In Revit 2024 through 2026, the new Linked Toposolids functionality produces only an approximate representation of published Civil 3D topography surfaces when datasets exceed 50,000 points. This is a significant regression from previous Revit versions. Using the same Civil 3D dataset, we have compared Revit 2023 Linked Topography (Toposurface) and Revit 2026 Linked Toposolids. Attached imagery clearly demonstrates the geometric discrepancies between the two. The Revit 2023 workflow produced an accurate representation of the source surface, while the current Linked Toposolid implementation does not. Why this is an issue: An approximate terrain surface is not acceptable for infrastructure projects such as: Bridges Marine structures Transport infrastructure The current behaviour introduces design and construction risk, particularly because: Users may not realise the surface is approximate Levels, set‑out, and clearances may be taken from incorrect geometry On Current projects, our teams are being forced to: Abandon Revit topography workflows entirely, reverting to IFC or DWG‑based workflows. This is a regression in coordination, documentation, and productivity. Maintain legacy software versions (Revit 2023) solely to preserve surface accuracy. This is not sustainable long‑term and risks losing AutoDesk support. Impacts: Increased coordination effort between Civil and Revit models Slower documentation workflows (loss of reliable contours, labels, view templates, etc.) Increased risk to design accuracy and downstream construction outcomes Idea to Implement: Removing the 50,000 point limitation on Linked Toposolids Reinstating the Revit 2023 Linked Topography (Toposurface) functionality in later Revit versions.
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