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Why my car jumps off the ground when it moves from steep road to flat road? (video)

asked 2014-05-18 13:55:21 -0500

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Hi, pos. I'm getting stuck into this issue with my simulation. (video) The problem is: My car jumps off the ground when it moves from steep road to flat road. (though it could move from flat road to steep road easily). Video: http://www.youtube.com/watch?v=Uaq2YWq-uCA&feature=youtu.be If i make it run faster, then it could avoid this issue. (but i need it run at different velocities)

Does setting sdf model of the car matter? or do i need to make to connection segment of road from steep road to flat road less sharp? Could you help me out? So many thanks.

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my initial thought was that the car settles like floating on the ground at the very end of the video. so may be the collision and visual properties are not aligned properly for the final flat road. can you check on that.

peshala gravatar imagepeshala ( 2014-05-18 20:57:56 -0500 )edit

I've check and found that if i set velocity faster by some (e.g: 10 m/s), then it runs okie (with a small jump to pass the connection between steep road and high flat road). Video: http://www.youtube.com/watch?v=kkMG1e6blso&feature=youtu.be My car model is derived from utilitycart model. It is here: https://github.com/tynguyen/mysimulation/blob/master/cartdemoinsert_good.world Is there possibly any other issue?

TyNguyen gravatar imageTyNguyen ( 2014-05-19 07:02:49 -0500 )edit

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answered 2014-05-19 04:37:45 -0500

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Are you using height maps for the road and cylinders for the collisions? The cylinder height map interaction in ODE is buggy (see issue 684).

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You're is totally right. I used heightmap for the road and cylinders for wheel collisions. My world with car model and heightmap is in here : https://github.com/tynguyen/mysimulation/blob/master/cartdemoinsertgood.world Yet, this issue is still open. And i wonder why if i set velocity faster by some (e.g: 10 m/s), then it runs okie (with a small jump). Btw, I'm using Gazebo 2.2. Upgrading to Gazebo 3.0 could help, could'nt it? Or what can i do to solve this problem?

TyNguyen gravatar imageTyNguyen ( 2014-05-19 06:39:32 -0500 )edit
TyNguyen gravatar imageTyNguyen ( 2014-05-19 06:54:45 -0500 )edit

how do you solve the problem??

olmer gravatar imageolmer ( 2014-06-27 09:52:44 -0500 )edit
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Asked: 2014-05-18 13:55:21 -0500

Seen: 645 times

Last updated: May 19 '14