Draw on top Maya control node

I wrote a custom locator node for use in my rigs a while back, thought I'd show it off.

As many other have, I'm sure, I read through this post and started playing about with the methods outlined.  It's a great tutorial for anyone looking to get into the python api, so check it out now! Yes, stop reading this and go there if you haven't already,

I took it a little further and wrote a node that could be used as an all purpose controller for rig setups. One of the main pluses of this node is that it can be set to 'draw on top', which is very nice for making aesthetically easy to understand rigs. Credit needs to go to Christopher Lewis also for help on the openGL depth methods for that.

I also wrote in the ability to change the draw shape, rescale the drawn shape, edit transparency and other settings.

I've been using it for a while now and its working great!