What are they? Are they brushes or models? I can't seem to find anything on them at all.

(The trees on the hills on Flash)

theyre sprites generated from the alphablending texture.like grass sprites on some grass textures blends.

its a specific texture for skyboxes.

I know how to get grass started so, I guess they start the same way?

Might go test that out now!

extract vdetails.bsp out of the gcf in your dod folder and they should start popping out of specific textures, whenever you use them. No idea which ones will work though

when you make your 3d skybox, apply a texture that is something like "flash_skybox_trees" to your terrain.

An easy way to get textures etc. like this is to use vmex to decompile the maps so you can view them in Hammer.

Also use GFScape to extract all the materials out of the DoD:Source steam cache files. Then you can view the VMT sources and see how detail sprites (like the trees and usually grass/plants) is put on a specific texture.

Do you just extract the vdetails.bsp to your maps folder?

Actually I think it's named "details.vbsp" - it's not a bsp in the sense of being a map file. It goes in the upper "dod" folder.

No idea why it's called a "vbsp" file. It's just text and nothing overly magical.

I think those vegetation creating blend textures are great, it's like hey look, free grass :p now we need a skybox texture that creates houses. <---- lazy

lol maybe theres a code tweak to allow ppl to make models grow out of alphablends instead of sprites :p