Geometry & modeling
Shrinkwrap model
Definition
A shrinkwrap model is a lightweight CAD derivative that represents the exterior of a source part or assembly with a selected collection of surfaces or simplified solid geometry. It is used for space claims, fit checks, large-assembly performance, and controlled external sharing without carrying every internal component.
Also known as: shrinkwrap, CAD shrinkwrap
Updated
What a shrinkwrap can carry#
Creo 12 Help describes a shrinkwrap model as a separate part made from surfaces that represent the source model's exterior. Creation options can close holes and gaps, control the level of detail, include selected datum geometry, use exact mass properties from the source, and export the result to neutral formats.
The result can support visualization, space-claim studies, form and fit work, and interference checks without loading or disclosing every internal component. The retained geometry still has to match the downstream question. A coarse envelope cannot replace exact mounting or connection interfaces.
Model and source have separate lives#
Creo's exported shrinkwrap model is stored as a separate part and is not associative. It does not update when the source changes. That separation is useful for an external delivery, but each source revision requires regeneration and validation of the derivative.
Other systems use terms such as silhouette, envelope, simplified part, or derived configuration for related workflows. Their update behaviour and stored data differ, so the product's actual file and reference rules matter more than the label.
Limits#
A shrinkwrap reduces included detail; it does not prove that the package reveals no sensitive information. Check the delivered file for exact exterior features, mass properties, datums, custom properties, hidden bodies, and external references, then record the source revision and intended use.
Sources
Related terms
Assembly
An assembly is a CAD model made of multiple parts or subassemblies positioned relative to each other with mates or joints. Assemblies are where fit, clearance, interference, and motion get checked.
Defeaturing
Defeaturing is the controlled removal or replacement of CAD components, bodies, and geometric details to create a simpler derivative for a defined downstream task. It can improve performance and reduce exposed design information, but the result must retain every interface and property required by that task.
Lightweight component
A lightweight component is an assembly part or subassembly loaded with only a subset of its model data, while additional data is loaded when an operation requires it. The technique can reduce opening and rebuild work without deleting the authoritative component.