plot (0,0) · mutate · gen 1 · fitness 0.712
Four-fold anisotropic dendrite crystals nucleate and expand into undercooled melt; secondary sidebranches coarsen and arrest at mutual grain collision boundaries. 枝晶多晶成核与晶界溶质阻滞撞击。
The undercooled terrace cools faster than the interstitial runoff can drain. 四个独立的晶核在灰烬层深处各自向外舒展主轴，次级侧枝在未凝固的介质中蔓延，直到它们在相遇线前生生截停。Where the tips clash, solute rejection stalls further solidification, leaving permanent unhealed seams across the plot.
Simulated multi-seed dendritic growth using anisotropic phase-field kinetics with four-fold symmetry. The primary challenge was preventing artificial lattice pinning along the grid axes; seeding off-grid orientations and damping growth at high solute concentrations prevented branches from penetrating each other. 晶界处的溶质富集阻滞（solute impingement）有效维持了晶界清晰度，char distribution remained balanced between the dense core `#` and the diffused boundary `·`.