[BHaType]

Originally Posted by HarryPotter That is weird, I throw bile at reachable nav or common infected body, the chat still prints

Hmm... Game overwrites ChaseVictim property. Try this version

Code

PHP Code:

#pragma semicolon 1
#pragma newdecls required

#include <sourcemod>
#include <sdktools>

#include <left4dhooks>
#include <actions>
#include <sourcescramble>

MemoryPatch g_hBlockWavingAnimation;

public void OnPluginStart()
{
    GameData data = new GameData("l4d2_infected_navigation_out_of_map");
    g_hBlockWavingAnimation = MemoryPatch.CreateFromConf(data, "ChaseVictim::Update");
    delete data;
}

public void OnActionCreated( BehaviorAction action, int actor, const char[] name )
{
    if ( strcmp(name, "ChaseVictim") == 0 )
    {
        action.OnUpdate = OnUpdate;
        action.OnUpdatePost = OnUpdatePost;
    }
}

public Action OnUpdate( BehaviorAction chaseVictim, float interval, ActionResult result )
{
    if ( chaseVictim.Get(0x4844, NumberType_Int8) != 0 )
        return Plugin_Continue;
        
    chaseVictim.Set(0x4844, 0);
    BlockWavingAnimation(true);
    
    BehaviorAction attack = chaseVictim.Parent; 
    
    if ( attack == INVALID_ACTION )
        return Plugin_Continue;
    
    char szAction[ACTION_NAME_LENGTH];
    attack.GetName(szAction, sizeof szAction);
    
    PrintToChatAll(szAction);
    
    /* InfectedAttack stores victim handle at 0x34 */
    int victim = attack.Get(0x34) & 0xFFF;
    
    if ( !IsValidEntity(victim) )
        return Plugin_Continue;
    
    char name[32];
    GetEntityClassname(victim, name, sizeof name);
    
    if ( strcmp(name, "info_goal_infected_chase") == 0 )
    {
        PrintToChatAll("Infected(%i) can't reach his target...", chaseVictim.Actor);
        RemoveEntity(victim);
        
        victim = GetRandomSurvivor(1, -1);
        
        if ( victim )
        {
            /* Go attack random survivor */ 
            attack.Set(0x34, GetEntityHandle(victim));
        }
        else
        {
            attack.Set(0x34, -1);
        }
    }
    
    return Plugin_Continue;
}

public Action OnUpdatePost( BehaviorAction chaseVictim, float interval, ActionResult result )
{
    BlockWavingAnimation(false);
    return Plugin_Continue;
}

void BlockWavingAnimation( bool block )
{
    if ( block )
        g_hBlockWavingAnimation.Enable();
    else
        g_hBlockWavingAnimation.Disable();
}


stock int GetEntityHandle( int entity ) 
{
    return EntIndexToEntRef(entity) & ~(1 << 31);
} 


GameData

PHP Code:

"Games"
{
    "left4dead2"
    {
        "MemPatches"
        {
            "ChaseVictim::Update"
            {
                "signature" "ChaseVictim::Update"
                
                "linux"
                {
                    "offset"    "3916"
                    "verify"    "\x0F\x84\xA7\x02\x00\x00"
                }
                
                "windows"     
                {
                    
                    "offset"    "2427"
                    "verify"    "\x0F\x84\x9C\x00\x00\x00"
                }
                    
                "patch"        "\x90\x90\x90\x90\x90\x90"
            }
        }
        
        
        "Signatures"
        {
            "ChaseVictim::Update"
            {
                "linux" "@_ZN11ChaseVictim6UpdateEP8Infectedf"
                "windows" "\x55\x8B\xEC\x83\xEC\x68\xA1\x2A\x2A\x2A\x2A\x53\x56\x33\xF6\x8B\xD9"
            }
        }
    }
} 


Help information for everyone else who wants to find a better solution

Infected starts waving animation at 40EFD0 + 96D (ChaseVictim::Update) it compares ChaseVictim property which stores return value of Path::IsValid function, property getting set from DirectChaseVictim::Update at 3B71B7 and 3B717A (Windows offsets).

Probably the best solution is to detourPost DirectChaseVictim::Update function and check if chasing entity is vomitjar and path for it is unreachable if so delete vomitjar and set property to 1