Lightmapped 4WayBlend
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Lightmapped_4WayBlend is the shader used to blend the vertices of a displacement surface between four different materials. It handles four at once by using mirrored sets of parameters with "2", "3", or "4" in their name.
The pattern of the blend is defined by Hammer's alpha painting tool. The blend can be tuned between being a linear gradient and a more realistic look using the luminance of each basetexture adjusted by parameters.
Note:This shader only works on displacements.Note:This shader is only available in 
Counter-Strike: Global Offensive as of January 2014. Example
Lightmapped_4WayBlend
{
"$basetexture" "de_cbble/stone_alt/brick_a"
"$bumpmap" "de_cbble/stone_alt/brick_a_normal"
"$basetexture2" "de_cbble/stone_alt/brick_a_damaged"
"$bumpmap2" "de_cbble/stone_alt/brick_a_damaged_normals"
"$texture2_uvscale" "[1.0 1.0]"
"$texture2_lumstart" "0.0"
"$texture2_lumend" "0.8"
"$texture2_blendstart" "0.8"
"$texture2_blendend" "0.9"
"$basetexture3" "de_cbble/stone_alt/brick_a_bottom_grime"
"$texture3_blendmode" "0"
"$texture3_uvscale" "[2.0 2.0]"
"$texture3_lumstart" "0.005"
"$texture3_lumend" "0.05"
"$texture3_blendstart" "0.8"
"$texture3_blendend" "1.0"
"$basetexture4" "de_cbble/stone_alt/brick_a_top_grime"
"$texture4_blendmode" "0"
"$texture4_uvscale" "[2.0 2.0]"
"$texture4_lumstart" "0.0"
"$texture4_lumend" "0.2"
"$texture4_blendstart" "0.90"
"$texture4_blendend" "0.99"
"$detail" "detail\noise_detail_01"
"$detailscale" "[ 20 20 ]"
"$detailblendfactor" ".7"
"$detailblendfactor2" ".4"
"$detailblendfactor3" ".2"
"$detailblendfactor4" ".2"
}
Supported effects
The effects supported by LightmappedGeneric plus:
$basetexture2$texture2_uvscale$texture2_lumstart$texture2_lumend$texture2_blendstart$texture2_blendend
$basetexture3$texture3_blendmode$texture3_uvscale$texture3_lumstart$texture3_lumend$texture3_blendstart$texture3_blendend
$basetexture4$texture4_blendmode$texture4_uvscale$texture4_lumstart$texture4_lumend$texture4_blendstart$texture4_blendend