Converting tree models from TreeIT to Assetto Corsa

Please note that this is a simplified description of the process. There may be better / more efficient ways to do it, but it's the only one I know ^^'

Feel free to share your feedback / remarks !

Step 1 - TreeIt

export your tree model in FBX format.

Step 2 - FBX converter

use Autodesk FBX converter to convert the FBX to binary format

Step 3 - Blender

Import the binary FBX in blender
Select all the meshes and join them (press "ctrl + j" to join). This is a mandatory step, there has to be a single mesh otherwise the process will fail.
in my case the normal textures are lost during the export from treeIt / import to Blender. I have to add them back (can be done in the "shading" perspective).
export the mesh in FBX format

Step 4 - AC Content Manager

in Content Manager, go to the "content" tab, then "tools" section, "creator tools" subsection, and select "Tree Model Converter".
select the .FBX file exported from Blender in step 3 and follow the process.
Note that the tree model obtained is set with default parameters. You can change them by opening the .bin file with an archive utility (like 7zip) and edit "tree.ini".

One day I may provide a more detailed tutorial (text + images or video). Don't know when though.

I hope this helps those who want to create tree models for AC.