defaultSolverVelocityIterations 影响物理关节和碰撞接触的精确度（默认为 1）。必须为正。
增大此值将提高物理弹跳后产生的退出速度的准确度。如果您遇到关节物理或布娃娃在碰撞后移动过大，可以尝试增加此值。
通常在 编辑->项目设置->物理 检视器中更改此值，而不是通过脚本更改。
提示：更改 defaultSolverVelocityIterations 不会影响已创建的物理。若要更改现有物理，请使用 Rigidbody.solverVelocityIterations。
其他资源：Physics.defaultSolverIterations。
using UnityEngine;
public class Example : MonoBehaviour { void Start() { Physics.defaultSolverVelocityIterations = 10; } }
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