| 摘要 |
A set of control curves P<SUB>1</SUB>, P<SUB>2</SUB>, D<SUB>1</SUB>, D<SUB>2 </SUB>act as boundary conditions to a partial differential equation (PDE) which when solved provides a PDE surface patch of a 3D object. Also, a spine S is provided which allows coordinated manipulation of the control curves. The spine S is ideally derived as part of the solution to the partial differential equation. Altering the shape or position of the spine S automatically alters the shape or position of the control curves, such that manipulation of the PDE surface patch then becomes much easier.
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