Page 110 - DCAP504_Computer Graphics

Unit 7: 2-D Viewing

7.7 Self Assessment
1. State whether the following statements are true or false:
(a) Zooming is a technique that helps users to slide the camera across the scene, taking in
different parts of it at different times.
(b) Raster graphics comprise arrays of pixels.
(c) To manipulate the size and proportion of the object, the dimensions of the viewport must be
changed.
(d) Occlusion is a stage in which the pixels that are hidden are removed.
(e) The zone of the monitor screen within which a selected object is viewed is known as a
window.
(f) A window should not be described in feet or meters or miles or in any length dimension
horizontally and vertically.
2. Fill in the blanks:
(a) ………………………. is a technique where the size of the object can be changed to view the
object in detail.
(b) A viewport is defined in .................................... coordinates.

(c) If the detail of the resized object is changed, to fit the relevant information into the current
size, then this process is known as.....................................
(d) A ..................................... is used to change the size of the object.
(e) ………………… graphics comprises paths.
3. Select a suitable choice for every question:

(a) Which of the following is a process where all the triangles are filled with pixels known as
fragments?
(i) Occlusion (ii) Rasterization
(iii) Semantic zooming (iv) Tiling
(b) The horizontal movement of a camera when a camera scans an object is called as:

(i) Zooming (ii) Graphic pipeline
(iii) Semantic zooming (iv) Panning
(c) Which of the following is a process in which the values of each pixel, which were rasterized,
are computed on the basis of color, texture, and fog?
(i) Vertex processing (ii) Clipping

(iii) Parameter interpolation (iv) Occlusion
(d) A picture that has been copied several times is known as:
(i) Motif (ii) Tiling
(iii) Viewport (iv) Window
(e) The corners of .............................. are defined with reference to the world coordinate origin:
(i) a window (ii) a viewport

(iii) a graphic pipeline (iv)an image

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