****ATTENTION 2025**********************************************
New versions of TreeIt support .fbx directly, making this tutorial almost useless.
If you are interested in this topic as a bit of history, I believe the DirectX format is almost obsolete...
Let me know if you see it in use in any current games or software.
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trees require custom mesh? How do in Tree It?
Buy TreeIt for free or pay with money: http://www.evolved-software.com/treeit/treeit
DirectX is how old now? Relive the 90's premiere model format with this Blender exporter: https://github.com/DodgeeSoftware/io_scene_directx
Let me know if you want to see more on TreeIt...