SU Files

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Sketch can export two types of 3D model files DAE & KMZ and uses one master working file.

The working file is *.SKP there are various version issues.

It looks like all the data; Size, Shape, Location and Image data is stored within the *.SKP file

The DAE file has only the math data, any images are saved in a separate folder with the same name as the DAE file

The DAE file can be actioned via a Script file known as *.KML (Keyhole Markup Language )

A KML file is wriiten using an ASCII text editor see my example here

A KMZ file holds all the resources required in a compressed format and be droped into Google Earth or opened by renaming as a *.ZIP file and unzipping it

Exporting and Importing

The free version of Sketch Up can export :-

• 3D models: KMZ, DAE
• 2D rasters: JPEG, TIFF, PNG

And can import :-

• DAE, KMZ, 3DS, DEM, DDF and image formats

Wikipedia has links to KMZ DAE and KML

Other links

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https://developers.google.com/kml/documentation/kml_tut

https://developers.google.com/kml/documentation/kml_21tutorial

http://www.freemaptools.com/kml-file-creator.htm

My KML files do not work with KMZ files, says it can't read file more work here