WEEK 3: MODELING

1 / 26

# WEEK 3: MODELING - PowerPoint PPT Presentation

WEEK 3: MODELING Modeler Concepts Modeler  a person who performs the process of creating objects with a 3D software program There are 4 basic types of modeling systems: 1. Polygonal 2. Spline 3. Patch 4. Parametric Polygonal Modelers The oldest type of 3D modeling

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'WEEK 3: MODELING' - libitha

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
WEEK 3: MODELING

amir@um.edu.my

Modeler Concepts
• Modeler a person who performs the process of creating objects with a 3D software program

amir@um.edu.my

There are 4 basic types of modeling systems:

1. Polygonal

2. Spline

3. Patch

4. Parametric

amir@um.edu.my

Polygonal Modelers
• The oldest type of 3D modeling
• Objects are constructed with polylines and polygons
• Very useful to create low polygon models –in games

amir@um.edu.my

Spline Modelers
• Spline  a (usually curved) line, defined by control points.
• It’s resolution-independent
• Well suited to create complex organic shapes, Example: Human faces, Alien spacecraft, Tyrannosaurs

amir@um.edu.my

It uses smooth and natural curves
• Types of splines:

1. B-spline

2. Bezier

3. NURBS

amir@um.edu.my

Patch Modelers
• Use a network of control points to define and modify the shape of the patch
• Control points  control vertices (CVs) – exert a magnet-like influence on the flexible surface of the patch, stretching and tugging it in one direction to another

amir@um.edu.my

Patches can be subdivided to allow more detail
• Can produce very smooth results
• Well suited for organic forms modeling

amir@um.edu.my

Parametric Modelers
• Spline-based (Not all spline modelers are parametric)
• Parametric modeling features objects that retain their base geometry information (default shape, current size, etc)
• This information can still be accessed and changed

amir@um.edu.my

amir@um.edu.my

Splines
• All splines are similar; they consist of a line/shape; controlled by a polyline or polygon
• Three types: B-spline, Bezier spline, and NURBS; Each uses a unique method to control the shape of the spline

amir@um.edu.my

Editing 2D Shapes
• Easily modified; how a shape is modified depends on whether it’s polygonal or spline-based; some operations are common to both
• The basic line and polyline editing operations – moving, adding or deleting line, vertices, or edges

amir@um.edu.my

2D Booleans
• Enable us to build onto a shape by combining it with second shape from the first or carve away at a shape by subtracting a second shape from the first
• Very useful tools;

amir@um.edu.my

Operands – shapes selected for Boolean operations
• Operations  Add, Subtract, Intersection and Split

amir@um.edu.my

Turning 2D Shapes into 3D Objects
• Extrusions pushing the 2D shape into the third dimension by giving it a Z-axis depth; useful for creating block-like object/shapes, column, panels, etc

amir@um.edu.my

Lathing used to create carved cylindrical objects; chair legs and bedposts, A lathe command spins a 2D shape around an axis and extruding it in small steps as it rotates
• Lathe  ideal for creating any kind of radial object such as reels, glass, etc

amir@um.edu.my

Sweeping/lofting A sweep: a single 2D cross-section that is extruded along path
• Sweep Types:

1. Open sweep

2. Helical sweep

3. Closed sweep

amir@um.edu.my

Skinning  similar to open sweep, but here you can use different cross-sectional shapes along the path
• It creates a surface to bridge the cross-sections

amir@um.edu.my

3D Primitives
• Cube
• Cylinder
• Tube
• Sphere
• Torus
• Cone

amir@um.edu.my

Transforms
• Operations that alter the position, size, or orientation of an object
• Basic transforms:

1. Move

2. Rotate

3. Scale

4. Mirror

amir@um.edu.my

Deforms
• Enable you to alter primitives/other objects in subtle or dramatic ways
• Types:

1. Bend

2. Skew

3. Twist

4. Squash and Stretch

amir@um.edu.my

Duplicating Mesh
• Objects and shapes can be duplicated via several ways:

1. Copying and Instancing(use clone or copy operation)

2. Arrays (Eg. Basic linear array, Linear array with rotation, linear array with scaling)

amir@um.edu.my