Abstract: Presently disclosed is a process and system for assembly-based parametric modeling having a single design environment in which the parts, components, and assemblies thereof may be designed concurrently. In embodiments of the present invention, every assembly has a deterministic parametric history supporting both top-down and bottom-up assembly design methodologies. Top-down components may be built in place, reducing the user interaction required to define the attachment and movement characteristics of the assembly. Bottom-up components may be inserted into an assembly using a parametric Insert Component Feature. The process and system also provides the ability to parametrically define the shape of an assembly in multiple orientations that still regenerate deterministically.

Abstract: A method and apparatus that allows the user of a computer aided design (CAD) system to connect three-dimensional parts to create a three-dimensional assembly using connections that completely define the attachment between the parts attached to each other by that connection. The user can simultaneously define the orientations of the parts and their behavior. “Behavior” includes whether parts are rigidly connected or allowed to move relative to one and other, and if allowed to move, the nature and limits on that movement. Within any movement allowed, the user may specify key discrete orientations known to be important to the function of the assembly, such as orientations that limit movement within the assembly. The connection method creates a smaller, more consistent representation of the underlying constraints of the assembly, improving the reliability, performance, and ease of use of a CAD system in which it is used.