Axis rendering has odd rings

I am currently using rendering6 binary on ubuntu 20.04.

``` c++
ignition::rendering::AxisVisualPtr axis = scene->CreateAxisVisual(pose_entity.id, pose_entity.unique_name);
axis->SetLocalPose(ignition::math::eigen3::convert(pose));
axis->SetInheritScale(false);
axis->Scale(0.05, 0.05, 0.05);
axis->SetVisible(true);
```


Reproduce the report using the AxisVisual entry point, CreateAxisVisual, with the supplied C++ snippet on Ubuntu 20.04 and rendering6. Compare the rendered axis with the attached image and trace the rendering path for the rings; done means identifying and resolving the cause so the axis renders without the reported rings.

Written by the indexing model from the issue text.