Lecture 9: Object-Based Parametric Modeling

Question 1

Object-based Parametric Modeling

Answer 1

Modeling technique that makes objects defined by parameters and rules set up by the designer to determine geometric and non-geometric features

Question 2

Boundary Representations (B-rep)

Answer 2

Represented shapes as closed, oriented sets of bounded surfaces. Boolean operations (union, intersection, and subtraction) directly interact with the shape.

Question 3

Constructive Solid Geometry (CSG)

Answer 3

Represented shapes as a set of functions that define the primitive polyhedral. Boolean operations are easy to edit.

Question 4

B-rep vs. CSG

Answer 4

B-reps shape is the result of the sequence of operations and object arguments. CSG uses parameters & algebraic formulas defining the shape.

Question 5

Feature-based design parameters

Answer 5

An item in the world generally has multiple subparts with different materials, multiple objects can share parameters. Connected objects behave concurrently and propagate.

Question 6

Types of relations (3)

Answer 6

1. Geometric (distance, angle)
2. Descriptive (coincident, parallel)
3. Equational (PEDMAS)

Question 7

Design behavior

Answer 7

How a parametric model responds & adapts to changes in input parameters or objects

Question 8

Classes

Answer 8

Template definition of the methods and variables in a particular kind of object

Question 9

Instances

Answer 9

Specific realizations of objects.

Question 10

Exceptional objects

Answer 10

Do now follow the standard conventions reflected in the
pre-defined classes.