3D parametric modeling is a computer-aided design (CAD) technique that involves creating 3D models using parameters, relationships, and constraints. It allows designers and engineers to build and manipulate 3D objects while maintaining control over various design parameters.
Parameters are used to represent dimensions, angles, or other design features. For example, you might define the length, width, height, and various angles of the object as parameters. These parameters can be given values, formulas, or relationships to each other.
Constraints are rules or relationships that define how certain parts of the model are related. Common constraints include geometric, dimensional, and assembly constraints. These constraints ensure that the model maintains its shape and relationships as you make changes.
Features in 3D models can be related to each other through parametric relationships. For example, you can specify that the height of an object is equal to double its width. If you change the width, the height parameter will automatically adjust to maintain the relationship.