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Which of the following co-ordinates are NOT used in 2d viewing transformation?

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Which of the following co-ordinates are NOT used in 2d viewing transformation?

(a) modelling co-ordinates

(b) viewing co-ordinates

(c) vector co-ordinates

(d) device co-ordinates

This question was posed to me at a job interview.

My query is from Two Dimensional Viewing topic in division 2D Transformation and Viewing of Computer Graphics

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The correct answer is (c) vector co-ordinates

To explain I would say: Vector co-ordinates are used to denote vectors which are physical quantities having magnitude as well as direction. In 2d viewing transformations- Modelling co-ordinates, viewing co-ordinates, Normalised co-ordinates and Device co-ordinates are used.

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