The Fracture planes rollout contains parameters for the “fracture planes” fracture mode, as well as any other modes which generate intermediate fracture planes for their fracture meshes (ex: edge fracture mode).
Fracture planes are initially scattered at the center of any fracture points generated by the specified fracture mode. Then, based on the current fracture mesh settings, they are subdivided prior to any noise that is applied and finally are used to fracture the input mesh.
Count: the number of fracture planes to generate at a given fracture point.
Local/absolute: controls the reference coordinate system that the fracture planes will be spread within.
Radius: controls the maximum spread radius that the fracture planes will be spread within.
X/Y/Z %: controls the percentage of per-axis effect the spread radius will have on the fracture planes.
Orientation mode: controls which axis of the input mesh the fracture planes will be aligned to. “[Default]” mode will use the up vector of the fracture points as the alignment vector, which may not be oriented to a particular axis, depending on the fracture mode (for example, fracture planes of the hull fracture mode will be aligned to the nearest convex hull surface normal(.
Local/absolute: controls the reference coordinate system that the fracture planes will be aligned within.
Divergence: controls the amount of orientation divergence that will be applied to the fracture planes.
X/Y/Z %: controls the percentage of per-axis effect the divergence will have on the fracture planes.
Full coverage: when enabled, the fracture planes will expand to cover the plane-oriented bounds of the underlying input mesh’s convex hull. This ensures that all fracture planes will fully cross the input mesh surface boundary, leading to more consistent fracturing. When disabled, depending on the size parameters, planes may not fully cross the mesh surface boundary and therefore may not generate a fracture at those locations.
Length/depth: the size of the fracture planes when full coverage is disabled.
[Noise A/B] Element-space: when selected, noise distortion applied to planar cutting meshes will be applied in the coordinate space of the input mesh element (direction of noise displacement from initial plane mesh surface will be independent of plane mesh orientation).
[Noise A/B] Mesh-space: when selected, noise distortion applied to planar cutting meshes will be applied in the coordinate space of the input mesh (direction of noise displacement from initial plane mesh surface will be independent of plane mesh orientation).
[Noise A/B] Plane-space: when selected, noise distortion applied to planar cutting meshes will be applied in the coordinate space of the planar mesh (direction of noise displacement from initial plane mesh surface will be dependent on plane mesh orientation).
Affect X/Y/Z %: controls how much influence noise values will have on displacement of fracture mesh vertices, relative to the corresponding local fracture plane axis.