Three-Dimensional Modeling

Types of Models  Wireframe  Surface  Primitive  Solids

Wireframe Models

Wireframes do not make good models The same edge and vertex list can describe different objects depending on how they are interpreted.

Surface Model  Wireframe with a cover  Hollow  Only benefit: visualization

Primitives  Three-Dimensional Geometric Figures are combined to form a model

Common Geometric Primitives

Boolean Operations

Solids Modeling  Mechanical Engineering Applications  Begin with a “Solid” piece of material  Manufacture of Prototypes  Design to Manufacture  Recently Available  AutoDesk and GeoPak are developing Civil Engineering Applications

Solids Modeling Example: Science Fair Rotor was drawn using ProEngineer Rotor drawing was downloaded to the CNC machine which then produced the part.

Solids Modeling Example: Science Fair Completed Rotor Generator

Methods of constructing models  Coordinates  Extrusion  Primitives

Coordinate Method

Coordinate Method (continued)

Combination of Methods

MicroStation Wireframe

Solids Modeling Parametric Specification of a Cylinder

Solids Modeling Software