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Only vertices from the subject polygon that are on the _______________ are selected.

(a) lower half

(b) boundary

(c) opaque side

(d) visible side

This question was addressed to me by my school teacher while I was bunking the class.

This interesting question is from Sutherland-Hodgeman Polygon Clipping in chapter 2D Transformation and Viewing of Computer Graphics

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The correct choice is (d) visible side

To elaborate: Only vertices from the subject polygon which are on the visible side are selected and rest of the vertices are clipped.

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