[Goptical] Line along optical axis

[Richard Graham]

Hi,

I was wondering if someone could tell me what controls the grey line
which is rendered along the optical axis when rendering the layout of a
system. I can't seem to find any methods to control this. In my case it
is somehow rendered backwards which is annoying. I have attached an
example figure.

Thanks,
--
Richard Graham

layout.svg.gz
Description: GNU Zip compressed data