Research note

Arches skim: material stacks, repose stabilization, rock piles

Skim of Arches #Y55KCV now imported. Key transferable mechanisms for terrain material boundaries:

  1. Material stacks: 2D grid of layered columns (bedrock/rocks/sand/water/air), thickness+type per layer #LK24UT very compact #RD3GSF Material boundaries = where a layer thins to zero.

  2. Angle-of-repose stabilization #C375DM #LFRUYP move material to neighbors where slope exceeds repose angle (sand 30–35°, rocks 40–45°), amount weighted by height excess. Simplification: merge same-kind layers, sort sand<rocks<air #AX5Q22 Gives emergent talus/beach transitions — concrete version of the “boundary = process regime change” idea in note #C8BGUG

  3. Rock piles without physics #XPNS4H Poisson-sphere Voronoi cells in a tiling cube, eroded except at random contact points (Gaussian resistance #GNZ92H so instanced rocks pack together; instantiate where Voronoi center falls in a rock layer #JRPT5M cull deep rocks #3EJGRS Moppe fit: treat gravel/sand as thin transported layers over bedrock height, sourced by flux field via Hjulström-style threshold, stabilized by repose rule as a materialization pass (not live sim — Arches is explicitly non-physical authoring, #QAV44L