Turning red/bloody NPC's eyeballs

[ubre]

I am trying to make a zombie (You can probably guess which fictional zombie by the map and the models) and I thought that bloody eyes would be a nice touch.
Now I'll just clarify that I have never done any work with modelling/texturing especially on valve stuff so I don't know what all those symbols and words mean when making a custom material, but I just looked up online and hoped it would work. Unfortunately I am not sure what happened and why this happened:

https://streamable.com/n8oq9

I am clearly targetting the eyes in the code but it looks as if it's randomized.
I might as well say that I did find why they are transparent while writing this, and it was because apparently after creating a material you can't modify it, so I just had to reload the server.
Here's the code I'm using (It's inside the ENT:Initialize):

CreateMaterial("RedEye", "VertexLitGeneric",
{
["$basetexture"] = "models/debug/debugwhite",
["$surfaceprop"] = "flesh",
["$model"] = 1
}):SetVector("$color2", Vector(255,0,0))

for k, v in pairs(self:GetMaterials()) do

if(string.find(v, "eyeball")) then

self:SetSubMaterial(k, "!RedEye")

end

end
I'm not using the code tags because they are broken and it's unbelievable that they still are. Unless it's just me.

[wyozi]

GetMaterials returns materials starting index from 1 but SetSubMaterial indices start from 0. Also did you see the note at https://wiki.garrysmod.com/page/Entity/GetMaterials about material replacement?

[ubre]

Yeah that did it, here's the updated code in case people need it:

CreateMaterial("RedEye", "VertexLitGeneric",
{
["$basetexture"] = "models/debug/debugwhite",
["$surfaceprop"] = "flesh",
["$model"] = 1
}):SetVector("$color2", Vector(255,0,0))

for k, v in pairs(self:GetMaterials()) do

if(string.find(v, "eyeball")) then

self:SetSubMaterial(k - 1, "!RedEye")

end

end

[karl-police]

Wait, I never tried to replace a material but.

you did if(string.find(v "eyeball") ok

but, there are a lot of materials named eyeball.

[ubre]

It targets only the eyeball material on an NPC and it will be used only on human models. It's so if the NPC model has a mask and no eyeball model it won't set the material for something that isn't there.