at method
Computes a position on the line segment according to the given t value
and stores the result in the given 3D vector. The t value has usually a range of
0, 1 where 0 means start position and 1 the end position.
Implementation
/// [0, 1] where 0 means start position and 1 the end position.
Vector3 at(double t, Vector3 result ) {
return delta( result ).multiplyScalar( t ).add( from );
}