Tried the workaround with convert to morph a while back (possibly AC19 / 20) and I recall it messed up some of the texture allignments / directions.
In the past when I've had to combine several buildings on a single site for presentation purpose, I worked with an in between PLN to publish the building as a module.
Several steps are needed:
1. set up a layer combination only exporting the layers you want to show. Typically these are your 3D modelling layers (including SEO!). You might want to exclude interior elements to keep polycount lower
2. set up a view of one story with this layer combination
3. make a publish set of this saved view to publish a multi story module file
4. make a new PLN file with only one story
5. place all the stories from the multi story MOD file one by one in this new PLN and move them in to place vertically
6. save the end result as a mod file (you can set up a publisher for this).
7. you can now place this single story mod file in your site model and move it vertically as you please
Since the original module is nested, all it takes for you to update from your single model file to your site presentation is to publish the original module again and update the 2nd module in your site file.
Remember that you have to manage attributes such as complex profiles, surfaces etc in your site presentation file along with your single model file.
Erwin Edel, Project Lead, Leloup Architecten
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