Hi, I am sorry for stupid question but I have an issue with Harmonic release. I dont know why, but when I use dae file with mesh of some ground model as world base and then I want to spawn a vehicle on the ground (on the mesh, which is not straight as origin plane) the vehicle does not collide with the ground mesh, but it goes through the mesh as soon I start the simulation. It worked in Gazebo classic just fine. But with this release (tried in garden too) it does not work properly… Do And I saw this message in log "Mesh construction from an SDF has not been implemented yet for dartsim. Can anyone, please, help me? just tell me what am I doing wrong… 
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