What shader would I choose? Btw this bitmap (park_rock_mossy_dif) is the ground for my map.

What type of shader should I choose?:

C:\Program Files (x86)\Microsoft Games\Halo Custom Edition>tool structure levels
\beginner beginner
Couldn't read map file './toolbeta.map'
building intermediate geometry...
choose a type for the shader 'park_rock_mossy_dif':
1. shader_environment
2. shader_model
3. shader_transparent_generic
4. shader_transparent_chicago
5. shader_transparent_chicago_extended
6. shader_transparent_water
7. shader_transparent_glass
8. shader_transparent_meter
9. shader_transparent_plasma
choice (1-9):

Or, what's probably better to do is create your shader park_rock_mossy_dif.shader_environment in guerrilla before compiling your level. Otherwise, when you choose shader environment, it will create the shader just in the tags directory, which gets messy when there's a lot of shaders there.