The Fracture voronoi rollout contains parameters for the “fracture voronoi” fracture mode. In this mode, convex cells are generated from fracture points and converted into a fracture mesh.
Iterations: controls the number of unique cell clusters that will be generated from the fracture points, whose overall shape will be varied by the noise phase parameters.
Noise A/B phase variation: controls how noise values applied to voronoi cells will vary on a per-iteration basis.
Full mesh coverage: when enabled, the cell walls generated from the fracture points will have full coverage over the hull of the input mesh. When disabled, cell walls may not have full coverage over the hull of the input mesh, depending on their size.
Voronoi patterns generate convex cells by default. However, by culling various cell walls, concave cells can be generated - allowing for more interesting fracture patterns.
When culling cell walls, it is highly recommended to enable the “cull internal open elements” setting in the fracture meshes rollout. More information about that setting can be found in the documentation for that rollout.
Probability %: the probability that any given cell wall will be culled.
Don’t cull primary walls: when enabled, only cell walls generated in voronoi iteration 2 or above will be culled, leaving the primary cell walls intact.
Threshold: only cell walls with a surface area below this threadhold will be culled by the small walls probability.
Probability %: the probability that a given small cell wall will be culled.
Don’t cull primary walls: when enabled, only small cell walls generated in voronoi iteration 2 or above will be culled, leaving the primary cell walls intact.
Threshold: only cell walls with a surface area above this threadhold will be culled by the large walls probability.
Probability %: the probability that a given large cell wall will be culled.
Don’t cull primary walls: when enabled, only large cell walls generated in voronoi iteration 2 or above will be culled, leaving the primary cell walls intact.
X/Y/Z: these multipliers will bias the angle of voronoi cell walls along each axis. Decreasing the value for a given axis will stretch cell walls along that axis. Increasing the value for a given axis will squash cell walls along that axis.
Affect noise scale: when enabled, noise values will be scaled along each axis by the normals scale values specified. Enabling this setting keeps noise scale consistent with the scale of cell walls, along a particular axis. Disabling this setting means noise scale is indepdnent of cell wall scale.