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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

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Week 3 modeling l.jpg


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Modeler Concepts

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

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  • There are 4 basic types of modeling systems:

    1. Polygonal

    2. Spline

    3. Patch

    4. Parametric

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Polygonal Modelers

  • The oldest type of 3D modeling

  • Objects are constructed with polylines and polygons

  • Very useful to create low polygon models –in games

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  • It can be difficult to increase its resolution

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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

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  • It uses smooth and natural curves

  • Types of splines:

    1. B-spline

    2. Bezier

    3. NURBS

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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

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  • Patches can be subdivided to allow more detail

  • Can produce very smooth results

  • Well suited for organic forms modeling

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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

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  • Deformations applied to parametric objects can be adjusted any time

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  • 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

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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

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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;

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  • Operands – shapes selected for Boolean operations

  • Operations  Add, Subtract, Intersection and Split

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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

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  • 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

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  • 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

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  • 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

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3D Primitives

  • Cube

  • Cylinder

  • Tube

  • Sphere

  • Torus

  • Cone

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  • Operations that alter the position, size, or orientation of an object

  • Basic transforms:

    1. Move

    2. Rotate

    3. Scale

    4. Mirror

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

  • Types:

    1. Bend

    2. Skew

    3. Twist

    4. Squash and Stretch

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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)

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