What technique is used to create a solid from 2D CAD drawings?

The technique used to create a solid from 2D CAD drawings is extruding. This process involves taking a 2D shape and extending it along a third dimension to generate a three-dimensional object. The extruded solid can have uniform cross-sections or varied profiles depending on the design intent.

Extrusion is widely used in CAD software for its simplicity and effectiveness in converting flat designs into physical representations. For example, if you draw a circle in a CAD program and extrude it upwards, you create a cylinder. This ability to add depth to 2D shapes is fundamental in 3D modeling, allowing designers to produce complex shapes and components used in various engineering and design applications.

Other techniques like revolving or lofting also transform shapes but do so in different ways. Revolving creates solids by rotating a 2D profile around an axis, while lofting generates solids by connecting multiple 2D shapes along a defined path, which adds complexity and variety in shape creation. Assembling typically refers to combining multiple parts into a larger assembly rather than creating a solid from a 2D drawing.