XO3D Studio · Technical Guide

What is Physically Based Rendering?

The rendering technique that makes the difference between product CGI that looks real and product CGI that looks generated.

Connor Hamilton-Smith, Head of 3D, XO3D Studio

Connor Hamilton-SmithHead of 3D & Director, XO3D Studio

Discuss your brief

The studio behind this guide

Why this matters commercially

XO3D builds every material to physically based standards as a director-led product CGI studio, which is what makes a render accountable to the real product rather than an approximation of it. Worth understanding if you are comparing suppliers, because it separates a studio that engineers a surface from one that eyeballs it until it looks about right.

How XO3D compares to the other five supplier models

Physically Based Rendering (PBR) is a computer graphics rendering methodology that simulates the way light physically interacts with real-world surfaces and materials. PBR uses physically motivated models and approximations to describe how surfaces reflect, absorb, scatter and transmit light. The result still depends on the material inputs, lighting and rendering implementation.

For a published technical reference, the Khronos glTF material specification describes a metallic-roughness PBR model using base colour, metalness and roughness. It is one standardised representation, not a guarantee that a particular render matches a manufactured finish. That match still needs reference material and look-development review.

PBR provides a consistent way to describe surface behaviour across a product CGI scene. Photorealism also depends on geometry, references, lighting and careful review. It is central to our Technical CGI work from CAD. XO3D uses PBR workflows in Keyshot and Cinema 4D on every project.

The key principle: In PBR, a surface behaves the same way in any lighting condition because its properties are defined physically, not artistically tuned for a single setup. This means a material built in PBR looks correct in a studio environment, a lifestyle context, an interior scene, and an outdoor setting without being reworked for each.

Macro of a precision-machined aluminium surface, reconstructed with PBR — Precision-machined aluminium at macro scale, the physical detail PBR reconstructs.

How it works

The physics of light on surfaces.

Real materials interact with light in two fundamental ways: they reflect it and they absorb it. Smooth, polished surfaces (mirror, chrome, patent leather) reflect light specularly, the reflection is sharp and directional. Rough, matte surfaces (unfinished wood, frosted glass, raw concrete) scatter reflected light diffusely, the reflection is soft and spread across the surface. Most real materials combine both properties to varying degrees.

PBR materials are defined by a set of physically derived values that describe this balance precisely: surface roughness, metallic properties, reflectance, subsurface scattering (for materials like skin, fabric, and translucent plastics), and transparency. When these values accurately describe the real-world material, the rendered result is physically correct across all lighting conditions.

Library preset material, generic, unconvincing, lacks specificity

PBR-reconstructed material, built from physical reference, indistinguishable from photography

Library Materials vs PBR Reconstruction

Why material references matter

A material preset can be a useful starting point, but its label does not establish a match to a specific product. Compare the intended finish against physical samples, photographs or manufacturing references. Brushing direction, coating, surface variation and the lighting used for review all affect what a viewer sees.

The Production Implication

What PBR means for your project

At XO3D, material reconstruction takes place before final rendering begins, material tests are produced and shared with clients as part of the pre-production approval process. We study the physical object (or detailed specifications) and build PBR materials that match it. For products in development, we work from material specifications, finish samples, and engineering documentation to reconstruct the intended surface behaviour.

FAQ

PBR questions, answered.

Which software does XO3D use for PBR rendering?

XO3D's primary rendering pipeline uses Keyshot for product rendering and Cinema 4D for animation and modelling. Keyshot is a ray-tracing render engine for product visualisation. Post-production and grading is handled in Adobe Creative Cloud.

Can you tell if a product image is CGI or photography?

With properly executed PBR rendering and custom material reconstruction, the distinction is often imperceptible even to trained eyes. The most common giveaway in lower-quality CGI is surface behaviour, materials that look uniformly lit, specular highlights that don't move correctly as the viewing angle changes, or reflections that are either too perfect or too imprecise. PBR helps model these effects, but it does not remove the need to check the result against the intended product.

Does PBR require the physical product to exist?

No. PBR materials can be constructed from material specifications, finish documentation, and reference samples without the physical product being present. This is what enables XO3D to produce pre-manufacture CGI, we work from engineering specifications to reconstruct the intended material behaviour before the product is manufactured.

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