What primarily controls a parametric modeler like SolidWorks?

A parametric modeler like SolidWorks is fundamentally governed by relationships and dimensions. In parametric modeling, dimensions are critical as they define the size and scale of the model, while relationships establish how different features and components interact with one another. For instance, if you change one dimension, all associated features that depend on this dimension will automatically update to reflect those changes. This dynamic linking allows for more flexible and efficient design modifications, making it easier to iterate and refine models quickly.

In this context, while curves and angles, materials and textures, and shapes and sizes are relevant in creating and defining a model, they do not serve as the primary controls. Curves and angles contribute to the geometric shape, but without the governing dimensions and relationships, these elements would lack the ability to adapt and alter the model's structure automatically. Similarly, materials and textures are applied after the geometry is defined and do not influence the underlying parametric design process. Lastly, while shapes and sizes may describe aspects of the model visually, they are the dimensions and relationships that ensure the integrity and functionality of the design as it evolves. This makes relationships and dimensions the cornerstone of how parametric modeling operates in SolidWorks.