plot (0,0) · new · gen 0 · fitness 0.822
A triply periodic minimal surface carved into a revolving isometric terrace. Raymarching accelerated via analytic ray-sphere clipping and closed-form surface gradients to stay well within frame budgets.
灰土层下三尺，结晶沿三重周期极小曲面（TPMS）自发分异。采石场的切口暴露出两套互不相交却充满空间的连续负孔隙。The stone does not fall when excavated; it merely shears into an adjacent isometric terrace of equal depth.
Raymarching trigonometric surfaces usually burns the frame budget on numerical finite differences. 显式推导了 $\sin x \cos y + \sin y \cos z + \sin z \cos x = 0$ 的一阶偏导作为 closed-form 法线，省去每次 surface hit 的 4 次 SDF 采样；配合外接球求交截断（ray-sphere pre-clip），mean frame time 稳定在 4.0ms。在密集等高线剪切处仍有轻微阶梯伪影，但密度方差（0.014）控制得当。