Why Do 3D Digital Twins Take So Long to Build?
Why building a real Digital Twin takes more time than most people expect
One of my favorite parts of my job is introducing people to 3D workflows who have never really worked in 3D before. There’s a moment I love, when it clicks. When someone goes from “Why would we do this?” to “Oh… this changes things.”
Recently, though, I got a question that made me pause.
“Why do digital twins take so long to build?”
It sounds simple. But if you work in 3D, you know that question carries a bit of an edge. My first instinct was defensive. Because it just does. It’s complicated. That’s the job.
But that’s not a real answer.
So I stepped back and tried to explain it clearly, even to myself. With an open mind…assuming nothing about the process but genuinely seeing where things are working faster
Photorealism Is Not Forgiving
A 3D Digital Twin is not just a model. It’s a photorealistic, dimensionally accurate replica of something that exists in the physical world. It needs to hold up in marketing, ecommerce zoom, configurators, AR, maybe even engineering reviews.
That means you can’t cheat.
Modern renderers simulate real light. Materials behave according to physics. So the geometry underneath has to behave like reality too.
If you’re modeling something soft, layered, or constructed in a specific way, you often have to build it the way it’s actually built. Thickness, seams, layers, curvature. Not just the outer shell.
You’re not modeling what it looks like.
You’re modeling how it’s made.
That difference adds time.
Modeling, Shading, and Lighting All Have to Agree
You can’t fix weak geometry with great lighting. You can’t hide poor materials behind clever composition.
Modeling, shading, and lighting all have to work together. And they rarely do on the first pass.
So you iterate. You adjust the form. You tweak roughness. You relight. You render again. That refinement loop is where a lot of the hours live. It’s not wasted time. It’s what makes it believable.
Photorealism is the result of alignment, not a single step.
It Has to Match Reality Exactly
A digital twin is not inspired by the product. It is the product.
Exact dimensions. Correct scale. Accurate proportions. Approved finishes. Even small inaccuracies can matter.
On paper, the shortcut is “just convert the CAD.” In reality, CAD models and rendering geometry are built for completely different purposes. Converting between them almost always requires cleanup, optimization, and sometimes rebuilding parts entirely.
It’s detailed work. And detailed work takes time.
The Invisible Workflow Overhead
Most digital twins don’t live in one file. They live across CAD files, DCC scenes, texture projects, exports, render setups, and versioned outputs.
Naming conventions. Scale checks. Metadata. Re-exports. Version tracking.
A surprising amount of time in 3D production is structural, not creative. That invisible overhead adds up.
If I had a magic wand, it might not be for modeling. It might be for workflow automation.
Rendering Still Requires Compute
Even with modern GPUs and denoisers, high-resolution marketing imagery still takes time to render cleanly. If it needs to be production-grade and artifact-free, you’re paying for samples.
Compute has improved. Expectations have improved too.
The Honest Answer
Digital twins take time because they are ambitious. They are trying to replace a physical object with a digital one without losing fidelity.
We are respecting physics.
We are respecting manufacturing.
We are respecting brand standards.
The closer you get to reality, the less room you have to cheat.
And reality is detailed.
I’m glad I didn’t answer that question defensively. It forced me to zoom out and really look at the craft. Digital twins are slow not because artists are slow, but because accuracy, realism, and reusability require care.
And care takes time.
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Hello! Michael Tanzillo here. I am the Head of Technical Artists with the Substance 3D team at Adobe. Previously, I was a Senior Artist on animated films at Blue Sky Studios/Disney with credits including three Ice Age movies, two Rios, Peanuts, Ferdinand, Spies in Disguise, and Epic.
In addition to his work as an artist, I am the Co-Author of the book Lighting for Animation: The Visual Art of Storytelling and the Co-Founder of The Academy of Animated Art, an online school that has helped hundreds of artists around the world begin careers in Animation, Visual Effects, and Digital Imaging. I also created The 3D Artist Community on Skool and this newsletter.
www.michaeltanzillo.com
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This article is fantastic! Having spent years in engineering, I used to get a bit defensive when explaining how digital twins are created. Now, I prefer to showcase the game engine’s capabilities and limitations through demos, and then explain to clients what I need to create a successful digital twin. I also try to collaborate with them on timelines, being clear about the key features and what would be nice to have. As you pointed out in the article, building a good digital twin involves some complex details, especially when it comes to automation and effective production workflows for maximum efficiency.