It’d would be super useful to be able to set a 3 points as the planar definition for the Ground Plane, possible?
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Hi Sky -
A “ground plane” in Rhino is always horizontal - it sounds like you want something else?
-wim
Yup! In my case - doing automotive work - there is a level for the car that everything is constructed on, but if the car itself has rake when it’s sitting on the ground, a level ground plane does not work. The car level is known and fixed, but in trying different tire sizes and such, the ground plane will move and rotate relative to the car. I can of course just create a planar object, but it won’t work the same as the ground plane, which is very useful.
Wonder if I’m in a similar situation. I’m working on imported objects which I can’t rotate because it causes issues for coworkers who are using a different CAD package, so I need to put the ground plane on a wall, essentially.
I was quite surprised that the currently active CPlane didn’t automatically become a ground plane in the rendered mode. Why is the ground plane hardcoded?
This is @nathanletwory territory I suspect, or is there a hard line between rendered and raytraced mode? 
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Personally I hope the ground plane dies. I know currently there is no way to do a shadow catcher material, but once we have that I hope people will just add a plane themselves. The groundplane is currently a huge geometry object, and that isn’t a good thing.
Most of the time I turn off the ground plane. When I need something to tie a model into a scene only then I add some geometry for the object to anchor on.
So in that respect I’m not the best person to ask 