IDP.Math.KArc3d.getTangent() method

获得圆弧一点处的切向量。 注意：需要保证传入点在圆弧上。

Get arc's tangent vector of a point on the arc. NOTE: the caller need to make sure the point is on the arc.

Signature:

getTangent(point: KPoint3d): KVector3d;

Links: getTangent(point: KPoint3d): KVector3d;

Parameters

Parameter	Type	Description
point	KPoint3d	圆弧上一点。 A point on the arc.

Returns:

KVector3d

切向量。

The tangent vector.