Which feature allows for changes in geometry that automatically updates associated features?

Parametric modeling is a design methodology that relies on relationships and parameters within the geometry. When a designer changes a feature—such as a dimension, a shape, or a position—any other features that are dependent on that geometry will automatically update to reflect the changes. This is essential for iterative design processes where modifications need to propagate throughout the model seamlessly.

In contrast, direct modeling allows for immediate geometric changes without the underlying relationships and constraints. While it provides flexibility in making adjustments, it does not maintain an associative link between features. Surface modeling focuses specifically on the creation of complex shapes and may also involve parametric principles, but it does not specifically address the updating of related features. Assembly modeling deals primarily with how different parts fit together in a larger system and focuses less on the automatic updates of geometry changes within individual components.

Therefore, parametric modeling is the feature that ensures changes in geometry result in automatic updates to associated features, streamlining the design process and enhancing efficiency.