Merge two surface with conditions

[aniket.bhola]

Hello everyone,

I have natural/ existing terrain model in Civil3d. I have center line on which I have plotted proposed profile and existing profile.  I am attaching sample images for Cut fill plan and some cross sections.

In image CS1 fill area shown with green color hatch. there are flat proposed profile(red color) running across transverse direction along the center line. existing profile is also there (Dark gray color).

I wants to generate new surface with

condition (1) - proposed surface levels maintained as per proposed profile for cut area ; shown in attached plan1 (Cut area shown as light red color and fill area shown as light green color).

condition (2) - existing surface levels should be maintained as per existing surface where fill area (green color hatch) is there in plan.

In Plan3 etc. Red line is center line, Light red color hatch is cut area, light green color hatch is fill area, 

In CS1, CS2 etc .. vertical line shown is center line, Light red color hatch is cut area, light green color hatch is fill area & yellow color hatch is natural earth beneath all profiles.

In cross sections there may be multiple conditions like possibilities of fill area may be far away from center line, then cut area and then again fill area in cross section. (can be seen in PLAN3 Image).

All cross sections are at different locations which is perpendicular to the center line.

New surface model should have levels of proposed surface  where light red is there in PLAN3 image and existing surface where light green is shown in PLAN3. My cross sections is not limiting only as shown in CS1 width; there are multiple slope and other assembly conditions.

I have tried to create new surface then pasted existing and proposed surface with data operation priorates of two surfaces but not getting desired result.

If any solution other than pasting surfaces to the new one then let me know.

Thank you.

-Aniket

[rl_jackson]

I don't believe that is possible, it's an all or nothing situation you hold the proposed surface, or you don't. It pretty sure it can't be constructed in the manner you're requesting.

[neilyj666]

If I'm interpreting your question correctly, the only possible way is to identify the various areas using MINIMUMDISTANCEBETWEENSURFACES and trying to piece together multiple smaller surfaces. I have tried this on a few projects and it is painful to attempt.

It wouldn't be beyond the Autodesk boffin's capability to programmatically achieve this but they don't seem interested in providing useful tools to get the job done.

[ChrisRS]

I do not fully understand what you are trying to accomplish. I agree with @neilyj666 in Message 3.

MINIMUMDISTACEBETWEENSURFACES will let you generate polylines that can be used as surface boundaries. 

[aniket.bhola · Accepted solution]

I agree with this solution up to certain extent; can be helpful for manually updates;  but I am working with more than 40 km of length of terrains and proposed level profile at center line also changes as per project progress (so the generated boundaries also get changed & reflected in changes in cut-fill area).

It would be great if by any method we can have dynamically linked cut - fill area boundaries.

Thanks for valuable inputs on my question.

[neilyj666]

I'd suggest that you break up the 40km length into smaller (10km) lengths as Civil 3D performance can degrade severely with larger models. Unfortunately there is no dynamic method and if the  profile changed during the design iterations the method for extracting the boundaries that I have suggested would not be dynamic.

You can always add your request to the Ideas station as it has merit but i wouldn't be holding my breath for a resolution from Autodesk.