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Paper Title: Procedural Destruction and Topology Optimization in TyFlow: A Technical Overview of Voronoi Fracture and Connectivity Graphs

Abstract This paper explores the fracture and topology systems within TyFlow (tyFlow), a node-based simulation tool for Autodesk 3ds Max. We examine the engine’s approach to brittle fracture simulation, specifically focusing on the integration of Voronoi partitioning for geometry destruction and the underlying topology map (Connectivity Graph) that dictates structural integrity. Unlike traditional keyframe-based animation, TyFlow utilizes a procedural, event-driven architecture that allows for dynamic topology updates in real-time, enabling high-fidelity simulations of collapsing structures, concrete cracking, and rigid body dynamics with unprecedented artistic control.

Creating Realistic Cracks with TyFlow: A Quick Guide

TyFlow has become a go-to particle and VFX system inside 3ds Max for procedural destruction, debris, and fracture effects. One of the most useful—and visually convincing—effects you can create is a realistic crack propagation across a surface or object. This post walks through a practical, artist-friendly workflow to produce controlled, photoreal cracks using TyFlow, with tips for timing, detail, and rendering. tyflow crack top

Core concepts and tools

  • Voronoi/Fracture meshes: Base fragmentation pattern; TyFlow reads or generates fractured pieces.
  • Particles as drivers: Particles emitted across the top surface trigger fractures or push fragments.
  • Forces and constraints: Gravity, wind, turbulence, and glue constraints control timing and realism.
  • Collision objects: Scene elements (floor, rigid bodies) receiving impacts.
  • Secondary debris & dust: Small particles that add realism and motion readability.
  • Timing control: Using event-driven tFlow operators (Birth, Kick, Destroy, Sleep) to sequence the break.

Optimization tips

  • Bake crack-line masks and reuse them for render-time detail to avoid heavy procedural overhead.
  • Limit particle counts—use LODs and spawn particles only where visible to the camera.
  • Convert long-running TyFlow particle simulations into cached geometry for lighting/renderer stability.

What it is (and why it matters)

  • Definition: “Crack Top” refers to the effect where the top surface or crown of an object breaks into realistic fragments, often revealing inner structure or debris. In TyFlow workflows it’s typically done by combining particle-driven fracture with forces and secondary debris simulations.
  • Why use it: It produces highly believable destruction that reacts dynamically to collisions, explosions, and environmental forces—ideal for VFX, motion design, and game-prep assets where controlled but organic breakage matters.

Step-by-step workflow

  1. Prepare your base mesh
  • Start with a clean, reasonably tessellated mesh where cracks should appear (wall, concrete slab, windshield, etc.). Avoid extreme mesh densities; you’ll add detail procedurally.
  • If the object needs to break into large shards, pre-fracture it using Voronoi or RayFire to create macro pieces.
  1. Create a crack source mask
  • Decide how cracks start: a point impact, line, or random seeds.
  • Create one or more small objects (spheres, splines) where cracks originate. Position them slightly above the surface to avoid Z-fighting.
  • For natural-looking networks, scatter multiple small seeds along plausible impact paths.
  1. TyFlow particle setup for crack propagation
  • Create a TyFlow event for emitter particles. Use shape or surface emission mode so particles run along or above your surface.
  • Use an animated force (like a directional wind or vector field) pointing outward from the impact point to drive particle flow along crack directions.
  • Add age and speed operators to control particle lifetime and how fast cracks propagate.
  1. Generate crack lines from particles
  • Use TyFlow’s Shape or Spline-from-Particles operators to convert particle trajectories into splines or geometry. This gives you clean crack lines that follow particle motion.
  • Apply noise (weighted by age) to the spline to break uniformity and create small branches.
  1. Convert crack splines to geometry
  • Sweep or extrude the splines to produce thin crack geometry (or use the Renderable Spline approach for displacement/opacity).
  • For surface micro-fracture, bake these splines into a height/opacity map: render the splines to a high-resolution mask (black background, white crack lines) by using an orthographic render or texture baker.
  1. Apply the crack as a mask and displacement
  • Use the generated mask as:
    • A displacement/height map to physically separate edges slightly,
    • An opacity/roughness mask to reveal underlying material,
    • A blend mask for scattering dust and edge wear.
  • Multiply additional procedural noises over the mask to introduce micro-chips along the crack.
  1. Add debris and secondary particles
  • In TyFlow, spawn small debris particles from the crack spline at the moment the crack reaches a location (use particle age or a sample-by-spline). Emit tiny shards, dust puffs, and grit.
  • Drive debris with gravity, turbulence, and collision events so they interact with macro geometry.
  • Vary scale and lifetime for realism.
  1. Timing and choreography
  • Use TyFlow’s event delays or particle age to stagger crack propagation across the surface—small delays make the crack feel like it races outward from the impact.
  • For timed destruction (e.g., an expanding fracture before a macro collapse), tie spline growth to a larger rigid-body event so shards break away when the crack reaches them.
  1. Shading and look development
  • Create a layered material:
    • Base material for intact surface,
    • Edge shader for fresh fracture faces (higher specular, bump),
    • Dirt/soot in the recessed crack (occlusion-based, darker albedo),
    • Micro-scratches and dust blended with the crack mask.
  • Use displacement on the crack edges for subtle depth. Avoid extreme displacement on animation-ready geometry unless you bake/subdivide appropriately.
  1. Lighting and rendering tips
  • Use rim and grazing lights to emphasize crack edges and silhouette.
  • Subtle volumetric dust or screen-space particulates in cracks adds depth.
  • Render debris and fine dust in separate AOVs for compositing control.