Hi Arno:
At this early phase of defining what animation might be practical to implement for models created originally in Sketchup, perhaps we might first consider what you had originally suggested:
Hi,
I did some more searching, but I didn't find ways to export animations from sketchup. Maybe I should add a simple animate feature in modelconverterx

.
Just rotating or moving objects around should be possible.
I believe that many with an interest in using Sketchup to create our scenery model geometry (and perhaps most of us ?) may be primarily wanting to create simple movements which are encoded within the MDL file when exported by ModelConverterX (aka "MCX").
If creation of a full graphical editing interface for manipulation of geometry in MCX for '
complex' animation is not feasible, then perhaps '
simple' animation such as "rotating or moving objects around" can be achieved within Sketchup itself by some methods which store the data for such transformations or central object datum RefPoint re-positioning coordinate paths within the *.SKP and/or *.KMZ file format.
Perhaps such static and dynamic geometry and coordinate data could then be interpreted and utilized by MCX when importing such objects for which the greater part of the work already has already been done by the author inside Sketchup ?
I don't think I'm the only FS developer here who would like to see use of Sketchup- and other '3rd party' 3D modeling apps- accommodated to the fullest extent possible by MCX ...as alternative(s) to use of GMAX / 3DSMAX.
MCX has already done a magnificent job of making many things possible which were previously believed to have only been achievable via GMAX / 3DSMAX and the MSFS SDK Modeling tools; perhaps it may now prove feasible to further expand the number of features MCX can convert for use in FS which were created by use of other 3D modeling apps ?
Some here may prefer (for a number of different and valid reasons) to
NOT use GMAX / 3DSMAX ...except for creating / modifying certain types of objects and content that (presently) cannot be accomplished otherwise via an alternative work-flow.
IMHO, import / modification of simple animations for geometry authored in 3rd party 3D modeling apps that is stored within the MDL by MCX when exported, would be a very valuable feature enhancement for the FS development community to have available.
GaryGB