| OCR Text |
Show 43 bounding auxilliary viewing direction. edges of a surface patch then are be boundary curves surfaces is in Y lie this to maximum Y gives as The the silhouette this so visible auxilIary of edges intersection local determined is where maxima when second the curves of these of one degree the curve in curve with plane will produce intersection merely however, active in list points be an found solutions of two can when a been not of linear simultaneous Y curve in is to the The the plane. be represented endpoints enter scan. the it surface quadric a therefore X This zero. in passed section curves the is intersection These function. the X. intersection with simple of derivative for conic a during edge with X has endpoints. determining coordinates of cannot two the intersection segment curve its by The [i] gradient solve to active a 1) Q newly formed the list. y the maximum add to necessary be equation local a (x curve will linear a Once the All all the on Y. normal The that plane, a by examining (x,y) The in planar. be dependent shown surfaces. can plane, a can be can quadric two and It is explicitly represented between X which surface quadric bounding surface and exit The X scan equation. usefull, are and the Z plane also They are quadratic equations. now |
