BCA 4th Sem --Regularized Boolean Set Operation primitive Instancing Sweep Representation

• 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

UNIT-II 

Hardcopy Technologies
Display Technologies
Raster-Scan Display System
Video Controller
Random-Scan Display processor
Input Devices for Operator Interaction
~Image Scanners
Working exposure on graphics tools like Dream Weaver, 3D Effects etc
Clipping
Southland- Cohen Algorithm
Cyrus-Beck Algorithm
Midpoint Subdivision Algorithm

UNIT-III 

Geometrical Transformation
2D Transformation
Homogeneous Coordinates and Matrix Representation of 2DTransformations 
composition of 2D Transformations
The Window-to-Viewport
Transformations

Introduction to 3D Transformations Matrix

UNIT-IV 

Representing Curves & Surfaces----

Polygon meshes parametric

Cubic Curves

Quadric Surface

Solid Modeling   Representing Solids

Regularized Boolean Set Operation primitive Instancing Sweep   Representation
Boundary Representations
Spatial Partitioning Representations
Constructive Solid Geometry Comparison of Representations

UNIT-V                           

Multimedia Definition
CD-ROM and the multimedia highway
Computer Animation
(Design, types of animation, using different functions)

UNIT-VI  

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

Regularized Boolean Set Operation primitive Instancing Sweep Representation

Regularized Boolean Set Operation

Solid is bound by surfaces. So we need to also define the polygons of vertices, which form the solid. It must also be a valid representation

This simple component could be produced by gluing two rectangular blocks together and then drilling the hole. Or in CSG terms the union of two blocks would be taken and then the difference of the resultant solid and a cylinder would be taken. In carrying out these operations the basic primitive objects, the blocks and the cylinder would have to be scaled to the correct size, possibly oriented and

then placed in the correct relative positions to each other before carrying out the logical operations.

The Boolean Set Operators used are :

• union : A + B is the set of points that are in A or B.

• intersection : A . B is the set of points that belong to A and B.

• difference : A – B is the set of points that belong to A but not to B.

Note that the above definitions are not rigorous and have to be refined to define the

Regularised Boolean Set Operations to avoid impossible solids being generated

primitive Instancing Sweep Representation Sweep representations are used to construct three-dimensional objects from two-dimensional shapes. There are two ways to achieve sweep: Translational sweep and Rotational sweep. Sweep representations are useful for constructing three-dimensional objects that possess translational, rotational, or other symmetries. We can represent such objects by specifying a two-dimensional shape and a sweep that moves the shape through a region of space. A set of two-dimensional primitives, such as circles and rectangles, can be provided for sweep representations as menu options. Other methods for obtaining two-dimensional figures include closed spline curve constructions and cross-sectional slices of solid objects. The figure below illustrates a translational sweep. The periodic spline curve in Figure (a) defines the object cross-section. We then perform a translational sweep by moving the control point’s p, through p3 a set distance along a straight line path perpendicular to the plane of the cross-section                At intervals along this path, we replicate the cross-sectional shape and draw a set of connecting lines in the direction of the sweep to obtain the wireframe representation shown in Fig (b). An example of object design using a rotational sweep is given in Figure below this time, the periodic spline cross-section is rotated about an axis of rotation specified in the plane of the cross-section to produce the wireframe representation shown in Fig (b).

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