Then RIVEN we need to grab that stuff and post it here. Because I am a snarker.

I've not bothered to try out the new entity myself, but I know this discussion has occurred on many other sites before, but a Google search normally won't link you to them. So, here are some I've stumbled upon in my searches:

HL2World: "real reflections"

Interlopers: "realistic reflective floor (tutorial!)"

They describe older ways and alternative (modded) ways of making other things reflective too! (Including how to get it to work in CSS!)

At least it works in HL2. Here I have designed my map to be symmetrical except the half that uses "real world" textures. The mirror seems to duplicate the half of the room the player is in but with some fuzzy pixelation.

Ok Found it.. here is what I get when I try to compile and run a CSS map with it..

maxplayers set to 32
Heap: 256.00 Mb
Parsed 359 text messages
Couldn't find custom font file 'resource/HL2EP2.ttf'
Couldn't find custom font file 'materials/vgui/fonts/buttons_32.vbf'
execing config.cfg
Can't use cheat cvar cl_upspeed in multiplayer, unless the server has sv_cheats set to 1.
Can't use cheat cvar cl_forwardspeed in multiplayer, unless the server has sv_cheats set to 1.
Can't use cheat cvar cl_backspeed in multiplayer, unless the server has sv_cheats set to 1.
Can't use cheat cvar dsp_dist_max in multiplayer, unless the server has sv_cheats set to 1.
Can't use cheat cvar dsp_dist_min in multiplayer, unless the server has sv_cheats set to 1.
Can't use cheat cvar r_ambientfraction in multiplayer, unless the server has sv_cheats set to 1.
1 CPU, Frequency: 2.0 Ghz, Features: AuthenticAMD SSE SSE2 MMX 3DNow RDTSC CMOV FCMOV
execing valve.rc
execing game.cfg
Network: IP 24.28.176.161, mode MP, dedicated No, ports 27015 SV / 27005 CL
Spawn Server mirror
Error: Material "mqbumpmap/reflectiveglass001" uses unknown shader "lightmappedreflective"
Begin loading faces (loads materials)
End loading faces (loads materials)
execing skill1.cfg
Executing listen server config file
Incorrect price blob version! Update your server!
ERROR: mp_dynamicpricing set to 1 but couldn't download the price list!
Attempted to create unknown entity type func_reflective_glass!
Can't init func_reflective_glass
Section [Scenes]: 0 resources total 0 bytes, 0.00 % of limit (2.10 MB)
32 player server started
couldn't exec listenserver.cfg
Attempted to create unknown entity type func_reflective_glass!
Can't init func_reflective_glass
Client "{NW}Conman" connected (127.0.0.1:27005).
Connected to 127.0.0.1:27015
Adding master server 69.28.140.247:27011
Adding master server 68.142.72.250:27011

Counter-Strike: Source
Map: mirror
Players: 1 / 32
Build 3531
Server Number 1
No pure server whitelist. sv_pure = 0
CAsyncWavDataCache: 0 .wavs total 0 bytes, 0.00 % of capacity
Initializing renderer...
Connection to Steam servers successful.
VAC secure mode is activated.

{NW}Conman connected
Game will not start until both teams have players.
Scoring will not start until both teams have players
--- Missing Vgui material vgui/resource/icon_newfolder
Game will not start until both teams have players.
Dropped {NW}Conman from server (Client timed out)
Disconnect: Client timed out.
Disconnect: Client timed out.

couldn't exec userconfig.cfg
Host_WriteConfiguration: Wrote cfg/config.cfg
couldn't exec userconfig.cfg
Host_WriteConfiguration: Wrote cfg/config.cfg

CRAP.. I guess CSS is crap.. I cant use this great new tool to map with for CSS.. that sucks.. fuckin steam.

In Hammer for counter strike:source I have found a entity "Func_reflective_glass". How I can use this entity in CS:S? Sorry, my English is bad:)
You can't use it in CS:S. It's only available for games that run on the Orange Box version of Source. --Darthkillyou 16:11, 18 Dec 2008 (PST)

HOLY HAND BAG! Thats sweet! When do we get that.. cause its not in my entity list.

Ok I do have the brush entity but I do not have glass/reflectiveglass001.vmt, Where can I get this, or do I have to make it?

I did find this online..

"lightmappedreflective"
{
    "%tooltexture" "dev/flat_normal"
    "$refracttexture" "_rt_WaterRefraction"
    "$refractamount" "0"
    "$refracttint" "[.5 .5 .6]"

    "$reflecttexture" "_rt_WaterReflection"
    "$reflectamount" "0"
    "$reflecttint" "[1 1 1]"

    "$fresnelpower" "0"
    "$minreflectivity" "0.8"
    "$maxreflectivity" "1.0"

    "$normalmap" "dev/flat_normal"

    "$surfaceprop" "glass"
    "$bumpframe" "0"
} 

Is that what I need to make?

Sehnsucht said:
http://www.google.com/search?q=Func_reflective_glass&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

I know how to google. I wasn't born yesterday. That's what I mean when I said I just found out about it but my questions remain valid.

Muhnay said:
How I did mirrors was I used the CAMERA and the screen brush and made them that way.

Holy sh*t! No one posts all night, then 1 within the past hour and another post while I first typed this one. Anyway yeah, no longer a need to use camera/monitors anymore apparently. Look at this Muhnay.

How I did mirrors was I used the CAMERA and the screen brush and made them that way.

http://www.google.com/search?q=Func_reflective_glass&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1