What Are Digital Models? 9 Reasons Why You Should Use Them
Definition
A digital model is a three-dimensional representation of a product, building or system held as data in software. Digital modelling (digital modeling in US spelling) covers three things product teams often mix up: the CAD model engineers design in, the visual model built for the camera, and the digital twin, which stays connected to the physical product through live data.
A digital model is a three-dimensional representation of a product, building or system held as data in software. Digital modelling (digital modeling in US spelling) covers three things that product teams often mix up: the CAD model engineers design in, the visual model built for the camera, and the digital twin, which stays connected to the physical product through live data.
This page explains the differences and what a product team should own before launch. (In fashion, “digital models” also means virtual people.
That sense is not covered here.)
What a digital model is
A digital model can be anything from a simple geometric placeholder to a detailed, production-accurate design. The important question is what it was built for. A model built to manufacture a part, a model built to photograph a product and a model built to monitor a working machine look similar on screen but do different jobs.
The clearest published line between a model and a twin comes from the Centre for Digital Built Britain. Its Gemini Principles (2018) state that what distinguishes a digital twin from any other digital model is its connection to the physical twin.
Digital model, CAD model, visual model or digital twin
| Model | What it is | Built for | Who keeps it current | Data connection to the real product | What it lacks |
|---|---|---|---|---|---|
| CAD model | The engineering design file | Dimensions, tolerances and manufacture | The engineering team | None; it is updated by hand | Camera-ready edges, materials and lighting |
| Visual model | The model a studio builds for film, stills and interactives | Photoreal images of the product as designed | The studio, against your approved revision | None; it is updated when the design changes | Live data and engineering authority |
| Digital shadow | A model that receives data from the real product | Watching how the product behaves | Updated automatically from the product | One way: from product to model | Any route back to control the product |
| Digital twin | A model connected to the physical product in both directions | Monitoring and decisions about the real thing | Updated continuously through data | Two way | It is an operational system, not a marketing asset |
For a product launch, most teams need the first two and not the last two. XO3D builds the visual model as part of a Master Asset Build: one product, modelled from your CAD, drawings or concept data to full production standard, with look development signed off on your actual product.
On full payment you own the delivered work and the commissioned model. The CAD to CGI guide explains what transfers from CAD to CGI and where it breaks, and product truth sets out the standard we hold the visual model to.
What the camera needs that CAD does not have
A CAD file is the right starting point, but it is built for engineering, not for the camera. Four points from our CAD to CGI guide explain the gap:
- Where the pipeline breaks. Exported CAD often arrives as one merged object. If a part has to open, separate or explode, that hierarchy has to be rebuilt before anything can move. Native files and a well-structured STEP export keep far more of it.
- What accurate does and does not mean. A model built from your CAD and confirmed by your engineers is a strong basis for a technically credible image. It is not an engineering sign-off and it cannot certify a tolerance.
- The things worth gathering. CAD, finish references or samples, photographs, original logo and label artwork, and one named person who can approve the model.
- Which product revision the reference shows. Label the revision of every source. When sources disagree, confirm the intended production version before the model is approved.
CAD edges are a simple example. In CAD they are perfectly sharp; real plastic and metal almost always have a small rounded edge. CAD geometry is also often heavily faceted. So the visual model is usually rebuilt from the CAD for photoreal use rather than rendered straight from it.
Nine reasons to use digital models
1. See the problem before anything is built
A digital model lets a team review shape, fit and movement on screen before tooling or a prototype. For Petalite’s EV charging system, every cable beat was reviewed in greycard before final lighting, confirming sag, weight, bend radius and contact with the client. See the Petalite EV charger case study.
2. Launch before the product exists
Petalite needed to show its 1,000kW SDC charging technology to global stakeholders while the product design was still in active development. XO3D built the launch visuals before a physical unit was manufactured.
The Master Asset produced five animations and 13 stills, and the 31-second launch film was finished in 4K. This is what visualising a product before it is made looks like in practice.
3. One model, many outputs
One well-built scene can serve several outputs, each with its own job. On the AUAR MicroFactory production, selected compositions from the animation became website stills, while additional shots explained the robot’s use inside a factory. Each output still needs its own composition and render; the model is shared, the frames are not.
4. Keep one shared reference
A digital model gives designers, engineers and marketers one reference to work from rather than a stack of separate drawings and samples. It only works if everyone knows which revision it shows, so label the revision and purpose of every source, as our guide on checking which product revision the reference shows explains.
5. Show what a camera cannot reach
A model can be cut open, exploded or turned to angles a physical shoot cannot reach. For Flash Motors, XO3D broke the Infinity X scooter controller into its components in an exploded-view sequence for CES 2024. See the Infinity X controller case study.
6. Change the design by editing, not remaking
Because a digital model is adjustable geometry rather than fixed material, a design change is an edit. For a product still in development, the 3D build can be version-controlled alongside engineering, so changes come in as they happen.
Minor revisions such as a material change are usually absorbed efficiently; a fundamental change to a mechanism is a new scope conversation.
7. Colourways without a sample of each
Product designers can compare materials, colours and finishes on one model without a physical sample for every option. The same applies to marketing: an approved model can be shown in each colourway, and our guide to animated colourways covers how that works in film. Colourway production is its own piece of work, separate from the first model build.
8. Clearer than a drawing
A rendered model shows a stakeholder what a set of drawings asks them to imagine. That shortens the distance between an idea and a shared understanding of it, which matters most when the people approving a design are not engineers.
9. Reuse the owned model for the next brief
A model you own is the start of the next brief, not a one-off cost. On a Master Asset Build, XO3D keeps its production files and archives the project, so a returning brief can build on models, materials and lighting that already exist and are already approved. That is a smaller scope of work than the original build. See Master Asset Build.
When a digital model replaces a prototype or a shoot, and when it does not
A visual model can stand in for a photoshoot when the product does not exist yet, comes in many variants, or needs views a camera cannot get. It does not replace a physical prototype for testing fit, strength or safety, and it is not an engineering sign-off.
Photography also keeps real advantages, for example with craft products whose organic surface variation is part of their character, and imagery centred on real people using the product. Our guide to CGI versus product photography sets out where each approach is stronger.
Sectors that use digital models for product visuals
XO3D builds visual models for product launches in these sectors:
- Consumer electronics: devices, accessories and peripherals. See consumer electronics.
- Industrial engineering: machines and components, often shown in exploded or cutaway views. See industrial engineering.
- Medical and health tech: medical devices, shown accurately for clinicians and buyers. See medical and health tech.
- EV and cleantech: charging and energy systems, often before the hardware is built. See EV and cleantech.
- Robotics and automation: systems whose value is in how they move. See robotics and automation.
- Home appliances: ranges with many models and colourways. See home appliances.
Construction, film and games, and clinical planning also use digital modelling heavily, but with different models and different goals.
What this comes down to
A digital model lets a design be tested, refined and communicated before it is built. For a product team, the useful split is simple: engineering owns the CAD model, the studio builds the visual model from it, and a digital twin is a separate operational system you may never need for a launch.
For the terms used along the way, see our CGI glossary. If you are learning the craft side, XO3D Labs explains what polygons are in 3D, what retopology is and the types of 3D modelling.
To commission a visual model, see our 3D modelling service.
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FAQ
Common questions, answered.
What are digital models?
Digital models are three-dimensional representations of products, buildings or systems held as data in software. They range from simple geometric forms to detailed, production-accurate designs.
What is the difference between a digital model and a digital twin?
A digital twin stays connected to the physical product or asset through data, so it changes as the real thing changes. A digital model has no such connection; it is updated by hand. The Centre for Digital Built Britain's Gemini Principles make the same distinction.
Is a CAD file a digital model?
Yes. A CAD file is the digital model engineers design and manufacture from. It is built for dimensions and tolerances, not for the camera, so it usually needs work before it can be used for photoreal images.
Can I use my CAD for CGI?
Usually, yes, and it is the best starting point. Exported CAD often needs its part hierarchy, edges and materials rebuilt for film and stills, and your engineering team should review the model before any lighting or animation is built on it.
Can a digital model replace product photography?
Sometimes. CGI from a digital model is strong where the product does not exist yet, comes in many variants, or needs internal and exploded views. Photography keeps real advantages elsewhere, such as craft products whose organic surface variation is part of their character, and imagery centred on real people using the product.
Who owns the model after a build?
Under XO3D's terms, on full payment the client owns the final deliverables, including any 3D model commissioned as part of the project. XO3D keeps its production files, such as scene set-ups, rigs and render settings.
Which industries rely on digital modelling?
Engineering, construction, retail, product design, entertainment and healthcare all use digital modelling. XO3D builds visual models for product sectors such as consumer electronics, industrial engineering, medical devices, EV and cleantech, robotics and home appliances.
Start the conversation
Got a product worth showing? Let’s talk about what it needs to do.
We reply to every brief personally, usually within one working day.