Is there a way of converting the 3D preset trees into multipatch feature classes? I've built up a scene to run shadow analysis, using thematic trees as a preset. However, the analysis can't run on non-multipatch 3d layers. I have tried converting the 3D trees to multipatch but i get the error:
"ERROR 050137 3D symbology must use real-world symbol sizes in order to be converted to a multipatch."
The hyperlink to this particular error doesn't bring you to an error page, just a link to the https://www.esri.com/en-us/arcgis/products/arcgis-pro/resources page which is less than helpful.
Also, you cannot force the layer to use real world sizes in it's display properties as it's greyed out.

Any ideas?