ifcpatch.recipes.FixRevit2025TINs

Module Contents

class ifcpatch.recipes.FixRevit2025TINs.Patcher(file: None, logger: logging.Logger, filepath: str, is_solid: bool = True, should_create_edges: bool = True)

Fix missing or spot-coordinate bugged TINs loading in Revit

TINs exported from 12D or Civil 3D may contain dense or highly obtuse triangles. Although these will load in Revit, you will not be able to use Revit’s Spot Coordinate or Spot Elevation tool.

See bug: https://github.com/Autodesk/revit-ifc/issues/511

If is_solid is enabled, we assume the surface is represented as a solid (e.g. I have come across surfaces which are extruded by 1mm from Civil 3D). The solution will delete any faces with a Z normal less than 0.5. In case the mesh has any side faces or thickness, this should leave only the top surface which is relevant for spot coordinates and elevations.

Vertices closer than 10mm will also be merged to prevent dense portions of the TIN at a minor sacrifice of surveying accuracy. It will also triangulate all meshes to prevent non-coplanar surfaces, and delete any obtuse triangles where one of their XY angles is less than 0.3 degrees. Therefore the result will contain some minor “holes” in the TIN, but these holes will only be in dense triangles that Revit can’t handle anyway and won’t affect most coordination tasks.

After that, it will:

  1. Reassign everything to an IfcGeographicElement

  2. Detect boundary edges and create an edge-only IfcVirtualElement.

    Good for clean viz in Revit.

  3. Create a copy of the object which has no sharp faces. This will

    allow Revit’s spot coordinate tool to work on any arbitrary face surface. Note that Revit cannot snap to edges or vertices on this object.

  4. Create a copy of the obejct which has one artifically injected sharp

    face. This trick allows Revit’s spot coordinate tool to snap to edges and points. However, Revit cannot sample an arbitrary surface. By combining this object with the previous object, you get the best of both worlds.

If you’re thinking that this overlapping, Z-fighting, duplication of objects with arbitrary almost-degenerate triangles being added is a horrific abomination in the world of software workarounds, you are absolutely correct.

This is a variation of FixRevitTINs which has been tested on Revit <= 2023. I’ve tested this one on Revit 2025 (the behaviour has changed).

Note that you may may want to run other tools like OffsetObjectPlacements or ResetAbsoluteCoordinates to fix large coordinates as these can also cause issues in Revit (such as inaccuracy or inability to use the Spot Coordinate / Elevation tool).

This patch is designed to work on any TIN-like export, typically coming from civil software. It also requires you to run it using Blender, as the geometric modification uses the Blender geometry engine.

filepath argument is required for this recipe, file argument is ignored.

Parameters:

  • filepath – The filepath of the IFC model. This is required to load into Bonsai.

  • is_solid – If true, assume a thickness and delete anything that isn’t the top face.

  • should_create_edges – If true, a new IfcVirtualElement is created representing the perimeter of the objects. This allows you to to hide regular surface edges in Revit and only use the perimeter edge for visualisation.

Filter_glob filepath:

.ifc;.ifczip;*.ifcxml

Example:

ifcpatch.execute({"input": "input.ifc", "recipe": "FixRevit2025TINs", "arguments": []})
convert_si_to_unit(co)
create_cartesian_point(x: float, y: float, z: float | None = None, is_model_coords: bool = True) → ifcopenshell.entity_instance

Create IfcCartesianPoint.

x, y, z coords are provided in SI units.

create_cartesian_point_list_from_vertices(vertices) → ifcopenshell.entity_instance
create_curves_from_curve(is_2d: bool = False, curve_object_data=None) → list[ifcopenshell.entity_instance]
create_curves_from_curve_ifc2x3(is_2d: bool = False, curve_object_data=None) → list[ifcopenshell.entity_instance]
create_curves_from_mesh(geom_data) → list[ifcopenshell.entity_instance]
create_curves_from_mesh_ifc2x3(geom_data) → list[ifcopenshell.entity_instance]
create_edge_sampleable_object(obj)
create_edges(obj)
create_face_sampleable_object(obj)
patch() → None
file
filepath
is_solid = True
logger
should_create_edges = True