Graphics Projection – Computer Graphics

Graphics Projection – Computer Graphics

Question 1 UGC NET June-2020       n the context of 3D Computer graphics, which of the following statements is/are correct? A) Under perspective projection, each set of parallel lines in the object do not stay parallel in the image (except those that are parallel to the view plane to start with). B) Applying a perspective transformation in the graphics pipeline to a vertex involves dividing by its ‘z’ coordinate. C) Perspective transformation is a linear transformation. Choose the correct answer from the options given below:

A – (A) and (B) only

B – (A) and (C) only

C – (B) and (C) only

D – (A), (B) and (C)

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Question 2 UGC NET June-2020       Given below are different properties of 3D projections from A.D. Identify the correct order on the basis of property true of (i) a perspective projection only (ii) an orthographic projection only (iii) both orthographic and projective transformations and (iv) neither orthographic nor projective transformation, respectively. (A) Straight lines are mapped to straight lines. (B) Distance and angles are (in general) preserved. (C) Far away objects appear the same size as closer ones. (D) Requires homogeneous coordinates in order for it to be encoded into linear transformation. Choose the correct answer from the options given below:

A – D, C, B, A

B – B, C, D, A

C – D, C, A, B

D – C, D, B, A

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