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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

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week 3 modeling
WEEK 3: MODELING

amir@um.edu.my

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

amir@um.edu.my

slide3
There are 4 basic types of modeling systems:

1. Polygonal

2. Spline

3. Patch

4. Parametric

amir@um.edu.my

polygonal modelers
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 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

slide7
It uses smooth and natural curves
  • Types of splines:

1. B-spline

2. Bezier

3. NURBS

amir@um.edu.my

patch modelers
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

slide9
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
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

splines
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
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
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

slide17
Operands – shapes selected for Boolean operations
  • Operations  Add, Subtract, Intersection and Split

amir@um.edu.my

turning 2d shapes into 3d objects
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

slide20
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

slide21
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

slide22
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
3D Primitives
  • Cube
  • Cylinder
  • Tube
  • Sphere
  • Torus
  • Cone

amir@um.edu.my

transforms
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
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
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