Ich hab' das Script mal rausgenommen und zurechtgebastelt...
Erstellt in <Garry's Mod Install location>\garrysmod\lua\autorun\client\ eine .lua datei und kopiert den code von unten da rein
dann gebt "showinvis" in die konsole ein zum toggeln der funktion 
Code:
if (not CLIENT) then return end
ShowInvisLoaded = true
local InvisProps = {}
local showing = false
local function GetAlpha(ent)
if (not ent) or (not ent:IsValid()) then return end
_, _, _, alpha = ent:GetColor()
return alpha
end
local function HasHasInvisMaterialerial(ent)
if (not ent) or (not ent:IsValid()) then return end
if (ent:GetMaterial() == "sprites/heatwave") or (ent:GetMaterial() == "models/effects/vol_light001") then
return true
end
return false
end
local function showprops(pl, cmd, args)
if (showing) then
for k, v in pairs(InvisProps) do
v[1]:Remove()
end
InvisProps = {}
showing = false
return
else
findhidden()
showing = true
end
concommand.Add("showinvis", showprops)
function findhidden()
for i=1,1000 do
local ent = ents.GetByIndex(i)
local ID = i
if (not InvisProps[ID]) and (ent) and (ent:IsValid()) and (ent ~= LocalPlayer()) and (ent:GetModel()) and (not ent:IsWeapon())) then
if (GetAlpha(ent) < 10) or (HasInvisMaterial(ent)) then
local newent = ents.Create("prop_physics")
if (newent) and (newent:IsValid()) then
newent:SetModel(ent:GetModel())
newent:SetPos(ent:GetPos())
newent:SetAngles(ent:GetAngles())
newent:SetColor(255, 255, 255, 180)
AddWorldTip(ID, "Here!", 3, newent:GetPos(), newent)
InvisProps[ID] = {newent, ent}
end
end
end
end
end
local nextupdate = 0
local function updateprops()
if (not showing) then return end
if(CurTime() > nextupdate) then
findhidden()
nextupdate = CurTime()+5
end
for k, v in pairs(InvisProps) do
if (v[2]:IsValid()) and (GetAlpha(v[2]) < 10) or (HasInvisMaterial(v[2])) then
v[1]:SetPos(v[2]:GetPos())
v[1]:SetAngles(v[2]:GetAngles())
if (GetAlpha(v[2]) == 0) and (LocalPlayer():GetEyeTrace().Entity == v[2]) and (EyePos():Distance(v[2]:GetPos()) < 512) then
if(v[2].GetOverlayText and v[2]:GetOverlayText() ~= "") then
AddWorldTip(v[2]:EntIndex(), v[2]:GetOverlayText(), 0.5, v[2]:GetPos(), v[1])
end
end
else
v[1]:Remove()
InvisProps[k] = nil
end
end
end
hook.Add("HUDPaint", "updateprops", updateprops)