- UNIT-I
~The Advantages of Interactive Graphics
~Representative Uses of Computer Graphics
~Classification of Application Development of Hardware and software for computer Graphics
~Overview, Scan:
~Converting Lines
~Scan Converting Circles
~Scan Converting Ellipses
~Multimedia Definition
~CD-ROM and the multimedia highway
~Computer Animation
(Design, types of animation, using different functions)
~Uses of Multimedia
~Introduction to making multimedia –
~The stage of Project
~hardware & software requirements to make good multimedia skills
~Training opportunities in Multimedia Motivation for Multimedia usage
Solid Modeling
Solid modeling (or modeling) is a consistent set of principles for mathematical and computer modeling of three-dimensional solids. Solid modeling is distinguished from related areas of geometric modeling and computer graphics by its emphasis on physical fidelity. Together, the principles of geometric and solid modeling form the foundation of 3D-computer-aided design and in general support the creation, exchange, visualization, animation, interrogation, and annotation of digital models of physical objects.
"Solid modeling is the most advanced method of geometric modeling in three dimensions. Solid modeling is the representation of the solid parts of the object on your computer. The typical geometric model is made up of wireframes that show the object in the form of wires. This wireframe structure can be two dimensional, two and a half dimensional or three dimensional. Providing surface representation to the wire three-dimensional views of geometric models makes the object appear solid on the computer screen and this is what is called solid modeling."
The representation of
solid models use the fundamental idea that a physical object divides
the 3-D Euclidean space into two regions, one exterior and one interior,
separated by the boundary of the solid.
Solid models are:
• bounded
• Homogeneously
three dimensional
• Finite
Representing Solids
There are six common
representations in solid modeling.
i. Spatial
Enumeration: In this simplest form of
3D volumetric raster model, a section of 3D
space is described by a matrix of evenly
spaced cubic volume elements called voxels.
ii. Cell
Decomposition: This is a hierarchical adaptation of spatial enumeration. 3D space is sub-divided into cells. Cells
could be of different sizes. These
simple cells are glued together to describe a solid
object.
iii. Boundary
Representation: The solid is represented by its boundary which consists of a set of
faces, a set of edges, and a
set of vertices as well as their topological relations.
iv. Sweep
Methods: In this technique, a planar shape is moved along a curve. Translational
sweep can be used to create prismatic objects and rotational sweep could be
used for axisymmetric components.
v. Primitive
Instancing: This modeling scheme provides a set of possible object shapes that are described by a set of
parameters. Instances of object shape can be created by varying these parameters.
vi. Constructive Solid Geometry (CSG): Primitive instances are combined
using Boolean set operations to create complex
objects
In most of the modeling packages, the approach used for modeling uses any
one of the following three techniques:
i. Constructive
solid geometry (CSG or C-Rep)
ii.
Boundary representation (B-Rep)
iii. Sweep Methods
कोई टिप्पणी नहीं:
एक टिप्पणी भेजें