MEOWABO

#include <sourcemod>
#include <sdktools>

public Plugin:myinfo =
{
    name = "Engineer ThirdView",
    author = "Ice :D",
    description = "Ce plugin permet changer son mode de vue",
    version = "1.0",
    url = "http://engineer.redby.fr"
}

public OnPluginStart()
{
    RegConsoleCmd("say", Command_Say) // It's override the say command ;P
}

// THe console command
public Action:Command_Say(client, args)
{
    new String:text[192]
    GetCmdArgString(text, sizeof(text))

    new startidx = 0
    if (text[0] == '"')
    {
        startidx = 1
        /* Strip the ending quote, if there is one */
        new len = strlen(text);
        if (text[len-1] == '"')
        {
            text[len-1] = '\0'
        }
    }
    if (StrEqual(text[startidx], "!thirdperson"))
    {
        ActiveThirdPerson(client);
    }
    if (StrEqual(text[startidx], "!firstperson"))
    {
        ActiveFirstPerson(client);
    }


    /* Let say continue normally */
    return Plugin_Continue
}

public IsClientConnectedIngameAlive(client) // If player is alive and ingame but now u can make better with SM function
{
    if(IsClientConnectedIngame(client))
    {

        if(IsPlayerAlive(client) == true && IsClientObserver(client) == false)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    else
    {
        return false;
    }
}

public IsClientConnectedIngame(client)
{

    if(client > 0 && client <= MaxClients){

        if(IsClientInGame(client) == true){

            return true;

        }else{

            return false;

        }

    }else{

        return false;

    }

}

public ActiveThirdPerson(client){ //Simple function

    if(IsClientConnectedIngameAlive(client)){

        SetEntPropEnt(client, Prop_Send, "m_hObserverTarget", 0);
        SetEntProp(client, Prop_Send, "m_iObserverMode", 1);
        SetEntProp(client, Prop_Send, "m_bDrawViewmodel", 0);
    }

}

public ActiveFirstPerson(client){

    if(IsClientConnectedIngameAlive(client)){

        SetEntPropEnt(client, Prop_Send, "m_hObserverTarget", -1);
        SetEntProp(client, Prop_Send, "m_iObserverMode", 0);
        SetEntProp(client, Prop_Send, "m_bDrawViewmodel", 1);
    }
}