Difference Engine
This repository hosts a tool for calculating differences between BIM models as part of the AECTech 2022 Hackathon. Written in 180 lines of C# using .NET 6.0 and VIM API.
The Grasshopper scripts for loading visualizing the changes in 3D and as 2D graphs in Rhino, along with the web-app for hosting the visualization can be found at
https://github.com/sophXmoore1/compute.rhino3d.appserver-1.
Presentation
You can download the presentation as pdf or view it online.
How it works
The difference engine generates JSON files containing change records and OBJ files representing the geometry which was added, removed, changed, resized, or moved.
Grasshopper was used to load the deltas and geometry into Rhino, to display the geometry in 3D, to summarize and plot graphs in 2D, and to navigate through the deltas in time.
A tool call the Rhino Compute Appserver was modified and used to host Rhino and serve the data and visualizations over the web.
Performance
We were able to process 10 VIM files (total 100MB), originating from 10 Revit files (total 300MB) in 5 seconds, to produce the OBJ and JSON files representing the deltas (change sets).
Team
Difference Engine team:
- Augustina Aboy
- Ben Ferrer
- Christopher Diggins
- Matt Shelp
- Nick Bowker
- Nick Mundell
- Sophie Moore
Requirements
- Revit to VIM Exporter Plug-in Get it for free here
- VIM SDK Contact us to get a copy