Eris - Voronoi Fracture

Eris breaks convex meshes into physically plausible fragments — in the Editor with one button, or at runtime on collision, bullet impact, or however your game triggers it. Native C++ backend for fast fracture computation, a full C# scripting API for gameplay code, and complete Editor tooling for one-off destructible props.

SIMULATION TYPES (VoronoiFractureRigid)

- Dynamic (default). Falls immediately under gravity, like a normal Rigidbody.

- Sleeping. Frozen until any collision, then behaves like Dynamic.

- Inactive. Frozen until a collision's impact force (impulse magnitude, mass-aware) exceeds Activation Impact Force, then behaves like Dynamic.

- Kinematic. Never falls on its own (drive it via script/Animator) — collisions can still trigger fracture.

- Static. Same behavior as Kinematic — separate option only for naming parity with other destruction tools.

FRACTURE TRIGGERS

- Editor-time. Fracture Mesh Inspector button — one-off, pre-authored breakage; save the result as a persistent Asset or Prefab for zero runtime fracture cost.

- Runtime, Collision. VoronoiFractureRigid fractures automatically on collision, optionally gated by a Damage Threshold instead of a one-hit break.

- Runtime, Script. VoronoiFractureRuntime.FractureAt (one-line bullet-impact helper) or the full Fracture.Execute/ExecuteAndSpawn API for any custom trigger.

FRACTURE PATTERNS

- Voronoi. Classic cell fracture.

- Radial. Concentric Rings x angular Rays polar grid around an Impact Point — glass/panel-style breaks.

- Splinters. Cells stretched long along one axis — elongated shard fragments.

- Slabs. Cells stretched flat along two axes — plate/panel fragments.

SEED PLACEMENT

- Uniform. Even random placement across the mesh.

- Clustered. Seeds packed within a radius of the Impact Point — localized impact break.

- Surface Weighted. Biased toward the mesh's surface — thinner shell, thicker interior fragments.

- Density Bias. Gradient control (0-1) concentrating fragments toward the Impact Point while still covering the whole mesh.

- Custom. Implement your own seed placement via the ISeedGenerator interface.

FRAGMENT LIFECYCLE & MANAGEMENT

- Fade Types. None / SimExclude (strips Collider+Rigidbody) / MoveDown / ScaleDown / Destroy — ticked centrally by one manager, not a per-fragment component.

- Fragment Manager. Global fragment-count cap (oldest-first eviction), GameObject pooling, gravity override, Y-threshold cleanup — opt-in per fracture call.

MATERIALS & OUTPUT

- Multi-material fragmentation. Separate exterior/interior materials — interior (cap) faces get their own material automatically.

- Save Fragment Meshes as Asset / Save Fragments as Prefab. Persist fracture results for reuse instead of one-off in-memory meshes.

- Export Fragments as FBX. Inspect results in Blender/other DCC tools (optional dependency, see above).

SCRIPTING API

- Fracture.Execute/ExecuteAsync. Data-first — returns fragment meshes + volume/ centroid data, spawns nothing.

- Fracture.ExecuteAndSpawn(Async). Fractures and spawns fragment GameObjects in one call — the usual gameplay entry point.

- FractureSettings.Builder. Fluent, validating configuration from code.

PERFORMANCE

- Thread Mode. Sequential/Auto/Manual native multithreading — Auto uses all available CPU cores; affects wall-clock time only, never the fracture result.

- BVH-accelerated. Native pipeline is BVH-accelerated for meshes with 64+ triangles.

KNOWN LIMITATIONS

- Concave meshes are not supported — convex input only.

- Cluster Strength and Smoothing Iterations fields are not yet implemented (labeled as such in the Inspector, not silently ignored).

- macOS is planned but not yet available — Windows x64 only for now.