Left 4 Dead 2

Left 4 Dead 2

Advanced Bot AI
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Update: 21 Jun @ 7:24am

1. Added feature: Fire Protection - When enabled, bots will not take damage from fire.
2. Added feature: Acid Protection - When enabled, bots will not take damage from acid.
3. Added feature: Non-Alive Protection - When enabled, bots will not take damage from non-alive (map) hazards.
4. Added feature: Non-Alive Damage Multiplier - Adjusts the damage dealt by bots when hitting non-alive objects.
5. Added feature: Teleport to [Safe Room/Rescue Vehicle] - When enabled, bots will teleport to the [Safe Room/Rescue Vehicle] after all human players have entered it. Requires manual activation.
6. Added feature: Damage Compensation Toggle - Adjusts whether, at higher difficulty levels, part of the damage from missed projectiles is transferred to the aimed target. Enabled by default.
7. Increased the upper limit for all damage multipliers to 999.
8. Increased the maximum bot skill level to 99.
9. Optimized Tank evasion logic - bots now react more sensitively in dead ends.
10. Reduced movement speed when evading Tanks.
11. Reduced the search range for infected at all difficulty levels.
12. Fixed an issue where bots picking up items might fail to share them with others.
13. Fixed an issue where items carried by bots would not load correctly when advancing to the next level.
14. Fixed an issue where some skins lacked medical pack attachments, preventing items in the backpack from being correctly bound to the bot.
15. Bots' speed when rescuing teammates, searching for defibrillators, or finding fuel in fuel missions now scales linearly with their combat skill level.
16. Starting from combat skill level 6, bots receive damage reduction against Tanks: 25% at level 6, 50% at level 7, 75% at level 8, and 100% at level 9 and above.
17. Reduced the detection angle and base detection range for common infected at combat skill levels 2 and 3.
18. Reduced the detection angle and base detection range for common infected at combat skill levels 2 and 3.

Update: 3 Jun @ 11:50am

1. Changed the localization language detection from "cl_language" to "cc_lang" to prevent mod language mismatches with menu language on Steam Deck.
2. Modified the naming of the follow range to avoid conflicts with old configurations.
3. Adjusted the pathfinding mode's follow range parameters.
4. Reduced the Bot's movement speed when dodging Tank attacks, making it slightly more reasonable in certain configurations.
5. Bots will no longer be displaced when knocked down by Tank's rock throws.
6. Adjusted an attack logic to allow Bots to attempt interrupting tongues that are pulling hanging survivors.

Updates will be paused after this release or for an extended period.

Update: 31 May @ 2:26pm

1. Added follow distance command
2. Bots will no longer automatically use first aid kits when someone is incapacitated
3. Adjusted Tank avoidance logic

Update: 27 May @ 7:29am

1. Fixed a vision range exploit, ensuring Combat Skill 1 & 2 now match their intended descriptions.
2. Fixed Bots disappearing during cutscenes.
3. Fixed Bots failing to dodge Spitter acid or Tanks on headless Linux servers (no GUI).
4. Fixed Bots getting stuck at safe room doors.
5. Fixed the "Use" command in Ping System.
6. Optimized defibrillator usage logic.
7. Improved reliability of Bots applying medkits (fixed edge-case failures).
8. Fixed Bots repeatedly swapping to melee without attacking.
9. Idle Bots now wait 30 seconds (cooldown) before handing items to others after player AFK.
10. Optimized Bot pathfinding to prevent getting stuck/left behind while looting.
11. Added pipe bomb usage when reviving teammates.

Update: 12 May @ 9:56am

1. Nerfed combat skill levels 1 and 2
2. Optimized defibrillator usage and fuel pouring behavior
3. Added medkits to the script's resource pickup pool
4. Improved item pickup behavior
5. Adjusted Tank avoidance mechanics
6. Added toggles for Bot item passing and safe door closing in the menu
7. Enhanced fire and acid avoidance behavior
8. Fixed timer update issues causing abnormal behavior on 100-tick servers

Update: 4 May @ 3:47pm

1. **Mod Compatibility**:
- Added support for *Borderlands Loot Beams [Server Mod]*
- Full coexistence achieved

2. **Action Smoothing**:
- Optimized delays during:
• Defibrillator use
• Fuel pouring actions

3. **Tank Proximity Response**:
- At difficulty tiers 4-5:
• Bots will teleport to safe spots when too close to Tank

4. **New Rescue Mechanic**:
- Added configurable rescue teleport:
• Warps to incapacitated survivors after timeout

Update: 4 May @ 3:41pm

update addoninfo.txt

Update: 2 May @ 5:09pm

1. **Reintroduced Features**:
- Restored distance-based teleportation
- Added configurable teleport distance command

2. **New Protection System**:
- Added toggle for lethal damage protection (falls/high-damage attacks)

3. **Damage Multipliers**:
- New configurable damage scaling against:
• Special Infected
• Tanks
• Witches
• Common Infected

4. **Gas Can Behavior Fix**:
- Optimized pouring animation interruptions

5. **Finale AI Improvements**:
- Enhanced bot follow behavior during:
• Safe room finales
• Rescue mission endings

Update: 30 Apr @ 1:00pm

add three command

Update: 30 Apr @ 9:38am

1. **Bot Movement Logic Overhaul**:
- Replaced `m_vecBaseVelocity` with `CommondABot` API
- Removed A* path validation in Navigator
*Pros*: More natural movement via vanilla bot behavior
*Cons*: May still get stuck (requires Unstick system)

2. **Improved Object Avoidance**:
- Adjusted collision avoidance parameters for `CommondABot`
- Smoother and more natural dodging than previous version

3. **Tank Combat AI Upgrade**:
- Revamped escape logic in dead ends
- Bots now choose higher-survival-rate paths against Tank charges

4. **Targeting System Fixes**:
- Fixed aiming behavior conflicts
- Resolved issues in:
• Targeting
• Survivor rescues
• Special Infected shoves
• General melee actions

5. **Difficulty System Rework**:
- Removed "Balance Mode" and "FullPower Mode"
- New 5-tier strength system (1-5):
• Progressive improvements in:
- Vision range
- Enemy detection
- Melee engagement distance
- Special Infected push mechanics

6. **CVar Cleanup**:
- Removed deprecated console variables

7. **Linux Server Fix**:
- Resolved menu functionality issues on Linux servers

8. **Temporary Removal**:
- Disabled distance-based teleportation

9. **UI Consolidation**:
- Integrated multiple commands into menu system