(vlax-curve-getPointAtDist ename distance)
The vlax-curve-getPointAtDist function finds the coordinates of the point on a curve at the specified distance from the start point.
ename specifies an entity to be measured.
distance is a floating-point number specifying the distance from the start point.
The function returns a list of three floating-point numbers representing the WCS coordinates of the calculated point. If the function fails, it returns nil.
Examples
: (setq en (entlast))
<EName: 045d4b64>
: (vlax-curve-getPointAtDist en 1.0)
(7.55765 5.55066 0.0)