AutoCAD Civil 3D

[#1]

Hello,

I created an enclosed "object" adding break lines to two different surfaces. (Please refer to the attached drawing)

The blue surface shown on the attached drawing is a set of break lines added to "Surface A" and then the red is the other set of break lines added to "Surface B". I have already generated the volume enclosed within the surfaces by doing a surface to surface volume calculation.

My Question:

I want to combine the enclosed volume created by Surface A & Surface B into a 3D "Block" that give me the volume information. Is there a way?

Thank you

[#2]

Really confused by what you mean as a "3D Block that will give volume information"...

Are you now trying to create a 3D solid of the difference...?  If so, what is your end purpose?  How do you intend to use this?

[#3]

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Sinc wrote:

what is your end purpose?  How do you intend to use this?

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I guess he wants to calculate the earthwork, i.e. how much terrain to take away from blue surface to obtain the red one.

[#4]

Create a tin volume surface?

[#5]

If a volume is the key end goal, then yes, a volume surface is the way to go.  You can also use the "Volumes" tool (on the Anayze tab in the Ribbon), but that is not persistent, and you have to redo everything once you close out of that tool.  So creating a Volume Surface is typically more-useful, unless you are "just browsing".

Was just confused by the fact that the OP indicated he had already created a volume surface, and now wanted a "3D Block"...  not sure what that is, or how it would be used.  Or maybe the OP used the "Volumes" tool, instead of creating a Volume Surface...?  That's why I was asking for clarification.

[#6]

Sinc,

I think this is akin to creating a interference object in base/vanilla autocad as a 3D solid.  What the OP might be able to do is to take the 2 surfaces, extract out the contours.   Then use the 3D "Loft" command to create a surface object.  Cut a 3D cube with the plane(s) to create a 3D Solid & then compare/interference check between the two solids to get back to C3D's volume surface in 3 dimensions versus a 2.5D comparison between 2 surfaces (cut/fill at elevation).

But I'm not sure why this would have any advantage over C3D unless you're looking at something like a mining ore body, where there is other (more expensive) software that has features we dont....

[#7]

Ah yes, forgot about that, since I don't do mining surveys.  (This is an area where Carlson is way ahead of Autodesk, although I still think Autodesk is ahead for most users  And Calrson Mining is actually CHEAPER than C3D, BTW...)

[#8]

True - Carlson escaped me - I was thinking of Vulcan, which I heard rumors of $100k/seat....

[#9]

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thepworth wrote:

Cut a 3D cube with the plane(s) to create a 3D Solid

Are you really sure you can trim a solid cube with a "loft" surface, sir..?

[#10]

I had a roundabout way to do it, I think it may have been a "skillbuilder" exercise that I used as a teaching exercise for my 3D Autocad class I taught.  If I can find my source or a .pdf, I"ll gladly post.