For each of the following terms or phrases state both a defi

For each of the following terms or phrases, state both a definition and the relevance of the term(s) (how and why the term(s) (how and why the term(s) is/are used) in computer graphics. Coordinate Systems Aliasing, and Anti-aliasing Techniques Graphics Primitives Clipping (2-D) Parallel Viewing Transformations, and Perspective Viewing Transformations

Solution

Coordinate systems:- Coordinate system is spreading very rapidly in computer graphics. It is generally used to build the model frame and later place this model into scene.We often refer it as a scene frame.In this we have idea of coordinate frames. In this 3D coordinate frame consists of 3 axis x,y,z access x denotes horizontal access,y is vertical access and z is the depth access.

Aliasing:- In computer graphics the process which smooth curves and other lines became jagged because the resolution or quality of the image or device is not high enough to represent the smooth curve.Generlly aliasing happens because of the output device monitor or printer which doesn\'t have the enough resolution

Anti Aliasing :- Is the technique which is developed to combat the effects of aliasing.This is the software technique to reduce the jaggies and make the curves and lines should be smooth. Gray-Scaling and the smoothing is the two different techniques used in the Anti-Aliasing.

Graphic Primitive: A basic nondivisible graphical element for input or output within a computer-graphics system is called Graphic Primitive.Most output primitives will be polyline, polymaker and fill area. Any clipping from an output primitive cannot produce another output primitive. Every output primitive will contain line style and pattern associated with them.

Input Primitives - Locator, Choice and Valuator, they have a style of echoing associated with them.

.Clipping (2D): It is amethod of selectively enabling or disabling of rendering operations with a specific ROI. In 2D , clip may be defined with pixels drawn within the boundaries of a window or frame. It is helpful in controlling the selected pixel rendering for aesthetic or artistic purposes.

Parallel Viewing Transformations: These transformations preserves scale and shape of an object in creatig a working drawing. These are mainly used by drafters and engineers. In this transformation a ray will be drawn from the object point with fixed direction, image points will be found at intersection of view plane. The direction of projection will be same from all rays in parallel direction

Perspective Viewing Transformation: This transformation produces natural images as away items appear small compared to nearer items. This is called perspectiv foresortening. Line appears to converge on vanishing point as a side effect. It preserves straight lines.