Hello.
I found the reason for this problem. excuse me. I will close this
problem.
在2022年11月9日星期三 UTC+8 17:56:58<ji li> 写道：
> Hello,
> When I use the FlatTerrain with 0 height on Sedan, The height of
> the Serdan keeps decreasing over time. What is the reason? The car of
> Sedan configuration is as follows:
> init_pose: ChVector<> initLoc(0, 0, 0.2) ChQuaternion<>
> initRot(1, 0, 0, 0)
> step_size: 0.002 s
> tire_step_size: 0.01
> CollisionType chassis_collision_type = CollisionType::NONE
> TireModelType tire_model = TireModelType::TMEASY
> ChContactMethod contact_method = ChContactMethod::SMC
> Sedan::GetSystem()::SetSolverTolerance(0.01)
>
> The result at time 0.002 (height 0.199961) and 0.178 (0.0428526)as follows
> [image: 20221109-175241.png]
> [image: 20221109-175300.png]
>
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