Returns the point (in WCS) along a curve at the distance specified by the user
Supported Platforms: Windows only
(vlax-curve-getPointAtDist curve-obj dist)
Type: VLA-object
The object to be measured.
Type: Real
The distance along the curve from the beginning of the curve to the location of the specified point.
Type: List or nil
A 3D point representing a point on the curve, if successful; otherwise nil.
Assuming that splineObj points to the spline shown in the example for vlax-curve-getDistAtParam, determine the point at a distance of 1.0 from the beginning of the spline:
(vlax-curve-getPointAtDist splineObj 1.0) (2.24236 2.99005 0.0)