Patent
1994-05-27
1997-04-08
Zimmerman, Mark K.
395141, G06T 1720
Patent
active
056196253
ABSTRACT:
A method of generating a free-form surface includes calculating cross boundary derivatives on all the boundary curves forming a face, and storing the results in a memory device (STEP 1), determining whether the cross boundary derivatives calculated at STEP 1 are all polynomials or not, and if there is a rational function, go to STEP 3, if they are all polynomials, go to STEP 4 (STEP 2), creating the control points of a rational surface by using the cross boundary derivatives (STEP 3), and creating the control points of a polynomial surface by using the cross boundary derivatives (STEP 4).
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Chiyokura Hiroaki
Konno Kouichi
Buchel Rudolph
Ricoh & Company, Ltd.
Zimmerman Mark K.
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