Parametric modeling concept: in CAD systems that use parametric modeling, the dimension parameters primarily control which aspect of the model?

Introduction / Context:
Parametric modeling links dimensions and constraints to geometry, making models driven by numerical inputs. Changing a parameter updates the feature and all dependent geometry, enabling robust design iteration and automation.

Given Data / Assumptions:

• A parametric CAD environment (e.g., feature-based).
• Dimensions (parameters) are applied to sketches/features.
• Goal: identify what those parameters control.

Concept / Approach:
Parameters drive feature size (length, width, diameter, thickness) and sometimes shape (through equations and constraints). Rendering perspective and shading are visualization settings, not controlled by parametric dimensions.

Step-by-Step Solution:

Verification / Alternative check:
Change a dimensional parameter (e.g., hole diameter). The model updates size/shape while camera perspective and shading remain unaffected unless separately adjusted.

Why Other Options Are Wrong:

• perspective of the model: Controlled by view camera, not by feature dimensions.
• shading used to render the model: A graphics style choice, unrelated to parametric dimensions.
• all of the above: Incorrect because parameters do not control viewing or shading.

Common Pitfalls:
Overconstraining sketches can cause regeneration failures; ensure constraints and dimensions are consistent.

Final Answer:
size and shape of the model features