Computer-Aided Design

Reviewed 12 October 2026. CAD definitions, geometry and constraints, STEP information exchange, CAD-to-XR preparation, documented Autodesk and PTC review workflows, and the cited research findings were independently checked against all 21 cited works. Subscription-paper claims were checked only against accessible abstracts, introductions and section excerpts; the Berg and Vance survey was also checked in a full-text PDF. About review dates.

Computer-Aided Design (CAD) is the use of computer software to create, modify and document designs. It includes two-dimensional drawings and three-dimensional models, together with information such as dimensions, annotations and assembly documentation. CAD systems can encode geometric relationships and design rules as well as the visible shape of an object. In extended reality (XR), CAD data can provide the basis for immersive design reviews, virtual prototypes and experiments with designing in a three-dimensional interface. These uses involve different tasks: inspecting an existing design, evaluating a proposed product, or creating and changing its geometry.

For the separately named visualization application, see CAD XR.

Scope and terminology

CAD covers both design work and the production of drawings that communicate it. A two-dimensional CAD drawing can consist of lines, arcs, circles, curves, hatching, text and dimensions. A three-dimensional CAD model can also serve as the source for drawings and views of the design. The term therefore does not require a three-dimensional model or an immersive display.

3D Modeling overlaps with CAD when a designer constructs a three-dimensional representation of a proposed object. CAD additionally includes drawing, dimensions and technical documentation, while its modeling tools can use solid, surface, mesh, freeform or parametric methods. These methods can coexist within one software package; they are not mutually exclusive types of application.

Computer-aided manufacturing (CAM) uses a design to generate manufacturing instructions, such as toolpaths for a computer numerical control machine. CAD and CAM may be integrated in the same product, but generating a design and generating instructions for making it remain distinct operations.

Geometry and design intent

CAD representations support different forms of editing and documentation. A useful distinction is between the geometry visible in a drawing or model and the relationships that govern how it changes.

Aspect	Description
Two-dimensional drafting	Drawings use geometric entities together with dimensions, text and other annotations to communicate a design.
Three-dimensional modeling	Solid and surface methods describe three-dimensional form; mesh and freeform methods are also available in CAD software. The resulting model can supply drawing views as well as a three-dimensional visualization.
Constraints and parameters	Geometric constraints can preserve relationships between objects, while dimensional constraints control values such as lengths, angles and radii. Parameters and expressions can connect these values.
Feature history	In Autodesk Fusion's parametric mode, a timeline records operations such as sketches, modeling features and assembly relationships. Changes can cause dependent features to be recomputed.
Direct editing	Fusion's direct modeling mode allows changes to geometry without recording them in a parametric timeline. Its parametric mode can also contain directly edited base features.

Constraints are relevant to two-dimensional drafting as well as three-dimensional modeling. For example, a drawing can maintain parallel or perpendicular relationships while a designer changes its dimensions. AutoCAD distinguishes unconstrained, underconstrained and fully constrained geometry; a visible shape alone does not reveal which relationships have been specified.

Engineering information and exchange

A CAD exchange file can carry information beyond the shape shown on screen. NIST describes STEP, the ISO 10303 product-data standard, as a format for exchanging parts, assemblies and product and manufacturing information (PMI) among CAD, CAM, engineering analysis and inspection systems. PMI can include dimensions and geometric tolerances. Semantic PMI is computer-interpretable, whereas graphic PMI represents its visual presentation. STEP validation properties can help compare imported geometry with the originating model.

For an XR workflow, transferring visible geometry and transferring engineering behavior are separate problems. A paper on converting kinematic CAD models to virtual reality (VR) identifies the additional work needed to reconstruct mechanisms and animation, and presents a method for transferring kinematic information. Its subject is a conversion methodology, rather than evidence that arbitrary CAD files retain their behavior in every viewer.

Roles in immersive design

Research on VR in engineering and product design covers concepts, modeling, prototyping, evaluation, collaborative design and education. Berni and Borgianni's review distinguishes these purposes.

Role	CAD-related activity
Design review	Participants inspect a proposed design, discuss problems and compare alternatives. Wolfartsberger's VRSmart system used CAD assembly structures to support assembly and disassembly during engineering reviews.
Product and interface evaluation	A virtual prototype supports assessment of a proposed product or its interaction with users. Some systems include physical objects and haptic devices.
Immersive authoring	The user creates or modifies a design through an immersive interface. Berni and Borgianni distinguish this modeling activity from evaluation.

An industrial survey by Berg and Vance found virtual reality systems using head-mounted displays, CAVE projection environments and stereoscopic desktop displays. Tracking lets the view respond to the user's pose; controllers and haptic interfaces provide ways to interact with the scene.

Augmented reality can place a design in a physical setting. PTC documents a Creo workflow in which a CAD design is associated with a spatial target or ThingMark, published as an AR experience and viewed through Vuforia View. Mixed reality review can also require explicit alignment between the physical environment and the virtual model: VRED's documented marker workflow establishes corresponding coordinates for supported MR hardware.

From CAD data to an XR scene

Preparing an immersive model involves selecting and translating the information needed for the review. Berg and Vance describe CAD acquisition, conversion and simplification in industrial VR. An ergonomic review needs appropriate dimensions and spatial relationships, while an appearance review also depends on visual presentation.

Tessellation and fidelity

Many CAD surfaces must be tessellated into polygons for a visualization workflow. Autodesk VRED documents import settings for this conversion, including chord deviation, the permitted distance between the source NURBS surface and the generated mesh. Smaller deviation, tighter normal tolerance or shorter maximum edges can produce a finer mesh with more triangles. VRED can retain source NURBS data to permit later tessellation changes, at the cost of additional memory.

The conversion settings affect both display performance and the representation of the design. Abidi, Al-Ahmari and Ahmad studied this tradeoff in a gearbox model, evaluating triangle count, file size, rendering time and graphical quality while varying translation parameters. Their example illustrates why a smoothly drawn CAD surface can acquire a visibly altered outline after conversion; it does not establish one set of settings suitable for every model or headset.

Preparation stages

The following stages summarize documented concerns in CAD-to-XR workflows. They are not a universal file-format specification.

Stage	Purpose and relevant checks
Select a model and review task	Select the geometry and context needed for the task. Preserve separate geometry for parts that users must manipulate individually.
Import and manage updates	Check the import representation and maintain a connection to revised design data where the software supports it. VRED provides CAD import, source-data retention and Smart References for monitoring and updating referenced files.
Set geometric detail	Choose tessellation settings appropriate to the surfaces being evaluated, and inspect the result for conversion artifacts.
Prepare rendering performance	VRED's XR guidance discusses occlusion culling, merging same-material objects that do not need independent movement, reducing expensive materials and textures, and retessellating geometry where necessary. These operations address different costs in rendering a scene.
Configure review interactions	Establish viewpoints, navigation, floor height and the tools needed to examine alternatives. For MR, configure physical-to-virtual alignment where supported.
Return findings to design work	The review can be followed by further CAD authoring. A 2025 study examined this step by tracking CAD actions after teams reviewed their designs in VR or on a desktop.

Review tools and collaboration

An immersive review interface can expose alternatives and inspection tools without exposing the full CAD authoring interface. VRED's XR Home Menu includes variant sets, saved viewpoints, cameras, teleportation, ground-level calibration and shared pointing tools. Its collaboration controls can synchronize participant positions, and desktop participants can access corresponding review tools. These are capabilities of the documented VRED workflow, rather than features guaranteed by an imported CAD file.

Rendering can also be performed on another computer and streamed to a headset. Autodesk announced availability of Immersive for Autodesk VRED on Apple Vision Pro on 20 May 2026. The described workflow uses NVIDIA RTX rendering systems and CloudXR for visionOS to stream VRED design-review scenes. This is a dated product example of spatial review using CAD-derived visualization data.

Research findings and limits

Studies test particular interfaces, models and review tasks. Their results provide evidence for those conditions, rather than a general ranking of immersive and desktop CAD workflows.

Study	Comparison and reported result	Scope of the evidence
Wolfartsberger (2019)	The VRSmart project included an initial usability evaluation with 72 participants and an industrial evaluation with 16 participants from an engineering company reviewing power units. Compared with Creo View, VR review identified slightly more faults and offered easier access for some service and test-stand participants.	The industrial comparison involved two power-unit models. The paper presents VR as an addition to existing review methods.
Horvat and colleagues (2019)	In a comparison of VR and desktop interfaces for reviewing CAD models, VR produced lower relative errors when participants estimated model dimensions and made some interface-fit assessments easier.	The authors report that model complexity affects the available sensory cues and differences between the interfaces.
Freeman, Salmon and Coburn (published online 2017)	A connection between CAD and VR supplied geometry, selected metadata and an enhanced review toolset. Tests involving a gearbox and engine-design changes found better correct and confident model understanding with the enhanced interface.	Both conditions were VR interfaces. This comparison tests the tools and CAD connection, rather than VR against a desktop display.
Horvat and colleagues (2025)	Fourteen student design teams used either VR or a desktop interface for review with external reviewers. Subsequent work in CAD showed slightly more total actions in the VR group and significantly larger proportions of creation and assembly actions.	The measured outcome was CAD activity after review. It does not establish shorter manufacturing lead times or a universal reduction in rework.

Model complexity, the inspection task and the tools available to the reviewer all affect what an evaluation measures. The 2019 comparison discusses complexity-dependent differences, while the 2025 study examines team review and subsequent work rather than only immediate individual inspection. Results from a dimension-estimation task or a particular toolset should therefore be applied within their reported scope.

Conversion quality can affect the geometry visible to participants. The translation study's assessment of graphical quality alongside rendering performance supports checking the prepared model as well as the review interface.