ocr: Fig2-1: A Patch defined by 4 spline segments from 4 different splines. i Fig2-2: Two patches defined by 5 spline segments from 3 splines. The Patches shares a segment. A B Fig2-3: Une spline forming a closed loop. This doesn't define a I patch, as all 4 segments mustn't be on the same spline! Fig2-4: Two connected splines. The area enc losed by these splines does NOT form a Patch, because 5 segments are used to surround the area. B Fig2-5: TwO closed 4-knot splines connected with four 2-knot splines. The central area is invisible because of the rule described under Fig2-3, so the result is 4 p ...
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