main/src/georegression/metric/Distance3D_F64.java
public static double distance( LineParametric3D_F64 l,
								   Point3D_F64 p ) {

		double x = l.p.x - p.x;
		double y = l.p.y - p.y;
		double z = l.p.z - p.z;

		double cc = x*x + y*y + z*z;

		// could avoid a square root here by computing b*b directly
		// however that is most likely more prone to numerical overflow since the numerator will need to be squared
		// before division can reduce its "power"
		double b = MiscOps.dot(x,y,z,l.slope)/l.slope.norm();

		double distanceSq = cc-b*b;

		// round off error can make distanceSq go negative when it is very close to zero
		if( distanceSq < 0 ) {
			return 0;
		} else {
			return Math.sqrt(distanceSq);
		}
	}
public static double distance( LineParametric3D_F64 l,
								   Point3D_F64 p ) {

		double x = l.p.x - p.x;
		double y = l.p.y - p.y;
		double z = l.p.z - p.z;

		double cc = x*x + y*y + z*z;

		// could avoid a square root here by computing b*b directly
		// however that is most likely more prone to numerical overflow since the numerator will need to be squared
		// before division can reduce its "power"
		double b = MiscOps.dot(x,y,z,l.slope)/l.slope.norm();

		double distanceSq = cc-b*b;

		// round off error can make distanceSq go negative when it is very close to zero
		if( distanceSq < 0 ) {
			return 0;
		} else {
			return Math.sqrt(distanceSq);
		}
	}
Distance from the point to the closest point on the line.

@param l Line. Not modified.
@param p Point. Not modified.
@return distance.