Thanks for the post on forward facing trees.
I was challenged to make a forward facing tree and this is the result.
I am using Blender 2.79 and the BRIAGE_G_2.79Pckg_2-2-4 exporter.
The videos where great and the info is mostly still relevant.
The export setup is quite different as the interface is now included in Blender.
You no longer need the extra material slots as you select the correct shader in the Material tab.
This then shows how many slots are required for the Texture.
The other issue I had was the ForwardFacingQuad.png to .ace
I used the ForwardFacingQuad.ace file supplied in the download and the tree would not display with out a black shade which should be transparent. Converting the ForwardFacingQuad.png to ForwardFacingQuad.dds resolved this issue. I used the program Paint.net for the conversion.
for all textures I use Gimp 2.10.10 and export as DDS then convert with Paint.net to achieve the correct format to .DDS for Train Simulator. This make the conversion to .ace redundant.
Take up the FFTree challenge.
Ausc