Cesium for Omniverse v0.25.0

Cesium for Unity Samples v1.18.1

CesiumJS 1.134

Architecture, Engineering, and Construction (AEC)

Large scale projects require massive coordinated efforts from many people across many businesses, whether that’s grading hundreds of acres for new suburbs, laying thousands of miles of pipelines, or hauling tens of thousands of cubic yards of dirt from quarries. Even minor errors can be costly, and sharing a common ground between the many teams involved is critical.  

Propeller supports users working at large scale sites: quarries, mines, earthworks, waste management, etc. Courtesy Propeller.

For users like these, Propeller provides the tools to perform frequent accurate drone surveys, process that data, and visualize the site. When this isn’t frequent enough, DirtMate brings near-real-time data into the mix. Propeller’s platform gives users an intuitive 3D model that’s recent, realistic, and accurate, so they can spot safety hazards, track earthworks progress, and measure reality against design plans to make calculated operational decisions around material, labor, and equipment needs. 

Propeller’s users perform drone scans of their sites and then visualize those scans in 3D with CesiumJS. Now, with support for IFC files as 3D Tiles, they’re able to compare designs against reality. Courtesy Propeller.

The heart of Propeller’s visualization is CesiumJS. Propeller was an early adopter of Cesium: for years they’ve been using Cesium’s open source software to visualize drone-captured surveys of earthworks, quarries, mines, and waste management sites. Propeller’s commitment to accuracy—reliably achieving geospatial accuracy within 3 cm—has made their platform trusted by professional surveyors. The sophisticated tooling they’ve brought into their platform, which they put into a simple form factor, makes advanced analysis accessible to anyone involved in the project, regardless of technical background.

Propeller users can see their project in accurate 3D. For pipelines, electric utilities, railways, and other long linear assets, the geospatial coordinate system in CesiumJS renders designs aligned with real-world curvature. Courtesy Propeller.

Propeller recently got an upgrade when its team incorporated Cesium’s Design Tiler into the platform. The Design Tiler takes complex BIM data, like the Industry Foundation Classes (IFC) open standard, and tiles it into 3D Tiles for efficient streaming. These improvements allow users to look at much more granular data, on a much larger scale, faster than ever.

"Integrating the Cesium Design Tiler into our platform has revolutionized our support for BIM for all our customers.” 

—Harry Morris, software engineer, Propeller

3D Tiles has made IFC files from one of the most cumbersome to one of the most performant file types on Propeller’s platform. This video shows first the original solution of an IFC model loaded in Propeller’s platform and then the same model tiled as 3D Tiles. Courtesy Propeller.

A visual of IFC files loaded in Propeller's platform before 3D Tiles and after tiling.

IFC files in Propeller before and after 3D Tiles

The tiling pipeline transformed IFC files—once cumbersome and limited to 300 MB—into one of the most performant file types on Propeller’s platform, which now supports IFC files up to 2 GB. This 6–7x increase in file size capacity came with dramatic performance gains. 

“For our customers with the most demanding projects, framerates are up anywhere from 20% to 170%, and memory usage has been drastically reduced, with our most demanding models seeing a 60x reduction in memory usage and similar reductions in data transfer," said Harry Morris, Propeller software engineer.

When streamed as 3D Tiles, IFC files retain all metadata: an inspector can click on an individual bolt in a bridge and see its size, manufacturer, the contractor responsible for installing it—whatever the users have uploaded. Courtesy Propeller.

Bringing Cesium’s Design Tiler into the platform took the Propeller team less than two months to roll out to full production deployment. When they released the new feature, the team also retroactively tiled all previously uploaded IFC files, delivering immediate value to their users without requiring re-uploads or workflow changes:

"Integrating the Cesium Design Tiler into our platform has revolutionized our support for BIM for all our customers. Cesium's expertise in the 3D Tiles open standard has delivered us a solution with greatly improved performance, accuracy, and feature richness—we've delivered highly requested features and given our construction customers confidence in an easy-to-use pipeline, revolutionizing their workflows," Morris said.

For Propeller’s users, streaming IFC files as 3D Tiles means a faster, higher quality experience. They can analyze large files, like viewing cross sections of this IFC model. Courtesy Propeller.

Explore how you can use 3D Tiles to make your datasets more accessible with Cesium’s 3D tiling pipelines.  

Propeller Streaming Complex IFC Files for Construction with 3D Tiles 

"The most brilliant engineering designs, no matter how well crafted, remain unrealized until their vision can be clearly communicated and understood by all stakeholders," said Wayne Sullivan, visualization lead at infrastructure engineering and consulting firm Parametrix. This philosophy drives Parametrix’s Advanced Visualization team: a group of software engineers and 3D artists using Cesium for Unreal, Cesium ion, and Google Photorealistic 3D Tiles to enhance public outreach and help win project bids by making complex designs easier to understand.

High-fidelity, photorealistic renderings of a proposed design helped the City of Las Vegas secure a $25 million grant for the Stewart Avenue Complete Streets project. Courtesy Parametrix.

Founded in Sumner, Washington, in 1969, Parametrix has expanded its services and geographic footprint across the United States. Today, the company provides multidisciplinary services in transportation, water resources, environmental planning, and community building, consistently ranking among top design firms in the regions they serve. In 2020, Parametrix acquired Civil FX, a startup that Sullivan helped build, specializing in interactive visualizations of transportation projects. 

Sullivan's Advanced Visualization team has become an integral part of Parametrix. The team's work supports projects across the company, dedicating 75% of their time to visualizing designs for community engagement and 25% to supporting grant and RFP proposals to win new business. Their workflow involves directly importing 3D models, created in applications such as Civil 3D, MicroStation, OpenBridge Modeler, or Revit, into Unreal Engine. The team uses Cesium for Unreal to precisely place these 3D models onto a WGS84 globe. With Cesium ion, they stream Photorealistic 3D Tiles into Unreal Engine to provide rich geospatial context and boost project realism, so stakeholders get a clear picture of changes coming to the communities they care about.

Built on open standards and APIs, Cesium for Unreal combines the 3D geospatial capability of Cesium with the high-fidelity rendering power of Unreal Engine, making smooth rendering and simulation available across industries. Photorealistic 3D Tiles are built on 3D Tiles, the Open Geospatial Consortium (OGC) community standard created by Cesium, to efficiently stream massive amounts of 3D data.  

Sullivan and his team began using Cesium in 2023 after learning about it on Reddit and LinkedIn. Today, Sullivan estimates that Cesium for Unreal and Photorealistic 3D Tiles cut about 30% of their team’s project time. “We use that extra time to build better experiences,” said Sullivan. 

Parametrix played a crucial role in helping the City of Las Vegas secure a $25 million federal grant to transform a 4.5-mile section of Stewart Avenue. This corridor is a vital route, with more than 35% of all users being pedestrians and cyclists. The City of Las Vegas identified that fragmented sidewalks and a critical lack of shade contribute to an unsafe and uninviting environment for pedestrians and other roadway users, as detailed in their Stewart Avenue Complete Streets Project Fact Sheet. 

“This is such an important project to the city and to the community in general,” Nicole Melton, the city engineering project manager, told KLAS news. “And when we do these public works projects that revitalize areas, we can spur economic development.” 

VR headsets were used to immerse the public in proposed designs during outreach efforts for the Stewart Avenue Complete Streets project. Courtesy Parametrix.

"Our visualization work was instrumental in communicating the project's vision to help secure its funding, and now we are excited to be involved with its implementation," explained Sullivan. The project is currently in its early design and planning phases, with construction anticipated to begin in 2027. Parametrix continues to leverage Cesium for Unreal and Photorealistic 3D Tiles in their work to gather public feedback. At a recent public meeting, Parametrix streamed the project concept to VR headsets, so attendees could immerse themselves in the proposed design.  

Parametrix’s visualization team extended Cesium’s open-source platform to showcase various aesthetic treatments for the Keystone Bridge project in Reno, Nevada. Courtesy Parametrix.

Parametrix: Keystone Bridge Material Switcher

Parametrix also used Cesium for Unreal and Photorealistic 3D Tiles on the Keystone Bridge project in Reno, Nevada, for the Regional Transportation Commission of Washoe. The project required showcasing aesthetic treatments for the bridge. Instead of creating static images to show treatment options, Parametrix developed a dynamic tool on top of Cesium for Unreal, leveraging its open-source foundation. This tool enables instant swapping of different colors of concrete as well as girder and rail colors and types, allowing project stakeholders to examine numerous aesthetic combinations. This interactive approach improves the efficiency of the stakeholder decision-making process, with the detailed model integrating with Photorealistic 3D Tiles for real-world context. 

“In the past, we’d have to render so many different aesthetic combinations on a project like this,” Sullivan said. “This tool saves us a lot of rendering time.” 

Parametrix’s Advanced Visualization team is committed to pushing the boundaries of project visualization. Their sights are set on leveraging Cesium ion for Gaussian splats production, a feature introduced at the 2025 Cesium Developer Conference. “Post-processing and cleaning up traditional photogrammetry can be time consuming,” explained 3D designer Justin Gould. “I’m looking forward to experimenting with Gaussian splats in Cesium to speed that up and using that data to inform custom geometries,” added Gould. 

Get started with a free Cesium ion account to pair your 3D models with accurate geospatial context. 

Parametrix Engages Communities and Wins Bids with Cesium

When it comes to infrastructure investments, visualization transforms public engagement from abstract discussions to concrete decision-making. HNTB’s Immersive Media Solutions team uses Cesium ion, Cesium for Unreal, Cesium for Unity, and Google Photorealistic 3D Tiles to help community stakeholders better understand proposed infrastructure projects and engage meaningfully in the approval process. 

A flythrough of a proposed design to replace the Bourne Bridge was used in public outreach efforts as part of the Cape Cod Bridges Program. Courtesy HNTB. 

HNTB: Bourne Bridge

Founded in Kansas City, Missouri, in 1914, HNTB initially focused on designing railroad bridges. Today, the company offers comprehensive services in engineering, architecture, planning, and construction management, primarily focusing on transportation infrastructure. Their architectural services extend to designing and managing projects for public assembly facilities, including numerous prominent sports stadiums and arenas.  

“When presenting an infrastructure project proposal for public engagement, it’s crucial that local stakeholders and property owners understand where their property, building, or favorite park is located in relation to the proposal, and that the surrounding context is recognizable,” HNTB immersive media solutions manager Dave Willard said. 

Willard and his team create real-time interactive media to visualize and assess infrastructure project designs, from single highway interchanges to 30-mile road and rail corridors. They load a diverse range of 3D engineering and design models of roads, bridges, or rail networks—created in applications like OpenRoads, Revit, MicroStation, Civil3D, or SketchUp—directly into Unreal Engine or Unity. The team uses the Cesium for Unreal or Cesium for Unity plugins, depending on the project, and accesses Photorealistic 3D Tiles via Cesium ion to add real-world context, enriching project visualizations for public review and community engagement initiatives.  

Designed to deliver highly detailed and realistic data for immersive environments, Google Maps Platform's Photorealistic 3D Tiles enable immersive experiences that scale from individual buildings to entire cities. Photorealistic 3D Tiles leverage the Open Geospatial Consortium (OGC) community standard 3D Tiles format, created by Cesium, which performantly streams massive amounts of 3D geospatial data. 

Prior to adopting Cesium, providing accurate geospatial context for major projects was a significant time investment, requiring the team to manually model, texture, and detail existing buildings.   

“Now, we bring that data in from Cesium and use it as-is in many cases,” Willard explained. “It removes the headache on our end, allowing us to focus our time on visualizing the proposed project instead of the buildings that are already there.”   

HNTB's visualization team extended Cesium's open-source platform to vertically align long linear infrastructure models with the Earth's curvature. Courtesy HNTB.

This capability proved invaluable to HNTB during its work on a long highway corridor project in the southeastern United States. 

“Manually modeling existing buildings for contextual detail on long linear projects historically required over 1,000 hours of work,” Willard said. “Cesium reduces that time to between 200 and 300 hours." 

The extensibility and open-source foundation of Cesium enabled HNTB's visualization team to build a tool that addressed the challenge they faced in accurately aligning this 26-mile corridor model. Traditional engineering designs don't account for the Earth's curvature, leading to noticeable vertical discrepancies over long distances—in this case, the model floated about 80 feet above the earth at one end and dipped 80 below the other. 

HNTB developed a non-destructive mesh blending tool on top of Cesium that could automatically apply the necessary curvature to large, complex 3D models. This allowed them to continuously update design models in their Unity environment, with the tool automatically correcting for Earth's curvature, ensuring "ground truth accuracy" for their clients.  

“One of the really cool things about having Cesium is the ability to build other tools on top of it,” remarked Adam Liss, HNTB senior immersive media specialist. 

Willard's team, serving as a key consultant for the Massachusetts Department of Transportation on the Cape Cod Bridges Program, was tasked with presenting 10 different interchange configurations for public review. 

Traditionally, this would have necessitated creating numerous individual videos and renderings for each combination, making it difficult for the public to compare scenarios and provide feedback. Instead, Willard's team applied their Cesium-powered interactive media capabilities, so presenters were able to dynamically display and toggle between these different interchange options, with detailed surroundings the reviewers expected to see, in real time via pixel streams and locally-run applications during public meetings. 

HNTB’s team also built masking tools using Cesium. These tools enable them to overlay potential designs directly onto existing structures, making it easy for viewers to compare the past with the proposed future.

For a bridge proposal to link barrier islands along the Gulf Coast of Texas, HNTB integrated Cesium’s World Bathymetry data into their visualization. This addition helped stakeholders understand how underwater topography and the locations of historic shipwrecks impacted the busy shipping lanes beneath the proposed bridge design. “It’s important to be able to render this 2D-type information in a 3D context,” Liss explained. 

This streamlined process, powered by Cesium, enables quick visualization of design alternatives and facilitates efficient collection of public input to identify preferred designs for their projects. 

Innovation defines HNTB's 111-year legacy in infrastructure, a commitment clearly seen in their Immersive Media Solutions team's work to transform public engagement by making the abstract concrete. When it comes to Cesium, the team feels like they are just scratching the surface. “As we transition away from manual modeling of existing context, technologies like Cesium will continue to make our workflows much faster,” Willard said. 

Looking into the future, Willard’s sights are set on digital twin delivery, bridging the work between owner-operators and engineering firms.  

“The end goal isn't just about interactive real-time visualizations; it's transforming those visualizations into informational environments—digital twins,” Willard said. “Imagine delivering a complete football stadium or road corridor, complete with all its element-level metadata as a digital twin. That, to me, is a truly valuable deliverable for an engineering firm.” 

Bring accurate real-world context, like Photorealistic 3D Tiles, to your infrastructure projects with Cesium ion. 

HNTB Streamlines Infrastructure Project Visualization with Cesium 

When we issued the call for proposals for this first Cesium Developer Conference, we were curious how many talks we would receive and what themes would stand out. Cesium has a history in aerospace and now serves a thriving community of open source geospatial users across many different industries, including architecture, engineering, and construction (AEC).

We were happy to see submissions from longtime advocates of CesiumJS, 3D Tiles, and other complementary technologies and topics from the open community—and some surprises. In fact, we received so many abstracts that we expanded the total number of presentations from approximately 50 to 90! There will be a ton for attendees to explore at the event.

Register for the Cesium Developer Conference

The biggest concentration of talks came from AEC and digital twin implementations. We were able to accept 21 full sessions and five lightning talks for the conference from submitted AEC/digital twins abstracts. The sessions are split into three groups, two of which will have to run concurrently, because of the volume. It’s a great “problem” to have.

The topics for this category range from aggregating multiple project sites in a single geospatial experience to providing XR experiences for inspecting and exploring asset conditions in the context of a dynamically updated digital representation of a system. Some presenters will focus on using the rich information in building information modeling (BIM) data in geospatial context, while others will focus on using a 3D map as a communication vehicle.

There will be digital twin projects presented that focus on rail, roadways, buildings, campuses, and whole cities. We anticipate these presentations will drive conversations at the conference networking events about how to bring open geospatial concepts into even more corners of the AEC industry.

A few of the organizations who will present in the AEC and Digital Twins track: 

Arcadis will share how they are using Cesium for Unreal Engine for architectural visualization. 

Holosim will present an exciting story about using immersive gaming technologies and 3D Tiles to plan theme parks.

Pennoni will demonstrate how their team uses 3D Tiles and Cesium with game engine technologies to visualize future plans. 

EARTHBRAIN will demonstrate how they are digitalizing the construction process, especially around earth moving workflows. 

Mott MacDonald will discuss how they use Cesium for a web-based GIS for AEC. 

CalTa will demonstrate how they create digital twins from reality capture information to help customers manage real-world assets. 

Project Controls Cubed will present on how they are using iTwin and Cesium to modernize water treatment systems.

Proposed “dolphin” cylinder protection at Delaware River and Bay Authority (DRBA)’s Delaware Memorial Bridge. Courtesy Pennoni.

Where can I catch AEC and Digital Twins material at the conference?

Relevant AEC industry content will appear in user-submitted 20-minute sessions, in 5-minute lightning talks on the main stage, and in demonstrations from key customers and product teams from Bentley Systems and Cesium, showing off AEC capabilities that integrate with open geospatial technologies.

Of course, you’ll also be able to meet the speakers and other attendees at the conference’s socials and meals.

Will there be more than AEC and Digital Twins topics?

Yes. There are six tracks, represented in full sessions and lightning talks. Find out more about the themed tracks in our blog and on the conference pages.

Check regularly for more information about talks, speakers, and activities. 

We’re excited to bring the community together and see the fantastic work being done across the open ecosystem.

AEC and Digital Twins Galore at the Cesium Developer Conference

This summer’s inaugural Cesium Developer Conference, June 23-25 in Philadelphia, is an opportunity for developers to network and learn about the latest and greatest open geospatial tools, standards, and data. For attendees looking for a hands-on experience to learn Cesium, we are excited to offer the "Cesium Deep Dive," a pre-conference training full-day workshop on Monday, June 23.

Register and select the Cesium Deep Dive training

Northern California, USA, using Google Photorealistic 3D Tiles in CesiumJS.

If you are a burgeoning geospatial developer, this workshop is for you.

Bring your own laptop so you’re prepared to build, ask questions, and learn new skills to take your 3D geospatial projects to the next level.

Training includes intros to CesiumJS and Cesium ion, then explores deeper discussions on deploying Cesium Native and using 3D creation engine plugins. 

Engineers will present ready-to-try exercises and will be present to help you explore features of Cesium and 3D Tiles. There will also be opportunities for you to meet 1:1 with engineers if you need help with a specific question.

We’re excited to have two special guests presenting and mentoring attendees throughout the day:

Tim Woodard, Principal Solutions Architect at NVIDIA, will present an update on NVIDIA Omniverse and how using it can benefit open geospatial developers.

Stephen Phillips, Solution Architect at Epic Games, will give an overview of how Unreal Engine can be used in AEC and geospatial applications.

Using Cesium runtime plugins for geospatial context

Unreal Engine for geospatial and AEC applications

NVIDIA Omniverse architecture and applications

Prior to the workshop, the Cesium team will send out information to registered training attendees with instructions for downloads and device configuration so that you are ready when you arrive.

The Grand Canyon, USA, visualized with Cesium for Omniverse.

Will I become a Cesium Certified Developer?

We’ve been getting this question a lot: Will a workshop attendee automatically become a Cesium Certified Developer?

No. Certification is based on one's ability to deploy the skills covered throughout this workshop in their own work. You will learn many of the skills needed for certification over the course of the day, and then it will be up to you to put these skills into practice and submit your project. Our Certification team will be on site throughout the full conference to discuss certification. 

Learn more about becoming a Cesium Certified Developer here.

Sign up for the training through the regular conference registration process. There is an additional fee ($100) to attend the workshop because space is limited. Lunch and refreshments are provided.

Slots are filling up. We look forward to learning with you.

Register for the conference and add the workshop

Deep Dive Workshop at the Cesium Developer Conference

The Cesium Design Tiler now preserves metadata from Industry Foundation Classes (IFC) when tiling into 3D Tiles. This capability has been a popular request from our community and will enable new workflows in architecture, engineering, construction, and operations (AECO) projects combining the built and natural environment in a 3D geospatial context. 

Metadata support includes IFC attributes, property sets, and properties. Property sets are groups of related properties displayed under a common heading. When IFC data is converted into 3D Tiles, this common heading is prepended to the name of each property in the set, ensuring a unique name for each property within the tileset.

IFC attributes, property sets, and properties within 3D Tiles. Data source: BSI (2020) "Medical-Dental Test Files," buildingSMART International—accessible via GitHub.

Users can combine IFC metadata with styling and filtering in CesiumJS to show and hide content based on properties such as IFC class name, globally unique identifier (GUID), or other fields. This enhanced interactivity enables users to focus on the most relevant elements of a complex design model. 

Filtering model content based on IFC class name and GUID in CesiumJS. Data source: BSI (2020) "Medical-Dental Test Files," buildingSMART International—accessible via GitHub.  

Filtering model content based on IFC class name and GUID. Data source: BSI (2020) "Medical-Dental Test Files," buildingSMART International—accessible via GitHub.  

Cesium Design Tiler: IFC Metadata Filtering

IFC metadata can also be used to shade content based on length, area, volume, and other properties. Shading helps AECO project stakeholders visualize and understand the underlying metadata, so they get the insights they need from the model. 

Color ramp shading based on an IFC length property in Cesium for Unreal. Data source: BSI (2020) "Medical-Dental Test Files," buildingSMART International—accessible via GitHub.

The Design Tiler is available via Cesium ion SaaS and Cesium ion Self-Hosted 1.6, and we’ll share its performance in an upcoming blog post. 

Create a Cesium ion account and upload your IFC data to unlock the potential of your design data as 3D Tiles. 

Cesium Design Tiler Now Supports IFC Metadata

Siloed approaches to architecture, engineering, and construction (AEC) can lead to poor communication and collaboration across all phases of projects, resulting in delays and increased costs. DroneDeploy enables stakeholders to examine the entire life cycle of a project with its drone software and viewer, which use 3D Tiles and Cesium ion Self-Hosted to make massive photogrammetry datasets manageable and accessible.

Capture high-resolution aerial data to align teams and keep AEC projects on track. Courtesy DroneDeploy.

DroneDeploy Map Engine

Founded in 2013, DroneDeploy has been using Cesium since 2018. With solutions for construction, agriculture, and insurance, DroneDeploy has built a platform for drone operators to host, visualize, and analyze their aerial imagery and photogrammetry, often on mobile devices. 3D comes into play for these users with accurate models and measurements of new schools or surveys for homeowners who are considering solar panels, for example. Teams can regularly refer to and update the models, examining change over time, making informed decisions, and staying on schedule.

The company has users in 180 countries, who have scanned 1.7 million jobsites, including 2D imagery and 3D models. It has the world’s largest drone data repository.

Photogrammetry of a new high school tiled as 3D Tiles and streamed to DroneDeploy’s custom viewer. Courtesy DroneDeploy.

Operators run DroneDeploy’s software on their drones, capturing buildings and surroundings exactly as they are in the real world. This data is uploaded as aerial imagery or photogrammetry to DroneDeploy’s processing pipeline, which relies on Cesium’s 3D models tiler and point cloud tiler via Cesium ion Self-Hosted in their own environment, and is then available in DroneDeploy’s viewer for analysis and sharing.

Because users’ untiled models are multiple gigabytes, computers and networks might struggle with these massive datasets, especially phones or tablets. Using 3D Tiles means this data is optimized for streaming and designed for precision. 

“Customer datasets vary in size. For bigger datasets—like an entire construction site, multiple square kilometers—getting detail in an untiled model is nearly impossible. Tiling with Cesium allows us to get it in quickly and then refine while maintaining high quality and a high level of performance,” said Joseph Sullivan, DroneDeploy’s 3D engineering lead.

DroneDeploy unifies all its customers’ reality capture data—from drones, robots, 360 cameras, or smartphones—in one platform. Courtesy DroneDeploy.

DroneDeploy: Unified Reality Capture Data

With Cesium’s 3D Tiling Pipeline, DroneDeploy puts its engineering resources into its custom viewer rather than model processing, and users get photorealistic 3D models for decisions based on reality.

To easily bring massive datasets to AEC stakeholders, sign up for a free Cesium ion account.

DroneDeploy Visualizes Construction Sites with Cesium

We are pleased to announce the release of the Cesium Design Tiler and Cesium ion for Autodesk Revit Add-In. This release provides new tools to improve workflows and provide new capabilities that place architecture, engineering, construction, and operations (AECO) content in a 3D geospatial context.

The Cesium Design Tiler and Cesium ion for Autodesk Revit Add-In are now available.

Cesium Design Tiler

These tools transform IFC (Industry Foundation Classes) and Revit files into 3D Tiles, the OGC community standard created by Cesium for streaming massive 3D geospatial datasets. 

The Design Tiler and Revit Add-In provide easier, more efficient workflows for sharing your design data via the web or other visualization platforms like Unreal Engine, Unity, and NVIDIA Omniverse. By incorporating Cesium and 3D Tiles, you are now able to quickly and easily share your data, making it more accessible while also creating more performant applications.

The new Design Tiler and Revit Add-In improve workflows and capabilities that place AECO content in a 3D geospatial context.

Benefit of streaming AECO designs via 3D Tiles

3D Tiles is an open standard for streaming massive, heterogeneous, 3D geospatial data, such as global terrain, entire 3D City models, and high resolution reality data captured from drones, LiDAR scanners, and mobile devices.

3D Tiles optimizes the streaming of complex design and geospatial data providing high performance visualization.

3D Tiles Visualization

3D Tiles are efficient for global data sets like Cesium World Terrain and Google’s Photorealistic 3D Tiles, as well as complex CAD/BIM data with hundreds of thousands of individual features and millions of individual triangles. By leveraging 3D Tiles, your complex design models can now be streamed efficiently to any number of 3D viewers that show your site within its geospatial context. For example, when streaming design data as 3D Tiles with Cesium for Unreal, there are 80-90% fewer draw calls and a 50% faster framerate compared to using untiled static meshes.

The Design Tiler, accessible through Cesium ion’s user interface or via API, adds the ability to quickly and easily convert from IFC to 3D Tiles. IFC is an open standard developed by buildingSMART International that is widely adopted across AECO and BIM. 

The Design Tiler ingests IFC data including entities, metadata, and the underlying parent and child relationships inherent in the IFC data structures. The initial release of the Design Tiler supports most IFC Geometry Types, Entity metadata and embedded geospatial information. We have been working with large federated IFC models containing over 100 individual building models, over 4 million individual objects and in excess of 800 million mesh triangles, all being performantly streamed via 3D Tiles. 

IFC Data model converted to 3D Tiles, manually positioned in Boston, MA, and combined with Google Photorealistic 3D Tiles. Source - BSI (2020) "Medical-Dental Test Files," buildingSMART International, accessible via Github.

With this new tiling capability, you can easily drag and drop your IFC data into your Cesium ion account. The resulting data will be converted to 3D Tiles making it accessible as an asset for streaming into CesiumJS, our runtime integrations with Unreal, Unity, or NVIDIA Omniverse, or any other system that supports 3D Tiles v1.1. If your IFC data contains embedded coordinate reference system information, Cesium will use this information to place the 3D Tiles in the correct location on the globe. If this information is not available, you can use the Cesium ion 3D Tiles Location Editor to quickly and easily set its position, rotation, and scale on the globe. 

Through our AECO Tech Preview Program, Trendspek was given early access to the Design Tiler. Trendspek provides a suite of tools that empower owners, engineers, and contractors to manage infrastructure across the entire asset lifecycle using CesiumJS. Josh Sinclair, Head of Product at Trendspek, said, “The LoD generation is far superior to any BIM conversion tool we have used in the past. The output looks great.” With the Design Tiler, the Trendspek team was able to incorporate BIM data to communicate proposed remedial works packages to their users. 

Trendspek has been able to quickly incorporate BIM as 3D Tiles alongside a reality capture model in their inspection application which uses CesiumJS.

With support for IFC, 3D Tiles can now be generated from a wide range of AECO verticals, including architecture, structural engineering, and MEP (mechanical, electrical, and plumbing) designs. With IFC data as 3D Tiles, there is greater performance, increased interoperability, and less manual effort to optimize this rich content for viewing and distribution.

Complementing the release of the Design Tiler, the Cesium ion for Autodesk Revit Add-In is now available. This Add-In provides a simple process to upload your current 3D View directly to Cesium ion as 3D Tiles. The Cesium ion for Autodesk Revit Add-In connects directly to your existing Cesium ion account and leverages the Design Tiler to generate 3D Tiles. This Add-In is available free and open source under the Apache 2.0 License.

The Cesium ion for Autodesk Revit Add-In connects directly to your existing Cesium ion account and leverages the Design Tiler to generate 3D Tiles.

Autodesk Revit to Cesium ion December 2024

The conversion process is configurable, allowing you to export visible geometry and textures along with all element parameters as metadata to 3D Tiles. The Revit Add-in allows AECO teams to send performant, interactive digital twins to partners over the web or into native runtime engines like Unreal Engine, Unity, or NVIDIA Omniverse via Cesium ion. The conversion and upload to Cesium ion is done transparently, letting architects and other AECO professionals focus on their designs and workflows.

View your Revit models anywhere in the world with accurate geospatial context.

The open source Cesium ion for Autodesk Revit Add-In continues our commitment to openness and interoperability. Download the Add-In directly from the Autodesk App Store, the Cesium downloads page, or the GitHub repo.

The addition of the Design Tiler and Revit Add-In provides a new set of tools for improving workflows that increase the accessibility and interoperability of your design data via open standards. These tools allow you to make your data available quickly and easily by leveraging open standards, combining it with global geospatial content and streaming into an accurate 3D view. 

Get started by creating a Cesium ion account and uploading your IFC data or download the Cesium ion for Autodesk Revit Add-In to unlock the potential of your design data as 3D Tiles.  

Looking for inspiration? Check out our AECO CesiumJS examples on the Cesium Sandcastle or our updated Cesium for Unreal Samples starter project.

If you have any suggestions or need support, please reach out on the Cesium Community Forum. We can’t wait to see what you create with these tools!

Now Available: Cesium Design Tiler and Add-In for Autodesk Revit

Development is progressing on a new open source Add-In for Autodesk Revit that will be released later this year. The Add-In integrates with Cesium ion to generate 3D Tiles, further connecting architecture and geospatial.

Cesium’s Revit Add-In provides a simple workflow for exporting your design data to 3D Tiles available on Cesium ion. Sample data courtesy of Autodesk.

Revit to Cesium ion

The Cesium Revit Add-In is currently being evaluated by participants in Cesium’s AECO Tech Preview Program, which provides early access to software like the Revit Add-In and Cesium’s Design Tiler. 

Program participant Erik Narhi, Computational Design Lead at Buro Happold Engineering, used the Cesium Revit Add-In to easily convert existing Revit design data to 3D Tiles and bring that data into Unreal Engine. 

“The Cesium Revit Add-In adds another layer to the potential of 3D Tiles and Cesium for AEC workflows,” Narhi said. “We are excited to explore how we can leverage it as we continue to push the mainstreaming of game engines and interactive 3D workflows for AEC project design, analysis, and delivery.”

Cesium’s Revit Add-In easily converts your design data to 3D Tiles. Image courtesy of Buro Happold Engineering.

Cesium’s Revit Add-in was designed to complement existing workflows by connecting Revit to Cesium ion with an easy-access, one-click export capability. Much like the Cesium 3ds Max plugin released in 2020, the Revit Add-In connects directly to your Cesium ion account allowing you to accurately place and visualize your designs in real-world environments.

The Revit Add-In, combined with Cesium’s Design Tiler, improves workflows and capabilities placing AECO content in a 3D geospatial context. Sample data courtesy of Autodesk.

Cesium's Revit Add-In converts a project's internal representation using the Cesium ion Design Tiler into 3D Tiles. The Design Tiler is optimized to support the properties of the BIM data and the metadata, materials, and textures within the Revit design file. To improve streaming and rendering performance, the tiling process detects shared geometry and instances them in the exported 3D Tiles. The Revit Add-in allows AECO teams to send performant, interactive digital twins to partners over the web or into native runtime engines like Unreal Engine, Unity, or NVIDIA Omniverse via Cesium ion. The conversion and upload to Cesium ion is done transparently, letting architects and other AECO professionals focus on their designs and workflows.

Exported 3D Tiles include your design data geometry, materials, textures, and metadata to support visualization and analysis. Sample data courtesy of Autodesk.

AECO Metadata Styling

By building integrations through open standards and collaboration with software companies like Autodesk, Cesium will continue to improve workflows for building AECO-focused applications that combine project plans with accurate 3D geospatial data. 

As we move closer to a full release of the Revit Add-In and Design Tiler, we would love to hear your suggestions on the Cesium Community Forum.

Coming Soon: Cesium Add-In for Autodesk Revit

At Cesium, we believe that collaboration is the key to advancing the 3D geospatial ecosystem for the benefit of all. For over a decade, we have supported interoperability with leading GIS providers like Esri to meet the growing need for comprehensive solutions that represent the natural and built environment with reality capture models, BIM/CAD designs, and traditional GIS layers. 

3D Tiles support for Esri products, and collaboration with Esri and standards organizations like the Open Geospatial Consortium ("OGC"), enables users to find the best solutions for their geospatial use cases.

Collaboration enabled with OGC standards like 3D Tiles and I3S to support streaming, analyzing and creating 3D geospatial content and applications.

Esri ArcGIS helps users solve complex GIS problems to show hidden patterns, trends, and relationships. Combining this with efficient streaming and 3D visualization capabilities enables users to build solutions delivering advanced spatial data management and analysis.


The combination of GIS and 3D streaming capabilities can address a number of cases in the rapidly growing area of digital twins. For example, a design firm that is creating a spatially accurate 3D representation of a proposed project that includes utility, traffic, and zoning information can share multiple versions of their detailed architectural models to collect public feedback. Or a community group building a virtual experience of their city can combine 3D buildings with route planning to key landmarks or locations.  Facilitated by open standards like 3D Tiles and Indexed 3D Scene Layers (I3S), Esri and Cesium are helping users unlock geospatial insights, increase access to spatial data, and empower a large and diverse community of users.

Cesium Esri examples

Last fall, Esri announced the integration of 3D Tiles into the ArcGIS System of Record as a way of enhancing 3D GIS workflows. This integration allows users to combine 3D Tiles with other OGC community standard GIS layers, such as Indexed 3D Scene Layers (I3S), for use in exploration tools, analysis, animation, layouts, and more. With 3D Tiles seamlessly integrated, users can elevate their data beyond a realistic visualization by leveraging the analytic power of a complete GIS. 

ArcGIS Reality for ArcGIS Pro and Drone2Map

ArcGIS Reality for ArcGIS Pro and Drone2Map can be used to process aerial and drone imagery to create full resolution Digital Surface Models (DSMs), true orthos, and 3D point clouds, as well as 2D meshes and photo-realistic 3D meshes that can be exported as 3D Tiles.

With ArcGIS Pro, users can visualize 3D Tiles layers together with other 2D or 3D layers, view layers with different spatial references together, drape 2D layers on top of 3D mesh layers, and edit features based on 3D Tiles layers. With 3D Tiles layers, users can now interactively analyze scenes and perform exploratory analysis like viewsheds and view domes. ArcGIS Pro also allows users to share 3D Tiles layers from a scene to ArcGIS Online.

Users can integrate 3D Tiles integrated mesh layers into Scene Viewer. Like the existing Integrated mesh scene layer, a 3D Tiles integrated mesh layer can represent built and natural environments through realistic textures and elevation information and be used in combination with other geospatial content.

Along with other OGC Services, users can add 3D Tiles as a local tileset or via a hosted service in ArcGIS Online or third party web servers to ArcGIS Earth, Esri’s free application for visualizing and exploring geospatial content in 3D.

Both the 200.4 release of the ArcGIS Maps SDKs for Native Apps and the 4.29 release of the ArcGIS Maps SDK for JavaScript adds support for 3D Tiles.  These features allow developers to leverage the power of the Open Geospatial Consortium (OGC) 3D Tiles format, providing a seamless integration of yet another type of 3D geospatial data into their custom applications.

ArcGIS Scene Viewer with 3D Tiles with draped graphics for relative energy ratings and labels for construction years for buildings in the city Utrecht - from Esri Developer IntegratedMesh3DTilesLayer sample application - https://developers.arcgis.com/javascript/latest/sample-code/layers-integratedmesh3dtileslayer/live/

Open and connected APIs and data services from other providers help to unlock the value of the 3D geospatial ecosystem. Cesium has long-supported the integration of ArcGIS Terrain, Imagery, and Map services within CesiumJS.  

Recently, Esri collaborated with Cesium to enable Indexed 3D Scene Layers (I3S) within CesiumJS. This open source contribution from Esri brings extensive collections of I3S content from ArcGIS to CesiumJS developers and users. I3S, an OGC standard, facilitates the efficient transmission of various 3D data types, including discrete 3D objects with attributes, integrated surface meshes, and point cloud data across vast areas, as well as detailed Building Information Model (BIM) content. This capability supports delivery to web browsers, mobile apps, and desktop environments. Currently, the I3S integration into CesiumJS supports 3D Objects, Integrated Mesh, and Building Scene Layer data types, enabling the integration of 3D and 2D data from multiple sources, including Cesium ion and ArcGIS Online, into a single geospatial application.

ArcGIS Terrain and Basemaps in Cesium ion as shown in Esri Developer Tutorials

ArcGIS I3S Services, ArcGIS Basemap and Cesium World Terrain as shown in Esri Developer Tutorials