| speedThreshold | 子步进算法的速度阈值。 |
| stepsBelowThreshold | 当车辆速度低于 speedThreshold 时，模拟子步骤的数量。 |
| stepsAboveThreshold | 当车辆速度高于 speedThreshold 时，模拟子步骤的数量。 |
配置车辆子步进参数。
每次进行固定更新时，车辆模拟将该固定增量时间拆分为较小的子步骤，并计算每个较小增量的悬架和轮胎力。然后，汇总所有计算得出的力和扭矩，将它们整合到一起并应用于车身。
利用该函数，您可以自定义在高于和低于速度阈值时模拟将执行的子步骤数。
对于每辆汽车，调用该函数一次即可，因为它实际上是向车辆而不是向某个车轮设置参数。
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