Question

If the subject polygon is concave at vertices outside the clipping polygon, the new polygon may have coincident edges.

(a) True

(b) False

I had been asked this question in examination.

My question is based upon Sutherland-Hodgeman Polygon Clipping in section 2D Transformation and Viewing of Computer Graphics

Answer 1

The correct option is (a) True

Explanation: If the subject polygon was concave at vertices outside the clipping polygon, the new polygon may have coincident edges. The result will be the same in case of overlapping edges too.