F
Builds the flector reflecting across line.
The flector (gx, gy, gz, 0) — the mirror line's own components with zero glide, so the reflection inherits the line's placement exactly. Reflection is orientation-blind: F(line) and F(-line) build negated values applying the identical motion (see Versor); the glide of G is where the line's orientation does real work. A line at infinity has no unitized mirror form, and no flector is built.
Return
The reflection Flector.
Parameters
line
The mirror Line.
Throws
when line is at infinity — its normal norm √(gx² + gy²) rounds to zero.