Shaders in Nature\

The Nature\ folder of hl2_misc_dir.vpk contains the following shaders:

LightmappedGeneric is used for 71 materials.
LightmappedGeneric_DX9 is used for 5 materials (as a fallback shader for LightmappedGeneric and WorldVertexTransition).
Water is used for several materials.
UnlitGeneric is used for the tree_card_clump.vmt and the water_movingplane_beneath.vmt materials.

Dedicated Shaders

The following shaders are more or less exclusively used for this folder.

Only used by the cloud001c.vmt material. Also used by 2 materials in the shadertest\ folder.
Not found in released mod code.

Used by the materials toxicslime002a.vmt and water_movingplane.vmt as a fallback shader for LightmappedGeneric. Also used in the Dev\ and Glass\ folders.
Referred to twice in src\materialsystem\stdshaders\lightmappedgeneric_dx8.cpp in the released mod code.

Used by 22 materials (as a fallback shader for the Water shader) in this folder. Also used in the Dev\ folder to a lesser extent.
Referred to in src\materialsystem\stdshaders\water_dx60.cpp and src\materialsystem\stdshaders\water_dx80.cpp in the released mod code.

Used by 19 materials (as a fallback shader for the Water shader) in this folder only.
Defined in src\materialsystem\stdshaders\water_dx80.cpp in the released mod code.

Used by 15 materials (as a fallback shader for the Water shader) in this folder only.
Defined in src\materialsystem\stdshaders\water_dx81.cpp in the released mod code.

Only used by 3 materials in this folder. Also used by the dev_water3.vmt material in the Dev\ folder.
Defined in src\materialsystem\stdshaders\water.cpp in the released mod code.
Remarks from Valve: "Only used in dx90 and higher", "NOTE: These are only used by DX9 water, since forceExpensive isn't defined.", "ALSO NOTE: This *cannot* exist in the root level, because the presence of this is used to determine whether to do the reflection in the client DLL"

Used by 46 materials in this folder. Also used in the Concrete\ and Dev\ folders, to a much lesser extent.
Mostly used in materials starting with "blend".
Probably referred to in released mod code.
See WorldVertexTransition for more information.

Used only in the canal_reeds.vmt material (as a fallback shader for the WorldVertexTransition shader).
Not found in released mod code.