Hi Tudor,

re:
> crv.evaluateCurvature - how can I access first and second pt of vector ? -> tried -> [], item(), getStartPt()

There is not a first and second point returned, it returns one vector value (with .x, .y, .z - same as a point) for the curvature vector (K) of the curve in the osculating plane at that parameter value. Radius of curvature = 1 / Magnitude K.

https://en.wikipedia.org/wiki/Curvature#Osculating_circle

- Michael