EIE3101 Lec 2 Modeling 1

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Which technique involves defining a 2-D outline that is swept along a predefined path to create a 3-D shape?

Capping

Extrusion

Lathe or revolve

Free-form sweeps (correct)

What is the defining characteristic of regular polyhedra?

They are always 3-D objects

They are composed of polygons (correct)

They have a variable number of sides

They are composed of circles and spirals

What is the purpose of capping in the context of geometric primitives?

To change the size and proportion of the shape

To create holes in 3-D objects

To determine whether the round sides of cones or cylinders are open or closed (correct)

To attach and blend shapes together

Which geometric primitive resembles a donut?

Torus Signup and view all the answers

What is the main similarity between cubes and spheres as geometric primitives?

They are both closed, 3-D objects Signup and view all the answers

Match the following geometric primitives with their defining characteristics:

Cubes = Six-sided, closed, 3-D objects Spheres = Symmetric, closed, 3-D objects Cylinders and Cones = May be shaped by variables like radius, height, and number of divisions Toruses = Resemble a donut and can be built with radial sweeping techniques Signup and view all the answers

Match the following statements with the correct sweeping technique:

Create 3-D shapes by starting with a 2-D outline and extruding it along a straight path along one axis = Extrusion Ability to extrude objects along curved paths of any shape and along any axis or combination of axes = Free-form sweeps Surfaces of revolution are usually created with this technique = Lathe or revolve Simulates a real lathe and sweeps a 2-D outline around one axis = Lathe or revolve Signup and view all the answers

Match the following regular polyhedra with their number of sides:

Tetrahedron = 4-sided Octahedron = 8-sided Dodecahedron = 12-sided Icosahedron = 20-sided Signup and view all the answers

Match the following statements with the correct description of 2-D shapes:

Includes arcs, circles, spirals, triangles, squares, and other polygons = 2-D Shapes The basis for more complex, composite 3-D shapes = Can be used to represent simple shapes Build more complex objects with a variety of utility tools for trimming, attaching, and blending = 2-D Shapes Require almost no modification except for changes to their position in space, size, and proportion in some cases = Can be used to represent simple shapes Signup and view all the answers

Match the following statements with the correct characteristic of geometric primitives:

Variable of radius or diameter = Spheres Commonly defined as polygonal objects = Cylinders and Cones All sides have the same length (the only variable) = Cubes Can also be built with radial sweeping techniques = Toruses Signup and view all the answers

An extrusion is a sweeping technique that involves duplicating and moving 2-D outlines along curved paths of any shape and along any axis or combination of axes.

False Signup and view all the answers

A torus is a 3-D, closed shape that resembles a cylinder bent and stretched so that the two bases touch each other.

False Signup and view all the answers

Regular polyhedra include the 4-sided tetrahedron, 8-sided octahedron, 12-sided dodecahedron, and 20-sided icosahedron.

False Signup and view all the answers

The software-based lathe tool simulates a real lathe, which is a tool composed of a rotating base on which you place a cylinder of wood that is shaped by placing a steep blade on its surface as the base rotates around its vertical axis.

True Signup and view all the answers

Cylinders and cones are commonly defined as polygonal objects and can be shaped by variables such as radius, height, number of longitudinal divisions, number of latitudinal divisions, and whether they are capped or not.

True Signup and view all the answers

Geometric primitives are the building blocks for creating more complex _______ objects.

3-D Signup and view all the answers

_______ is the most powerful derivative modeling technique.

Sweeping Signup and view all the answers

Regular polyhedra include the 4-sided tetrahedron, 8-sided octahedron, 12-sided dodecahedron, and 20-sided _______.

icosahedron Signup and view all the answers

_______ is a 3-D, closed shape that resembles a donut.

Torus Signup and view all the answers

The resulting 3-D model from sweeping depends largely on the complexity of the seed outline and the complexity of the _______.

path Signup and view all the answers

EIE3101 Lec 2 Modeling 1

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Questions and Answers

Which technique involves defining a 2-D outline that is swept along a predefined path to create a 3-D shape?

What is the defining characteristic of regular polyhedra?

What is the purpose of capping in the context of geometric primitives?

Which geometric primitive resembles a donut?

What is the main similarity between cubes and spheres as geometric primitives?

Match the following geometric primitives with their defining characteristics:

Match the following statements with the correct sweeping technique:

Match the following regular polyhedra with their number of sides:

Match the following statements with the correct description of 2-D shapes:

Match the following statements with the correct characteristic of geometric primitives:

An extrusion is a sweeping technique that involves duplicating and moving 2-D outlines along curved paths of any shape and along any axis or combination of axes.

A torus is a 3-D, closed shape that resembles a cylinder bent and stretched so that the two bases touch each other.

Regular polyhedra include the 4-sided tetrahedron, 8-sided octahedron, 12-sided dodecahedron, and 20-sided icosahedron.

The software-based lathe tool simulates a real lathe, which is a tool composed of a rotating base on which you place a cylinder of wood that is shaped by placing a steep blade on its surface as the base rotates around its vertical axis.

Cylinders and cones are commonly defined as polygonal objects and can be shaped by variables such as radius, height, number of longitudinal divisions, number of latitudinal divisions, and whether they are capped or not.

Geometric primitives are the building blocks for creating more complex _______ objects.

_______ is the most powerful derivative modeling technique.

Regular polyhedra include the 4-sided tetrahedron, 8-sided octahedron, 12-sided dodecahedron, and 20-sided _______.

_______ is a 3-D, closed shape that resembles a donut.

The resulting 3-D model from sweeping depends largely on the complexity of the seed outline and the complexity of the _______.

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