Didn't read the announcements, did you?

https://steamhost.cn/steamcommunity_com/groups/BlenderSourceTools#announcements

Blender Source tools 2.10.2 is not compatible with 2.80. Go to the Blender Source Tools group here https://steamhost.cn/steamcommunity_com/groups/BlenderSourceTools ) and download the ver 2.11 Beta and try that.

I just thought I'd post this here as an appreciation for all the work and dedication you have given to ALL the tools you have developed, released and maintained over the last 7+ years.

I know that coders are usually taken for granted and we users have a tendency to grab your products, use them and demand more. I just thought it would be a nice for once, to recognize you and thank you for your dedication.

We users would definately be in a world of hurt if it weren't for people like you.

Thank You

$nocull is useful for models that bleed into areas where a backface can bee seen, for example this car has no interior, the exterior is just a shell.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1593896632

If I had backface culling turned off, looking though the windows I would not see the back seat area of the car, I would see the outward facing paint and where the back right side is through the window would be the background. The car would look incomplete.

As Zappy said, Blender defaults to back face Culling turned off, if you turned it on, the plant would have behaved in the same manner that it did when you compiled and looked at it in HLMV.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1596062610

As both Zappy and I have pointed out, having actual mesh is a better option than using the $nocull command in a material. How you do it though is totally up to you, after all it is your model.

Zappy we can take this off line if you wish and argue all day... LOL All I'm saying is that with duplicated mesh, you run the risk of pulling the verts of one mesh through the other, which would expose the backside of the mesh to the camera and lead to clipping. If the Verts of the two meshes occupy the same space, you can end up with artifacts. Using the solidify method, you're only manipulating one mesh, the "ghost" follows along and maintains its distance from the main. Also, weight painting is easier. After the mesh is inplace, textured and weight painted, you can apply the modifier, giving you that extra mesh for front and back sides.

As you are well aware, modelling practices are personal preferences, and I think we have both made good cases for both our preferences.

ok, the context I got from your post was to dupe and flip the mesh, not the normals... Also, negative context if the item is rippled or concave/convex in nature. Best way to do something like this is with a solidify modifier. Front and back are aligned, thickness is even and normals face outward.

Zappy, if you duplicate mesh and flip it, your reversing the faces all together. If you use a solidify modifier, the mesh is thickened and the mesh is an actual reversed mirror of the upper side and the new mesh uses the same texture.

Have you added $nocull 1 to the material VMTs?

When you're looking at the model from the bottom you are most likely looking at the back faces of the mesh. $Nocull 1 pushes the textures through to the backside.

This can have negative affects on the model in ways of lighting and shadows. You might want to consider giving your mesh some thickness so the backside is actual mesh.

Looks like a weight painting problem in the track pads. Like you may have verts painted to other (wrong) pad bones.

When the New Release of Blender is actually built and released to the public, the Steam Version will be Updated. 2.80 isn't even into it's release candidates yet. Plugin Creators are scrambling to update their codes so there will be new versions that will work in 2.8 . The downloadable version from Blender.org is still in Beta.... So I don't think you'll see 2.8 here for a while.