Hello Everyone!
I have some duct work, which looks like this with the Visual Style set to Hidden Lines.
What i would like to see:
- Ducts has center lines
- Dashed lines at crossing
Final question: Why is the duct at the right side still in wireframe mode?
Hi @Anonymous,
Hope you are well! 
I created a Screencast for you which pretty much shows what you are dealing with and which answers all of your questions and which shows you how to assign center lines to your round ducting and fittings. Also, how and where you can set your hidden lines (various options) and how your view discipline settings effect what you see.
I think, by looking at your image, your working on the coordination view discipline, your hidden lines won't display, unless if you follow a couple of things which I did. You also need to work on your mechanical view discipline to have better control over your hidden and center lines. Your round ducting to the right has an element or filter transparency override associated to it, you can simply clear the overrides.
Thanks for your Screencast! I was already through all of those things, you showed me in that video. In my case the solution was way easier. "Show Hidden Lines" setting in the Family Template settings was turned off.
Hi @Anonymous,
I'm glad that it helped! 
I essentially go through what resolved your "hidden line" issue @04:05 in the Screencast. Your setting was driven by the View Template which is essentially the same thing that I showed as your company View Template settings control Property Pallet and View Control Bar UI settings which I went through.
