Procedural Hit Reactions System

Breathe life into your characters with Procedural Hit Reactions – a modular, lightweight, and powerful system for dynamic, physical hit responses!

No need for countless animations or complicated setups — whether you're making shooters, action RPGs, VR games, or anything in between, this asset gives you smooth, believable hit reactions with minimal effort.

This system is actively updated and evolving — many more features and improvements are on the way!

🌟 Key Features

• Bone-Specific Reactions: Easily attach reactions to any bone or body part — head, chest, arms, even props.
• Customizable Reaction Profiles: Use simple ScriptableObjects to define reaction strength, rotation, translation, blend curves, and timing.
• Directional Awareness: Make impacts feel real by reacting to incoming bullet vectors or contact points.
• Additive or Override Modes: Blend reactions into your existing Animator-driven motions — or skip animations entirely and apply procedural motion directly to Transforms.
• Advanced Blending Controls: Fine-tune blend-in/out speeds, simulate heavy impacts with Slow Blend Mode, or carry over previous reactions for ultra-smooth realism.
• Follow-Through Effects: Make connected bones (hair, weapons, gear) naturally trail behind the main impact motion.
• Plug-and-Play Projectile Integration: Easily add our included HitReactionTrigger script to any projectile, melee weapon, or explosion — and automatically trigger hit reactions on collision. Supports both Rigidbody-based and Transform-based projectiles!
• Minimal Setup, Maximum Power: No runtime rig rebuilds. No heavy Animator constraints. Just plug, configure, and react!
• Full Flexibility: Works with animated characters (Animator) or static objects — all handled procedurally through Transform overrides when needed.

🎯 Perfect For

• Third-Person Shooters
• First-Person Games
• Melee Combat Systems
• Projectile Impact Reactions ( Arrows, bullets etc. )
• VR / AR Interactions
• Explosions, impacts, and environmental destruction
• Any project needing dynamic impact feedback

💎 Why Choose Procedural Hit Reactions?

✅ Ultra-lightweight and optimized for runtime performance

✅ Fully modular — easy to customize or extend

✅ Works alongside Unity Animator or entirely Transform-driven

✅ Minimal setup time: Get up and running in minutes

✅ Clean, readable full C# source code included

✅ Full documentation, tutorials, and active Discord support

✅ Actively updated — with even more improvements coming!

🎁 Bonus

• Ready-to-go projectile and character demo scenes included
• Full C# source code included
• Supports Unity Animator layers (for clean blending)
• Free future updates

Bring dynamic, believable hit reactions to your gameobjects today!

Feel the impact — procedurally.

✨ Links

📚 Full Documentation and Tutorials

💬 Join Our Discord for Support and News

Changelog

Version 1.1 — May 2025

• ReactionProfile Overhaul: Moved all per-hit options (timing, blend behaviour, hit acceptance, axis-locks) from BodyPartReactor into ReactionProfile

•FollowObjects System: Replaced legacy followTransforms with List<FollowObject> to allow per-object rot/pos weights

• Inspector Enhancements: Migrate Legacy Settings button to convert v1.0 reactor fields into a new profile asset• Create New Profile button under the Profile header

• Migration Utility: Automatically duplicates and renames profiles when legacy values differ, preserving existing setups 

• Added UnityPackages for each render pipeline (builtin,urp,hdrp) so the demo

is playable on any render pipeline.

Version 1.0 — Initial Release

• Core procedural hit-reaction system
• Basic BodyPartReactor + HitReactionController
• HitReactionTrigger for auto-routing projectile impacts
• Sample FPSController and demo scene included