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computer graphics exam questions and answers updated 2024

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computer graphics exam questions and answers updated 2024 what are world coordinate system - ANSWER-the main frame in the computer graphics in which all others are related to it The primary frame is the world coordinate system (WCS), also known as the universe or global or sometimes model coor...

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Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024

computer graphics exam questions and

answers updated 2024

what are world coordinate system - ANSWER✔✔-the main frame in the computer graphics in which all

others are related to it

The primary frame is the world coordinate system (WCS), also known as the

universe or global or sometimes model coordinate system. This is the base

reference system for the overall model (generally in 3D), to which all other model

coordinates relate.

what are the object coordinate system - ANSWER✔✔-When each object is created in a modelling

program, a point must be picked to be

the origin of that particular object, and the orientation of the object to a set of model

axes

the most related coordinate system to word coordinate system

define viewing transformation and projection transformation - ANSWER✔✔-The viewing transformation

is the operation that maps a perspective view of an object in world coordinates into a physical device's

display space

Projection.

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,Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024

Projection in computer graphics means the transformation of a three-dimensional (3D) area into a two-

dimensional (2D) area. The plane in the area into which we transform (project) objects is called the

'Table'.

projection transformation have two main types which are - ANSWER✔✔-parallel projection

perspectve projection

which type of projection are suitable for the following - ANSWER✔✔-scale architectural diagram

we use the parallel projection

but in realistic rendering of indoor scene we use the perspective projection

what method used in clipping in computer graphics - ANSWER✔✔-cohenen surtherland method are

used

what does cohonen sutherland method depend on? - ANSWER✔✔-inside outside window code

inwhich the code that not have the 0000 will be not accpeted and which have the 0000 will be accepted

coheone sutherland main points - ANSWER✔✔-1-'inside-outside window codes'. To determine whether

endpoints are inside or outside a window

2-As you proceed around the window, nine regions are created - the eight outside regions and the one

inside region

3-. Each of the nine regions associated

with the window is assigned a 4-bit code to identify the region

4-Each bit in the code is set to either a 1(true) or a 0(false):

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rules in the Cohen-Sutherland line-clipping algorithm - ANSWER✔✔-First bit set 1: point lies to the left of

the window, x < xmin

Second bit set 1: point lies to the right of the window, x > xmax

Third bit set 1: point lies below (bottom) of the window, y < ymin

Fourth bit set 1: point lies above (top) of the window, y > ymax

cohen sutherland and logical or - ANSWER✔✔-The logical OR of the endpoint codes determines if the

line is completely inside the

window. If the logical OR is zero, the line can be trivially accepted. For example, if

the endpoint codes are 0000 and 0000, the logical OR is 0000 - the line can be

trivially accepted. If the endpoint codes are 0000 and 0110, the logical OR is 0110

and the line cannot be trivially accepted.

what are the underlying concept of painter algorithm for hidden surface ? - ANSWER✔✔-It relies on the

observation that if you paint on a surface, you paint over anything that had previously been there, thus

hiding it; namely, paint from furthest to nearest polygons.

sort the list of polygons by distance from viewpoint (furthest away at start of list)

repeat the following for all polygons in the ordered list:

draw projected polygon

what are the situation which is not easily handled by the painters algorithm - ANSWER✔✔-not so good

for more complex surface topologies such as certain overlapping polygons or the presence of holes).

types of filling in computer graphics - ANSWER✔✔-recursive filling

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