Optionalpoint: Point3Optionaldistance: numberOptionalvector: number[]Where the ray starts.
OptionaldistanceHow far to travel from point, in multiples of the direction vector's length; a negative
distance goes backwards.
The direction to travel in, used as given; a unit vector makes distance a length in
model units.
A start point, a direction and a distance for
vector.onRay, which finds the point that far along the direction.