How to compare 2D drawings and 3D models using Revizto's 2D overlay

Construction projects run on two parallel systems. The 3D model is where coordination happens, where clashes get resolved, and where design intent meets constructability. But 2D drawings remain the backbone of construction documentation. They're what gets issued for construction, what subcontractors reference on-site, what goes into contract sets, and what building authorities require for permits and approvals.

That isn't changing any time soon. 60% of firms are still primarily reliant on 2D drawings or a mix where 2D dominates (22% Fully, 38% Mostly).The challenge isn't that one format is better than the other, it's that comparing 2D construction drawings against a 3D BIM model has always meant switching between environments, mentally mapping what appears on a sheet to what exists in the model, and hoping nothing gets missed in the process.

That gap between drawings and models is where errors hide, where miscommunication starts, and where time gets lost during design reviews, coordination meetings, and field verification.

‍

What is 2D Overlay in Revizto?

2D Overlay is a feature in Revizto that lets you view a 2D sheet directly over a section of a 3D model. Instead of switching between a drawing and a model viewer and trying to reconcile the two, you are able to see how the sheet corresponds with the model in a single view- you can see clearly where the drawing aligns with the model and where it doesn’t.

This makes it possible to visually compare 2D drawings and 3D models without leaving the Revizto environment, giving project teams an immediate, intuitive way to verify that their documentation matches the coordinated design.

Use cases for 2D to 3D comparison in construction

The ability to overlay construction drawings onto a BIM model has practical applications across the project lifecycle. Here are a few examples:

• During design coordination, teams can check whether issued sheets reflect the latest model state. If a partition has moved, a service route has shifted, or a penetration no longer lines up, the overlay makes it visible immediately. This is faster and more reliable than toggling between separate 2D and 3D viewers and trying to spot differences manually.
• For on-site verification, field teams can use the overlay to compare what was issued for construction against the coordinated 3D model. An MEP subcontractor reviewing a services layout can overlay the relevant drawing to confirm routing, clearances, and coordination before work begins. On a tablet, the overlay provides spatial context that a standalone 2D sheet cannot deliver on its own.
• When a vendor does not provide a model, the overlay feature enables their 2D shop drawings to be integrated into the 3D environment, improving coordination with other disciplines by providing visual context where matching 2D views or sections may not be available.

Bridging the gap between 2D and 3D workflows

2D Overlay doesn't ask 2D-focused team members to become 3D users. It meets them where they already work, with the drawings they already reference, and adds the spatial context of the coordinated model on top. For teams that rely on sheet-based workflows but need confidence that their documentation matches the BIM model, it closes the gap without changing how they operate.

To see 2D Overlay in action, book a demo or explore the feature in your next Revizto project.