Automated Geometric Comparison Tool for Phasing and "As-Built" Generation

[a_arregui]

Hello everyone, 
The feature of Phasing in Revit needs to be rethought:
The proper automation of model-comparisons would bring a big added value to the program. 
Thanks in advance for voting for this necessary improvement.

The Challenge

Currently, creating accurate "As-built" drawings in Revit requires a manual, labor-intensive process. When a project undergoes significant field changes, users must manually split elements, assign phases, and manage visibility settings. In fast-paced environments, this workflow is inefficient and prone to error, especially when comparing a "Design Intent" model against a "Field Survey/Contractor" model.

The Problem

Revit lacks a native way to compare two versions of a model (or two separate linked files) and automatically categorize the geometric differences into Phasing.

• Manual Slicing: To show part of a wall as "Existing" and another part as "Demolished," we must manually use the Split tool.

• Lack of Delta Analysis: There is no "Compare Models" feature that identifies overlapping volumes vs. new volumes between two RVT files or Design Options.

Suggested Solution: Automated Phase Mapping & Intersect

I am proposing a feature that allows Revit to intersect two models (or a Link vs. a Live Model) to identify geometric deltas.

1. Volume Comparison: An automated tool that identifies where Geometry A (Original) and Geometry B (As-Built) differ.

2. Automated "Part" Generation: The ability for Revit to automatically slice elements based on the intersection of the two models.

3. Visual Delta Reports: A view mode that highlights "Added," "Removed," and "Modified" geometry (similar to how Navisworks or BIM 360 handles versioning, but directly editable in Revit).

Use Case

During the construction of a hospital, the MEP and partitions are shifted 200mm in the field. Instead of manual splitting and re-phasing, the architect links the Contractor’s model and runs a "Phase Comparison." Revit identifies the shifts and creates the necessary "Demolished" and "New" graphics automatically based on the volume overlap.

[mhiserZFHXS]

How in the world is modeling two entirely different models and then having Revit figure out the differences faster than just building a single model and making the changes yourself? That seems, far, far more prone to errors and redundant work. 

[a_arregui]

Hi @mhiserZFHXS , I understand your confusion. 

The current workflow for Revit requires a very tedious slicing of elements, placing them in different phases, etc. 
When confronted with the reality, offices work with several options, in order to find the best solution for every design topic. The proposed workflow is out of question, since the architects or planers would spend more time in management, than in the actual thinking/design process.

Our request focuses on two states/phases of the same model. A starting model, and a model where there have been several changes over the time of 1 to 2 years. 
An automated comparison between these two models and a successful creation of plans should be available. This would add a big value to Revit, and would solve this tedious process, which architects face one to two times per project, saving weeks of unnecessary 2D work.