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SPAkern Global Function int_2_lines_3d

logical int_2_lines_3d(	const SPAposition&	`p1`,
	const SPAvector&	`v1`,
	const SPAposition&	`p2`,
	const SPAvector&	`v2`,
	double&	`dt1`,
	double&	`dt2`)

Finds where two lines defined by positions and directions are closest.

Role: Identical to closest_points() except that it doesn't require unit vectors, and it doesn't return the points. If the positions and vectors are values and first derivatives of curves, then the parameters returned would be the first-order SPAparameter shifts to find the intersection of the curves.

Parameters:

pt1: First SPAposition.
pt2: First vector.
pt3: Second SPAposition.
pt3: Second vector.
pt3: first derivative.
pt3: Second derivative.

This object is included in the file: geom_utl.hxx