In 3D CAD, which technique lets designers mold and shape an object volumetrically instead of constructing it solely from edges and curves?

Introduction / Context:
3D modeling approaches differ in how they represent geometry. For realistic design, manufacturing, and simulation, a volumetric representation that supports boolean operations and mass properties is often required.

Given Data / Assumptions:

• The question contrasts techniques based on how they define geometry.
• Goal: identify the approach used to 'mold and shape' volumes rather than just edges or surfaces.

Concept / Approach:
Solid modeling represents the full volume of an object, enabling operations like union, subtract, and intersect, as well as computation of mass, center of gravity, and moments of inertia. Wire-frame models use edges only, while surface models define skins without intrinsic volume. FEM analyzes behavior, not primary geometry creation.

Step-by-Step Solution:

Verification / Alternative check:
Feature-based parametric solid modelers are standard in mechanical CAD for precisely this reason.

Why Other Options Are Wrong:
They do not provide true volumetric, parametric solids suitable for robust manufacturing workflows.

Common Pitfalls:
Assuming surface models are sufficient for all tasks; many manufacturing and simulation tasks require solid bodies.

Final Answer:
Solid modeling