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Left 4 Dead 1/2 Common/Uncommon Infected Nextbots

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This addon adds common and uncommon infected NextBots from Left 4 Dead 1/2 with behaviors that closely replicate their original game counterparts. Based on the original work by Jennifer / Jamie, all core code credit belongs to her. This version features huge bug fixes, performance tweaks, and has been separated into its own standalone addon.

• Uses original animations, sounds, models, and materials.
• Includes a simple AI director with Zombat included.
• Faithfully recreated AI behavior and logic, closely resembling the original Left 4 Dead infected.
• Includes uncommon infected variants like Riot, Clown, CEDA, and Mudman, etc, with unique mechanics:
• Partial compatibility with other NPCs/NextBots.
• Huge performance improvements and fixes for null entity errors.
• Limit for total infected (30 max alive at once; excess spawns are auto-removed).
• Automatically removes infected when they cluster too tightly or become stuck.
• Basic grenade/pipe bomb distraction logic.
• Headshot effects.
• Knockback behavior when taking DMG_BLAST damage.
• Supports prop climbing, allowing infected to scale obstacles like in the original game.
• Infected can collapse to the ground when idle, mimicking authentic idle behavior.
• Fire damage results in death animations and effects that replicate the original Left 4 Dead.
• Implements angry facial expressions for added realism and immersion.
• Includes mob behavior logic, enabling infected to coordinate and move in groups like a true horde.
• Gender-specific sound variations for male and female infected.
• Falling animations triggered when infected drop from significant heights.
• Includes vomit particles when they are inactive.
• Implement a ConVar to change the "difficulty" of the nextbots, this will change their attack damage/speed.
• They can break doors.
• Different attack animations depending on the enemy size (incapacitated attack animations)
• Flinch animations depending on where they are shot.
• They are very vulnerable to fire and it spreads in them.
• Infected recognize unreachable targets and will no longer attempt to chase them, reducing lag and improving performance.

• Custom blood particles (from L4D2) are a bit buggy.
• Zombat sometimes does not function properly in multiplayer.
• This addon appears to have compatibility issues with TFA Base and its related addons. If you are using TFA Base, you may encounter unusual behavior or bugs with the NextBots. Please refrain from reporting these as addon bugs.


Opinions are very important to me, if you have any positive or negative reviews I would love to read them, remember to be polite above all.

Enjoy.

Original creator and author of the entire base code - Jennifer / Jamie
Fixes, cleanup, and additional features - Lynch (me)
Workshop art, including spawn icons, thumbnails, and screenshots - Lyubir
All content used (models, animations, sounds, materials) comes from Left 4 Dead 2, which must be owned and mounted to function - Valve

TAGS Left 4 Dead 2, L4D2, Left 4 Dead, Common Infected, Uncommon Infected, AI Director, Zombie Horde, Horde, Zombies, Infected, Virus, Outbreak, Apocalypse, Survival, PvE, AI Enemies, NextBot, Scripted NPC, Custom NPC, Enemy AI, Realistic AI, Cooperative, Coop, Multiplayer, Scary, Gore, Horror, Atmosphere, Navmesh, Dynamic AI, Ambient AI, Procedural AI, L4D Zombies, L4D Horde, Tactics AI, Fire Effects, Particle Effects, Knockback, Ragdoll, Pathfinding, Group AI, Zombat, Soundtrack, Dynamic Music, Fire Spread, Door Breaking, Expressions, Flinch System, Headshots, Hit Reactions, L4D2 Mechanics, Valve, Steam Workshop


Copyright © 2025-20XX by Lynch, All rights reserved.
All trademarks are the property of their respective owners.
All content not owned or claimed by Lynch remains the property of its respective owners.
No part of this content, including files or code, may be reproduced, copied, adapted, merged, or modified without prior written consent from the original author, Lynch.
Unauthorized use or reproduction of this content may violate Valve's Terms and Conditions and Steam Workshop Rules Official Garry's Mod Wiki[wiki.garrysmod.com].