- Domain-warped fBm (5 octaves + ridged octave) replaces the previous
plain 4-octave fBm — warp pass displaces sample coordinates with a
low-frequency Perlin offset, breaking grid regularity and producing
more organic ridgelines
- Rim boundary uses a small noise-driven undulation instead of a hard
radial cutoff
- 5-zone vertex colour gradient: wet dark earth → rocky brown → stone
grey → pale limestone → blue-violet crystal peaks
- Emissive crystal spire clusters (MeshStandardMaterial with accent
emissive) procedurally spawned at high-terrain locations using the
same seeded Perlin noise; cluster size, rotation, and spread are
all noise-driven for reproducibility without randomness
- Noise-displaced rocky underside replaces the plain cylinder: radial
Perlin displacement plus stalactite-style vertical pull on lower
vertices; sealed with a bottom cap disc
Fixes#233
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
