Kalayaan Interactive · UE5 Plugin

Tendon

XPBD Rope & Cable Physics for Unreal Engine 5

Launching on FAB UE 5.7+

What it does

A fast, stable, Blueprint-friendly rope solver that behaves like a real cable. Built on Extended Position-Based Dynamics with the Small-Steps integration scheme — the same family of methods powering modern real-time physics research — and tuned to ship in a game.

Substepped XPBD Solver

Small-Steps integration with substepped endpoint interpolation. Stable at high stiffness without tuning iteration counts.

Coulomb Friction

SOR-based friction from Müller & Macklin's PBD paper. Ropes wrap, catch, and release with real contact behavior.

Self-Collision

Spatial-hash self-collision prevents the rope from passing through itself, without the usual performance cliff.

Custom Renderer

Dedicated scene proxy component with persistent GPU buffers. Drops the ProceduralMeshComponent dependency entirely.

Velocity-Aware Pinning

Endpoints follow fast-moving attachments without the chain stretching unrealistically or snapping visibly.

Blueprint-Ready

Drop-in actor + component. Endpoint sockets, tension readout, contact forces, and config all exposed to Blueprint.

Built for production

RopeSystem.h

class TENDON_API FRopeSystem
{
public:
    Initialize(UWorld* World, float MaxLength);
    Update(FVector A, FVector B, float Dt);

    // Rope tension at either endpoint (lambda / dt²)
    float GetTensionAtEndpoint(bool bEndpointB) const;

    // Forces the rope is exerting on contacted actors
    const TArray<FRopeContactForce>& GetContactForces() const;
};

Launching soon on FAB

Drop your email and we’ll ping you when Tendon goes live.

No spam. One email on launch day.