In many instances, use of some information from 3D digital data set (e.g., the solid model) allows for rapid prototyping of product via various processes, such as 3D printing. Engineering drawings have traditionally contained such information. The 3D digital data set may contain enough information to manufacture and inspect product without the need for engineering drawings. MBD uses such capabilities to establish the 3D digital data set as the source of these specifications and design authority for the product. Modern 3D CAD applications allow for the insertion of engineering information such as dimensions, GD&T, notes and other product details within the 3D digital data set for components and assemblies. By contrast, other methodologies have historically required accompanying use of 2D engineering drawings to provide such details.
The types of information included are geometric dimensioning and tolerancing (GD&T), component level materials, assembly level bills of materials, engineering configurations, design intent, etc. Model-based definition ( MBD), sometimes called digital product definition ( DPD), is the practice of using 3D models (such as solid models, 3D PMI and associated metadata) within 3D CAD software to define (provide specifications for) individual components and product assemblies.
Model-based definition of physical objects is not to be confused with model-based design of software.
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