps Web Sites

Stacho Mudrak s.m at group-s.sk
Thu Feb 1 14:24:10 CET 2007

Quoting Julian Todd <julian at goatchurch.org.uk>:

> This file has Z-coordinates.  In googleearth it's still treated as
> flat.  I was hoping that I'd get something rendered in 3D but underneath
> the terrain, which I could see above the flat terrain if I turned the 3D
> terrain off.  This doesn't happen.  Has this been investigated?

Yes. Google Earth is able to render also absolute Z coordinate (just  
one flag can be added to the coord spec), but then you are not able to  
see caves, when terrain is turned on.

> Getting our 3D surveys rendered into the googleearth seamlessly (so we
> can throw away all our current viewers with their funny controls and
> ridiculous content-starved binary 3D formats) is something worth
> aspiring to.  However, the land will tend to obscure the caves.

All we need is "terrain transparency" slider in Google Earth :)


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