now i'm more confused
expanding http://moi3d.com/forum/index.php?webtag=MOI&msg=8818.15 curve explorer
there where only numbers, i've change them to annotation text
1. after saving with annotations, reloading annotations will change positions !
2. crv - evaluateCurvature - understand it's trying to evaluate several connected control pts ?!?!?!
3. tg - evaluateTangent - shoudn't be perpedicular ?
4. evaluateDerivatives - what are those ? (1,2,3 - too far away, pointed direction)




with this script, arrows point different direction (I guess It's correct one, arrows are tangent*)
http://moi3d.com/forum/index.php?webtag=MOI&msg=9781.13