3D Objects in a Canvas - what is best practice?

Post title is pretty self-explanatory, but - I can't find a definitive answer on this via searching the forums etc.

Can someone with experience weigh in? Is there a way to do it without scaling 3D objects by gigantic factors, for example (as the typical case is with say, a 3D object that is a child of a canvas)...

Should I simply write my own solution, or does Unity have support this properly out of the box (so to speak), and have I missed something painfully obvious?

 

Nobody?

 

Example:

I have a 3D scene, with a 2D UI - 2D UI is on its own layer & canvas, and as its own (depth) camera. Works fine.

If I add a 3D object to that canvas (set to overlay), it doesn't render. I need to scale it up by say, x1000 for it to be of a viable size - but it's not a scale issue. It just doesn't render.

So, if I change the canvas render mode from Overlay to Screen Space Camera, the UI disappears, until I push the camera depth up a bit. Now I can get a 3D object to render, however it needs to be scaled up to even crazier values, and that frankly unnerves me - this feels like it should be supported via base UI functionality, so I'm other missing something - or Unity doesn't support 3D objects in its native UI system without a series of weird steps and hacks.

Is it the former, or the latter?

 

*tumbleweeds*

 

May be this would help