Help with rigid terrain's mesh height

[Tong Xu]

Hello,

I compiled chrono version 9.0.1 from source code on Ubuntu22.04. Now, I have built uneven rigid and deformable terrain by concatenating different patches. In my code, after setting the terrain, I want to set the height for vehicle position from rendered uneven mesh in pychrono before while True main loop. I use terrain.GetHeight(chrono_pos), it always returns 0. However, after vehicle moving in the while True main loop, I can get real height successfully. Deformable terrain always works. Any one know the reasons? Thanks a lot!