Table Top vs Surface

[Richard Ingraham]

What is the difference between a Table Top and a Surface?  As far as I can tell from a 3D view perspective, they behave the same. 

[David]

In the 3D viewer, with no table top available, AnyRail uses the work area as 'Ground'. If you have one or more table tops, these will become the ground.

In 2D, elements stick to the table top they are on. If you shift or rotate the table top, the elements on it will move with it.

[Richard Ingraham]

So what are surfaces then?  Sorry I'm still confused as to why you use one over the other.  I also really wish I could have table tops at multiple heights, and then when you go to the 3D view, track or other objects like rectangles and circles and such would only extend do to the table top that is just below them.  That would allow for better handling of multiple level layouts.  Right now I sort of have to make any track on a 2nd level a bridge, so all the track below it isn't hidden in some weird gully below.

[David]

A surface is just a flat area. The table top area will be used to create heights in the 3D view.

Elements will stick to the table top they overlap with. If there are more (this implies that you have overlapping table tops), they will stick to the one that is vertically nearest.

[Richard Ingraham]

A surface is just a flat area. The table top area will be used to create heights in the 3D view.

Elements will stick to the table top they overlap with. If there are more (this implies that you have overlapping table tops), they will stick to the one that is vertically nearest.

Thank you for the help.  I have some experimenting to do I guess.   (a good thing, not a complaint)