Impact CFX is a powerful and flexible material-based collision effects system for producing audio, particle, and decal effects from physics collisions and raycasts.
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This is a paid asset, but now you can download the “Impact CFX – Collision Effects System” for FREE. Please keep in mind that this package is provided only for learning purposes or to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Impact CFX – Collision Effects System v1.5.6 (19 Jan 2026)
Impact CFX – Collision Effects System v1.5.6 (15 Sep 2025)
Impact CFX – Collision Effects System v1.5.5 (09 May 2025)
Impact CFX – Collision Effects System v1.5.4
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Description
Downloadable Demo Build (Windows)
COLLISION EFFECTS
• Play audio when physics objects collide with each other, with sounds based on the collision velocity and the objects’ materials.
• Play sliding and rolling sounds.
• Emit particles on collision.
• Leave decals behind on collision.
• Support for terrains.
• Works great with rigidbodies connected by joints and ragdolls.
FOOTSTEPS
• Utilize Impact CFX to play different footstep sounds based on the material a character is walking over.
WEAPON IMPACTS
• Use Impact CFX to play sounds, emit particles, and place decals for bullet impacts.
Note that knowledge of C# scripting is required to implement footstep and weapon impact effects done via raycasting.
PERFORMANT & CONFIGURABLE
• Impact CFX utilizes Unity’s Jobs system and Burst compiler to efficiently process effects with minimal performance impact, even with hundreds of colliding objects.
• Extensive configurability means that you can optimize Impact CFX for your specific needs.
Technical details
If you are converting from the old Impact Physics Interaction System, please take a look at the Legacy Impact Comparison and Conversion From Legacy Impact sections to help you convert your project to Impact CFX, if desired.
The following is a quick reference of all available official extensions and integrations. 3rd Party Integrations are integration packages for 3rd party systems. Impact CFX Extensions are extension packages for supporting official Unity packages like URP and HDRP, and the VFX Graph
