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Optimising Your BIM Models Exports for Carbon Assessments in ORIS: Tool-Specific Tips

This guide provides practical, tool-specific tips for Autodesk Revit, Autodesk Civil 3D and Bentley Systems (MicroStation / OpenRoads) to streamline your workflow and reduce manual mapping effort.


The accuracy of carbon assessments in ORIS open BIM Module depends entirely on the quality of your BIM data. While general principles of categorisation, quantity consistency, and material metadata apply universally, each authoring tool may require additional specific preparation to ensure ORIS reads geometry and properties correctly.

Autodesk Revit

Autodesk Civil 3D

Bentley Systems (MicroStations /OpenRoads)

Autodesk Revit

Revit models are often rich in detail, which can include legacy or non-essential information that slows processing and complicates carbon extraction.

Best Practices

  • Remove Links: Deactivate or remove non-essential DWG links to reduce file size and improve processing speed.
  • Purge Irrelevant Data: Delete elements not contributing to the carbon assessment, such as furniture, interior finishes, or temporary construction elements.
  • Split Disciplines: Instead of uploading a federated model, manage Civil and structural disciplines separately. This prevents excessive file weight and makes quantity mapping more efficient.

Tip: Use Revit’s property sets consistently across all elements to ensure ORIS can categorise and map materials automatically.

Autodesk Civil 3D

Civil 3D models, especially those containing complex corridors, can produce thousands of fragmented lines or “noise” during extraction if not prepared properly.

Best Practices:

  • Manage Corridors: Extract corridor solids cleanly to avoid geometry errors and ensure volumes are readable by ORIS.
  • Simplify Corridor Geometry: Remove unnecessary subassemblies, bodies or temporary construction lines before uploading.
  • Filter by Codename: Apply filters in the 3D model to group elements logically (e.g., corridor sections, pavement layers) and reduce unnecessary lines. Typically, the Codename is a property that supports this categorisation or grouping of elements. 

Tip: Consistent naming conventions and property sets are crucial; even with clean geometry, inconsistent material or quantity properties can create multiple rows for the same element in ORIS.

Bentley Systems (MicroStation / OpenRoads)

Models in Bentley environments often use parametric elements, such as Smart Solids and Smart Linears. These rely on internal engines for their geometry and do not generate explicit 3D shapes by default, which can cause the model to appear empty when uploaded to ORIS.

Best Practices

  • Corridors: Ensure corridors are fully generated and baked so their volumes can be extracted reliably.

Tip: Always validate the baked geometry in a viewer before uploading to ORIS to avoid missing elements in your carbon assessment.