process for creating the rotation annimation file in this post:

*********************



* Place an object into google earth from sketchup

******************************************************************************







* Create a new folder and drag the placemark into it.

* Right Click the placemark & rename it

******************************************************************************







* Copy the 1st object placemark 8 times into the same folder & rename each placemark to a unique name.

(this will create 8 instances that uses the .dae file of the 1st placemark)

* Right click on the folder and save as to your hard drive.

******************************************************************************





**********************************
put <timespan> into doc.kml file
**********************************

* Rename the .kmz to filename.zip and unzip it.

* Open the doc.kml file with a text editor

* After each placemark name put in TimeSpan code:

* increment time for each placemark name



<Placemark>
<name>315deg</name>


<TimeSpan>
<begin>0001</begin>
<end>0002</end>
</TimeSpan>


<description>26.348121° -87.748967°</description>
<styleUrl>#sn_ylw-pushpin_copy5</styleUrl>
<Model id="model_8_copy0">
<altitudeMode>relativeToGround</altitudeMode>

<Location>
<longitude>-87.74896699999999</longitude>
<latitude>26.34812093566</latitude>
<altitude>0</altitude>
</Location>

<Orientation>
<heading>315</heading>
<tilt>0</tilt>
<roll>0</roll>
</Orientation>

<Scale>
<x>1</x>
<y>1</y>
<z>1</z>
</Scale>
<Link>
<href>files/SUPreview2.dae</href>
</Link>
</Model>
</Placemark>


*******************************************************


for this annimation I also changed <heading>0</heading> for each placemark name to create rotation throughout the timespan.
(heading is same as placemark name) (0deg - 315deg)

<Orientation>
<heading>315</heading>
<tilt>0</tilt>
<roll>0</roll>
</Orientation>

****************************
completing doc.kml edit
****************************

* save edits

* put the doc.kml back into filename.zip

* rename filename.zip to filename.kmz

* confirm model with google earth.

* within Google Earth, set views, Tours etc & save final

*********************************

!!! make backup copies before saving files !!!

********************************


additional info for creating annimations by barnabu