hl2 grass sprites

Hello, i was just wondering if anyone knew how to create the grass seen in hl2. I know it is made using sprites, but what i dont know is which spite it is made with, any help would be very helpfull.

Refrence pic:

I believe they are automatically placed by the engine depending on the texture you use. You won't see them ingame unless either model detail is high or your running directx 8 or something or other...

thanks that helps, and also makes sense, right now im mapping on my crappylaptop and can only run on low deatail, and can only support directx 7

Yeah they're supposed to be automatically created with the displacement textures...but they don't. I get an error when I compile complaining that the models could not be found (they are actually prop_details). Any clues as to why?

Placing detail props : 0...1...2...3...4..Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
.5.Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
..6...7...8...Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
Material NATURE/BLENDDIRTGRASS005A uses unknown detail object type coastline_grass01!
9...10

Have a look here on how to have BSP automatically place these grass models.