PaintBlob shader from CS:GO

[piqey]

In the March 2024 Update, we got support for the SolidEnergy shader from CS:GO for increased compatibility with visuals from Portal 2 maps. It would be nice to get support for the PaintBlob shader as well, as it can be used to create a number of interesting visual effects, such as sheets of ice with a sort of pseudo-subsurface scattering:

As the PaintBlob shader was originally created for Portal 2's paint blobs and the wiki page for PaintBlob doesn't provide any VMT snippets for this screenshot, I'm going to look into reverse engineering them myself (or a similar effect with gmod-native textures). But, in the meantime, I figured it'd be best to submit this request while I work on acquiring that additional information.

[piqey]

This is the closest I could get to the screenshot:

The prop_static archways were for testing $contactshadows, but enabling that didn't seem to do anything other than make the material freak out when viewed in Hammer.

"PaintBlob"
{
	$basetexture		"nature/vostok_snow"

	$uvscale			.004

	$normalmap		"dev/watera_normal"
	$bumpstrength		1.3333

	$phongexponent		40
	$phongboost		2
	$phongexponent2		400
	$phongboost2		7

	$rimlightexponent		4
	$rimlightboost		2.2

	$opacitytexture			"detail/dt_walltexture01"
	$translucent			1
	$translucentfresnelminmaxexp		"[ 0 1 6 ]"

	$envmap			env_cubemap

	$fresnelBumpStrength	1.0

	$interior			0
//	$interiorlayer		1
	$interiorFogStrength		.00325
	$interiorFogLimit		.56
	$interiorFogNormalBoost	8.5
	$interiorBackgroundBoost	8
	$interiorAmbientScale	1
	$interiorBacklightScale	1
	$interiorColor		"[ .4 .8 1 ]"
	$interiorRefractStrength	.7667

	$nocull			1

	$contactshadows		0
}

"nature/vostok_snow" and "detail/dt_walltexture01" are textures unique to CS:GO, but any texture should work for $basetexture and any grayscale mask should work for $opacitytexture.

[piqey]

Apparently there's another shader in the CS:GO engine branch, IceSurface, which is almost the same but includes additional features.