[Solved] How to get position [x,y,z] of vertex of a Line

This is the function that you looking for

getKnotPoint shape spline_index_integer knot_index_integer

Easy draw a spline, select it and run this code to get print knot positions

spl = selection[1]
for s = 1 to (numsplines spl) do
(
	for k = 1 to (numknots spl s) do (format "spline_%_knot_%_pos = %\n" s k (getKnotPoint spl s k))
)

See the result in the listener
Also read this topic from MXS Help
http://docs.autodesk.com/3DSMAX/15/ENU/MAXScript-Help/index.html?url=fil…

Thank you for the quick response!

This brings me one step closer to what I want, but I'm not sure I'm there yet. So this code basically gives me all the coordinates of vertices in a selected spline (is that right? I'm still reading through the Maxscript help in Autodesk). But what I'm looking for is just the coordinate of the one vertex I have selected in the spline. I then want to put that coordinate in a point3 variable, so I can then position my object on that location.

eg.:

obj.pos = vert_coordinate

Is there a simple way to do this?

Yup.
If you have shape with one spline and only one knot selected then

--this will create box object on selected knot
spl = selection[1] --store selected spline in variable
Box length:5 width:5 height:5 pos:(getKnotPoint spl 1 (getKnotSelection sp 1))

If your shape contains multiple splines then you need to use for-loop.
All about splines you have in link that I've posted earlier.

When I run this script I get the following error:

$Line:Line001 @ [6.562747,3.986450,0.000000]
-- Error occurred in anonymous codeblock; filename: ; position: 109; line: 2
-- Frame:
-- Unable to convert: #(2) to type: Integer
OK

spl = selection[1] --store selected spline in variable
Box length:5 width:5 height:5 pos:(getKnotPoint spl 1 (getKnotSelection sp 1)[1])

This is perfect! Thank you.