There seems to be a bug in the way range gridlines are drawn in 3D line charts with a CategoryDataset. You'd expect the gridlines to have an angle when they're drawn on the left wall, but instead they're drawn horizontaly. This is visible in the demo:
In 3D bar charts, gridlines are drawn correctly:
The problem seems to be that LineRenderer3D doesn't override drawRangeLine() like BarRenderer3D does. Overriding it would fix to the bug but doing so will create a method almost identical to drawRangeGridlines() (which is the way it is in BarRenderer3D). So I'm wondering if that's the correct way to go and why is it like that in BarRenderer3D.
Also, is this bug going to be fixed in the next version?
Thanks,
Itai