Now that building pads are no longer in Revit 2024 or 2025, I am looking for a way to update Toposolids created from ACAD topo files as the project progresses from concept design to construction documents without losing all of the work I put in with void surfaces and cut forms to make wall and building sections read correctly.
I link the a .dwg file provided by the surveyor as soon as that is available, then when the civil engineer, me as the architect, or the landscape architect need to change the surface topography, I need to update the Toposolid, ideally without losing the void forms or the Cut Forms for the foundation walls and footings that are now part of the new toposolid tools. Since these toposolid tools and the management of them are critical to how building and wall sections read on the sheets, if you have to delete the toposolid that you have spent a lot of time creating with void forms and cutting out footings, it is sad because you have to recreate all of this work. On my projects, the topo change usually needs to occur many times through the design phase including when we are experimenting with various grading options.
Prior to the loss of building pads in Revit 2024, I had a workflow for updating toposurfaces without losing building pads whenever we needed to change the topography contours. This worked for complex projects and large resort projects with many buildings and many pads. I would copy the toposurface and all pads from under the buildings along the x-axis a certain distance (say 3000 ft.), delete the original toposurface and pads, update the .dwg link with the new topo file, create the new toposurface under the buildings, copy the pads back to the new toposurface, then delete the copy. Since pads were not hosted, they could be copied, and this worked great. Also, since the toposurface was just a shell, footings read over the hatch below the toposurface, so you did not have to go around the building to cut footings and walls that drop below void forms for the wall and building sections.
Any ideas? I have been looking at a lot of videos, but nobody has touched on this issue. But I may be missing something simple.
Thanks!
Tom
Sounds like your site planning is typically premature. Personally, I hold off on site planning in Revit until I have something from the Civil Engineers that is pretty much finalized.
Thanks for your comment. Most of my projects are on difficult terrain where I pretty much act as the civil engineer and grading designer in the initial conceptual stages of the project, trying out various architectural massing concepts in Revit from the beginning of the project. My Revit topography comes from a .dwg site survey file where I move around the topo lines (I use spline lines) and am always remaking the revit topo surface. The revit model is linked to Lumion or Twinmotion for rendering and animation to make sure everyone understands the design options. I only design in Revit and hand sketches these days. Once the grading design is set for a project, I export the new topo to a .dwg file that the civil engineer carries on with and that I relink back into the model after they do the road grading which I am bad at.
I don't think Autodesk thought through how architects would work with topo solids without pads. The ability to update the topo ground surface without losing the subgrade voids and cut geometry would be just huge. In the meantime, I could do all of my concept design in Revit 2023 with my beloved pads. Or I could do what I do when subgrade model management becomes too complicated, I turn off the topo in building sections and wall sections and use 2d earth hatches. I am interested in knowing how anyone else handles this issue.
We have been using similar workflow since we began using Revit over a decade ago -- and before Revit, with AutoCAD -- and before AutoCAD, with hand-drafting. We plan our structural foundations and site grading based on the rough grading plans that have been provided by the civil engineers. Horse before the cart, so to speak.
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