A geometric line segment represented by a start and end point.

[page:Vector3 start] - Start of the line segment. Default is (0, 0, 0).

[page:Vector3 end] - End of the line segment. Default is (0, 0, 0).

Creates a new [name].

[page:Vector3] representing the start point of the line.

[page:Vector3] representing the end point of the line.

Applies a matrix transform to the line segment.

[page:Float t] - Use values 0-1 to return a position along the line segment.

[page:Vector3 target] — the result will be copied into this Vector3.

Returns a vector at a certain position along the line. When [page:Float t] = 0, it returns the start vector,
and when [page:Float t] = 1 it returns the end vector.

Returns a new [page:Line3] with the same [page:.start start] and [page:.end end] vectors as this one.

[page:Vector3 point] - return the closest point on the line to this point.

[page:Boolean clampToLine] - whether to clamp the returned value to the line segment.

[page:Vector3 target] — the result will be copied into this Vector3.

Returns the closets point on the line. If [page:Boolean clampToLine] is true, then the returned value will be
clamped to the line segment.

[page:Vector3 point] - the point for which to return a point parameter.

[page:Boolean clampToLine] - Whether to clamp the result to the range [0, 1].

Returns a point parameter based on the closest point as projected on the line segement.
If [page:Boolean clampToLine] is true, then the returned value will be between 0 and 1.

Copies the passed line's [page:.start start] and [page:.end end] vectors to this line.

[page:Vector3 target] — the result will be copied into this Vector3.

Returns the delta vector of the line segment ( [page:.end end] vector minus the [page:.start start] vector).

Returns the [link:https://en.wikipedia.org/wiki/Euclidean_distance Euclidean distance] (straight-line distance) between the line's [page:.start start] and [page:.end end] points.

Returns the square of the [link:https://en.wikipedia.org/wiki/Euclidean_distance Euclidean distance] (straight-line distance) between the line's [page:.start start] and [page:.end end] vectors.

[page:Line3 line] - [page:Line3] to compare with this one.

Returns true if both line's [page:.start start] and [page:.end end] points are equal.

[page:Vector3 target] — the result will be copied into this Vector3.

Returns the center of the line segment.

[page:Vector3 start] - set the [page:.start start point] of the line.

[page:Vector3 end] - set the [page:.end end point] of the line.

Sets the start and end values by copying the provided vectors.

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]