Undesirable constant height offset for visuals in rviz visualization

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Hi all,

I implemented a rviz plugin based on the rviz display base class. All the rviz shapes in the rviz plugin have a constant height offset.( visuals are floating) I spent a good amount of time to find out the issue but did not succeed yet. I have already checked the applied transforms and position of the parent scene nodes. It all looks fine.

It would be great if anyone could help me understand the problem

Thanks in advance