Tensio: Advanced Rope Physics

Asset description

Official Resources Documentation: Support TENSIO: High-Performance DOTS Rope & Chain Physics Tensio is a cutting-edge rope and chain simulation framework designed for developers who need more than just a visual line renderer. Whether you are building a grappling hook mechanic, complex physics puzzles, or highly reactive environments, Tensio provides the industrial-grade stability required for gameplay-critical physics. Built entirely on the Extended Position Based Dynamics (XPBD) method and fully leveraging Unity's Data-Oriented Technology Stack (DOTS), Tensio simulates elasticity, stiffness, mass, and aerodynamics across hundreds of ropes simultaneously with virtually zero CPU overhead. KEY FEATURES Advanced XPBD Physics Solver Motion Interpolation: The physics solver smoothly interpolates with the render loop, completely eliminating visual ghosting for buttery-smooth rope motion at any framerate. Isometric Bending Constraints: Ropes resist unnatural folding and buckling, maintaining realistic 'U' shapes even under high compression. Fictitious Mass Scaling: Create infinitely stable heavy chains. Attach massive Rigidbody weights to the bottom of a chain without artificially stretching the top segments. Coulomb Friction & Restitution: True physical friction based on penetration depth. Ropes slide naturally across surfaces but physically "bite" and hold tight when pulled over sharp edges. Two-Way Coupling: Real physical interaction; ropes apply forces to Rigidbodies, and Rigidbodies dynamically pull on ropes. Zero-Pop Initialization: Ropes pre-simulate in the editor using actual gravity and exact zero-velocity damping. They wake up perfectly settled on the very first frame with absolutely zero start-up jitters. Intuitive Editor & Workflow Smart Debris Management: Automatically clean up severed, unpinned rope pieces during intense slicing. Choose between Simulated or highly-optimized Rigid modes, complete with smooth scale-to-zero animations to preserve performance. Unity Splines Integration: Rapidly design and route cables across your scenes using Unity’s official Splines package. 1-Click Static Mesh Baking: Instantly freeze a simulated rope at its perfect resting position and bake it into a highly optimized Static Mesh asset. Perfect for zero-cost environment dressing (power lines, vines, etc.). Teleportation Protection: Move pinned anchors freely via script or Scene View without triggering explosive physics "whip" effects. Powerful Runtime API Smart Splitting: Slice ropes at any point in real-time using splitAtWorldPosition(worldPos). Dynamic Forces: Easily apply physical impacts using AddExplosionForce or push specific particles via code. Winching & Pinning: Smoothly reel ropes in or out using the ChangeLength() helper, and dynamically drop or attach weights mid-gameplay. Procedural Rendering & Collisions Braided Geometry & Torsional Twist: Generate realistic multi-strand ropes. Apply procedural visual twist with explicit tangents for flawless URP/HDRP normal map lighting. Stretch-Reactive Twist: Physics meets art! Twist density dynamically reacts to physical tension, causing ropes to realistically uncoil when pulling heavy weights. Animated Spinning: Animate the twist offset over time to effortlessly simulate drills or rapidly rotating mechanical shafts. Visual Stress: Responsive procedural tube meshes physically thin out and change color as tension increases. Specialized chain link rendering is also included. Self & Inter-Rope Collision: Ropes will not pass through themselves, and multiple ropes can tangle and interact complexly. Aerodynamics: Built-in wind and turbulence simulation with realistic air drag. Immersive 3D Spatial Audio Dynamic Tension SFX: Procedural creaking and snapping sounds modulate pitch and volume based on real-time stress. Hear the rope strain before it breaks! 3D Spatial Tracking: Audio sources dynamically slide along the length of massive cables to stay closest to the player's AudioListener. Impact Pooling & Mixer Routing: Multiple impact sounds overlap naturally without cutting off, all fully routable to your Unity Audio Mixer. Third-Party Notice: This asset uses various audio and texture files under the CC0 1.0 Universal License; see the Third-Party Notices.txt file in the package for details. Architecture: Pure C# implementation using Unity.Collections, Unity.Jobs, and Unity.Burst. Solver Type: XPBD (Extended Position Based Dynamics) with constraint regularization. Performance: Fully multi-threaded simulation step. Zero-garbage collection during runtime (uses NativeArray and persistent allocators). Supports: Standard, URP, and HDRP (via standard Material support). Rendering:Procedural Mesh generation on the GPU/CPU boundary using Burst. Dependencies: Requires Burst and Mathematics packages (installed via Package Manager). Compatibility: Compatible with Unity 2022.3 LTS and newer. Platforms: Supports PC, Mac, Linux, Consoles, and High-End Mobile (iOS/Android) due to Burst optimization. Included: Full source code, 5 demo scenes (Grappling Hook, Bridge, Stress Test, Cutting, Winch), and PDF documentation.