Creating a Surface as the Difference between 2 Surfaces

[wings1080]

Hi!

I need to create a surface that is the elevation difference between 2 surfaces, i.e. at a particular x,y location if the elevation of surface A is 47' amd the elevation of surface B is 42', the new surface will be 5' at that location.

Is this possible?  And if so, please explain how?

THANK YOU VERY MUCH!

[Citadel2012]

Go to the prospector and right-click surfaces, create a new surface. Under the "type" in the upper left hand corner of the pop-up should be an option to create a "TIN volume surface." The window will then prompt you to enter a base and comparison surface.

[wings1080]

YES! then i assume this will be another surface with a new name that I could run a surface area 2d table on?

[Citadel2012]

Yes, this would be a completely new surface. The spot elevations of this surface would give you the vertical cut/fill at any given location. 

[neilyj666]

and you can do a surface analysis showing colour coded cut and fill as well as showing cut spot levels in red and fill in green.

[wings1080]

awesome thanks!!

[wings1080]

neilyj, that would be great, could you explain how to do that please?

[neilyj666]

Won't be back in front of civil til Monday so will post then unless some one else chimes in before.

In the meantime try goggling "cut and fill exhibits". In 2014 you can also have a transparency for the cut fill drawing to show the detail below. This may be possible in earlier versions but it was broken in 2013.

[wings1080]

same here neilyj, no civil 3d till Monday morning, I will hunt you down then 🙂 will try some googling too, I have 2012 by the way, thanks for your help so far 😉

[wings1080]

top o the morning neilyj, i am googling what you said but if it's easy enough for you to explain this please do! appreciate it!