The Fracture hull rollout contains parameters for the “fracture hull” fracture mode.
Points: the number of random fracture points to generate on the convex hull of an input mesh. A fracture mesh will then be placed at every generated fracture point.
Depth: fracture meshes will be placed at this depth along negative surface normal of each random fracture point. Larger values will move fracture meshes inward towards the center of the mesh hull.