in reply to Adding text to PDL's TriD 3d graphs

Note from THE FUTURE: now (in 2022) there is a PDL::Graphics::TriD::Labels, visible in use in the demo 3d, code at https://github.com/PDLPorters/pdl/blob/1349803ea2aa67e7c854b1249338303b0e0ec351/Demos/TriD1.pm#L189-L223.

In Section Cool Uses for Perl