Compare parallel vector directions

Hi all,

i try to compare vector directions of two parallel Lines. (Colinear True/False ?)
Rhino.Geometry.Line.Direction gives me a Vector Objects and i try to compare Vector directions.

Direction1 != Direction2 which is nonsens of course.
These Vectors go in Y direction so X and Z is 0.
is there a way to compare + or - Values or do i need value>0 value<0 value==0 ?

IsParallelTo().

Scroll down the page to see Python example. Notice that this command works with an angle tolerance.

https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Vector3d_IsParallelTo.htm

// Rolf

1 Like

Thanks for the example.
is antiparlell two parallel vectors with opposite directions?

Yes. According to the documentation you interpret the return value like so:

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