该 WheelCollider 支撑的质量。
车辆模拟使用簧载质量模型 - 它将所有车轮支撑的汽车的全部质量一次分解为由每个车轮支撑的一组簧载质量。然后，计算每个车轮-质量对的所有悬架和轮胎力，最后整合施加到车身的所有力。在最简单的情况下，对于具有四个车轮的完全对称的车辆，所有簧载质量将等于汽车质量的四分之一。该属性根据车辆配置自动进行计算。
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