Java 版鞘翅 tick 公式

lookH = cos(pitch)
lift = cos(pitch)^2 * min(1, |look| / 0.4)

vy += -0.08 + lift * 0.06

if (vy < 0) {
  yAccel = vy * -0.1 * lift
  vy += yAccel
  vx += yAccel
}

if (pitch < 0) {
  climb = |vx_old| * -sin(pitch) * 0.04
  vy += climb * 3.2
  vx -= climb
}

vx += (|vx_old| - vx) * 0.1
vx *= 0.9900000095367432
vy *= 0.9800000190734863

二维化固定 yaw，只保留水平轴和垂直轴；pitch 仍采用 Minecraft 约定：负值抬头，正值低头。

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