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SPAkern Global Function bs3_surface_bispan

bs3_surface bs3_surface_bispan(	int	`i`,
	int	`j`,
	bs3_surface	`sur`)

Creates a surface from a simple patch of a surface.

Role: Creates a new surface that consists only of the (i,j)th simple patch of the given surface. The knot vectors of the new surface will have start and end multiplicities equal to the degree; therefore, the new surface will represent a single Bezier patch. In the case of a rational surface, the weights associated with the boundary control points have not been normalized.

Errors: If an error occurs, this function returns a NULL surface.

Effect: Changes model

Parameters:

i: span number in u direction.
j: span number in v direction.
sur: given surface.

This object is included in the file: sp3srtn.hxx