I totally feel your pain—tracking down a reliable, maintained IFC query tool that can handle geometric and property filtering (plus JSON output) is way harder than it should be, especially when so many older options are abandoned or incomplete. Based on your requirements (filtering floors by height/shape/structure, path planning later, JSON support), here are the best actively maintained tools to consider:

1. IfcOpenShell (Python/CLI) #

This is my top pick for scripted, automated data extraction. It’s a lightweight, open-source library that’s actively updated, with solid documentation now (a huge improvement over past gaps).

Why it fits your needs: #

• No server required: Run it locally as a Python library or CLI tool.
• Full support for geometric and property filtering: You can directly access IfcBuildingStorey elements, check their elevation (for height), parse their geometric representations to analyze shape/structure, and apply any custom logic you need.
• JSON output is trivial: Use Python’s built-in json module to dump your filtered results directly to a JSON file.
• Great foundation for path planning: Once you’ve extracted floor data, you can easily integrate it with Python-based path planning algorithms (like A*) since you’re already working in a scriptable environment.

Quick example snippet: #

import ifcopenshell
import json

# Load your IFC file
ifc_file = ifcopenshell.open("your_bim_project.ifc")

# Filter floors matching your criteria
filtered_floors = []
for storey in ifc_file.by_type("IfcBuildingStorey"):
    # Example: Filter floors between 3m and 6m elevation
    if hasattr(storey, "Elevation") and 3.0 <= storey.Elevation <= 6.0:
        # Add more checks for shape/structure here (e.g., bounding box dimensions)
        floor_info = {
            "ifc_id": storey.id(),
            "name": storey.Name,
            "elevation": storey.Elevation,
            "description": storey.Description or "No description"
        }
        filtered_floors.append(floor_info)

# Export to JSON
with open("filtered_floors.json", "w") as outfile:
    json.dump(filtered_floors, outfile, indent=4)

2. BlenderBIM Add-on #

If you prefer a visual interface alongside query capabilities, this is an excellent choice. It’s built on top of IfcOpenShell, integrated into Blender (a free 3D tool), and has a very active development community.

Why it fits your needs: #

• GUI-based filtering: You can select floors by property (height, name) or geometric criteria directly in the 3D view, then export the selected elements to JSON via its built-in tools or custom Python scripts.
• Maintained regularly: Updates are frequent, so you won’t run into the stagnation issues you saw with BIMQL or QL4BIM.
• Perfect for educational projects: The visual feedback helps with verifying your filters, and you can use Blender’s geometry tools to analyze floor shapes/structures before extraction.

3. IFC.js (Web-based) #

If your project leans towards web integration or you prefer working with JavaScript, IFC.js is a modern, actively maintained library.

Why it fits your needs: #

• Native JSON support: Since it’s JavaScript, converting query results to JSON is seamless.
• Geometric and property filtering: You can query IfcBuildingStorey elements, access their elevation, and analyze their geometry using built-in functions.
• No heavy server requirements: You can run it locally in a browser or deploy it to a simple web server if needed.
• Good for path planning: You can integrate it with JS-based path planning libraries later if your project is web-focused.

Final Recommendations #

• For automated, scripted extraction (ideal for integrating with path planning algorithms): Go with IfcOpenShell.
• For visual verification and interactive filtering: Choose BlenderBIM.
• For web-based projects: Use IFC.js.

All three options avoid the pitfalls you encountered with older tools—they’re actively maintained, support the comparison operators you need, and don’t require complex server setups (unless you choose to deploy IFC.js).

内容的提问来源于stack exchange，提问作者Mathieu B