Which of the following statements is/are TRUE? Viewing coordinate system
Which of the following statements is/are TRUE?
(i) Viewing coordinate system simulates the effect of moving camera.
(ii) The process of converting an object coordinate in world coordinate system to normalized device coordinate is called viewport-to-window mapping.
- A.
Only (i)
- B.
Only (ii)
- C.
Both (i) and (ii)
- D.
Neither (i) nor (ii)
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Show answer & explanation
Correct answer: A
Answer: Only (i) is correct.
(i) True: The viewing coordinate system (also called the camera or view coordinate system) simulates moving the camera or viewpoint. Applying the viewing transformation changes the coordinate frame so the scene appears as seen from that camera.
(ii) False: Converting coordinates from world space to normalized device coordinates is performed by the viewing and projection stages (model-view and projection transformations leading to clip space and then normalization). The term window-to-viewport (or viewport transformation) refers to mapping normalized device coordinates to actual window or device (screen) coordinates, not the conversion into normalized device coordinates.
Key pipeline stages:
Model/View and Projection transformations: object/world coordinates -> view coordinates -> clip coordinates -> normalized device coordinates.
Viewport (window-to-viewport) mapping: normalized device coordinates -> window/device (pixel) coordinates.