
Hi Heming,
I suspect you are not using the latest code in the ‘main’ branch of the Chrono repository, correct? Are you maybe using release 8?
Please switch to using the code in ‘main’. There were several additions and fixes in the months since the last release. Among other things, I made several tweaks to that demo to address the issue you are seeing. The demo works fine with the latest code. Having said that, please keep in mind that this is just a demo. For a meaningful simulation of the vehicle on granular terrain, you will need to increase the size of the granular material bed (with corresponding penalty on computational time).
--Radu
Thanks!
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