Intro To Media Tech: Lecture 14

Front 1

3d modelling

Back 1

the process of creating a geometric representation of a 3d object

Front 2

3 modelling workflow

Back 2

-planning

-modeling

-materials

-lighting

-animation

-rendering

Front 3

modelling techniques

Back 3

polygon

non-uniform rational b-spline

Front 4

polygon modelling

Back 4

process of creating a 3d model by defining and manipulating polygons directly manipulating it's edges vertices and faces

Front 5

sub division

Back 5

allows more control of objects

Front 6

multiple primatives

Back 6

union: OR (combining)
difference: NOT (removing)
Intersection: AND (creating)

Front 7

advantages

Back 7

easy to understand;

precision;

large tool library

graphics hardware only renders polygons

Front 8

disadvantages;

Back 8

hard to make smooth surfaces

Front 9

NURBS

Back 9

creating a 3d model using Bézier curves; you define a smooth curve which defines form of polygon

Front 10

NURBS surfaces

Back 10

comprised of surfaces interpolated between a set of bézier curves which are defined by modeller

Front 11

bezier curves

Back 11

defined by control points, which together make a control polygon

Front 12

revolve

Back 12

creates a surface by revolving a profile curve round a pivot point

Front 13

loft

Back 13

creates surface between a series of profile curves

Front 14

extrude

Back 14

creates surface by extruding a profile defined by a curve, alone a path by another curve

Front 15

NURBS Modeling advantages

Back 15

allows created of smooth curved surfaces

great for organic surfaces or industrial desings

Front 16

NURBS disadvantages

Back 16

more complicated

need to be converted to polys before they can be rendered by most graphics cards