How to unite a region of topography that was previously separated from the rest of the surrounding topography? I separated an area of the land where the architectural project will be carried out from the rest of the topography, so that when I change the contours of my terrain, the contours outside the terrain would not change. I happen to want to modify the region of my terrain, and the problem is that I can't merge the region that was previously separated with the rest of the existing topography of the surroundings (I reasoned that I need to merge two regions so that I can redraw the area that will be separated again ). Can someone help me?
Hi, I have this issue as I measure the topography of a site from several stations which results in seperate datasets these then need to be combined. I used to manage this easily with the old merge topography tool.
My current workaround is rather clunky but does work! I have the following workflow (which will also work to rejoin split toposolids)
Voila, only takes a mere few hours!
You can also fill in holes and gaps in a toposurfce like this and add pints in the CSV file to extend the new surface
It's a bit of a pain but quite flexible once you are familiar.
I guess someone with a full version of Revit could write a macro to export the points directly but I only have Revit LT (my turnover is too small to justify the full version which is a shame)
Hello @lu_cas_alves and @architects2
I got a solution that is a bit better, but still not the optimal solution that we all are looking for.
Please do vote on this post regarding merging toposolids. I am surprised that at the time I am writing this, only 15 votes, including mine, are to be seen.
https://forums.autodesk.com/t5/revit-ideas/merge-toposolids/idi-p/12225905
Hi Haider,
This is an interesting solution.
I will definitely try this. It sounds much simpler than my method using Blender!
Peter
Hi @architects2
Thanks a lot for posting your question to the forums! I hope the suggestion by @Haider_of_Sweden works for you. Please let us know if successful.
We look forward to hearing back from you with more information so we can help you as a community!

Jonathan Hand
Industry Community Manager | AEC (Architecture & Building)
Haider_of_Sweden,
When I create the Toposolid from the Imported DWG, all of the points have a z value of 0 - the new Toposolid is flat.
Any idea what I'm doing wrong?
I used to do topography work in just a few minutes with the ground points. I could align with the walls, wouldn't accidentally move the terrain because instead of moving the point, I move the terrain... I could SEE the points I wanted to align with a reference plane... All this in exchange for a "better representation" and digging holes under the ground. Things that I bet not even 5% of users need... Congratulations, they messed up one of Revit's most powerful tools.
@handjonathan Can someone at Autodesk address this issue?
RE: Inability to merge topo solids after they have been split?!? This is a huge oversight. Its the only way to work with topography effectively on slightly larger sites/ more complex sites with more points. Not to mention anything bigger!!!
Secondly, the fact that subdivisions cant exist with a +0.000 elevation is also insane to me. I have seen some forums asking for there to be an ability to go negative in elevation as well which i think is a great idea.
This should definitely be a hotfix at this point. 2 years of no improvement is crazy.
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