Terry
When i do what you say, the result volume surface is in the wrong elevation.
Example: my surface "1" is in (+-) elevation 235.600 and my surface "2" starts from 235.850 to 235.450 (it's like a cup), when i do the volume surface, the result goes to elevation 0.0 (+-), and when i do contour elevation 0.0, it gives me the interserction but in the wrong elevation! how do i put this in the right elevation? because what i want is the (surface 1)-(surface 2)
thanks for your time
Ivo Costa
If you don't have a good understanding of how Sites work within Civil 3D, I would recommend that you don't use a featureline, just use the same tool and assign the elevations to the polyline instead. If you want more inforomation on why I recommend this, check out THIS.
Hello Terry
I'm experiencing the same issue and, searching the web, I've found you post
Did you find a solution? I'm still trying to have a "real" difference-surface, that means a third surface that will be the real difference between surface 1 and surface 2 at the right elevation
A sort of bolean operation we usally apply with solids, for instance
Any help?
MIMUMDISTANCEBETWEENSURFACES will create 3D polyline(s) where the two surfaces intersect.
The 3D polyline(s) will be at the shared elevation of the intersecting surfaces.
I think that this is what you are looking for.
The zero (0) contour of a TIN Volume surface, referencing the same two surfaces will trace the same intersection, but at elevation zero (0). This is logical if you consider that a TIN Volume surface represents the elevation difference between two surface. Where the comparison surface is higher than the base surface the value is positive, indicating fill. Where the comparison surface is lower than the base surface the value is negative, indicating cut. Where the surfaces match (intersect) the value is 0.
Conceptually, it may make sense to thin of a TIN volume surface as a TIN Depth or TIN Cut/Fill surface.
Christopher Stevens
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You should probably start a new thread.... Get better response
Rick Jackson
Survey CAD Technician VI
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