"Evaluate Curve" node outputs weird FreeCAD tangents values

[rendetto]

FreeCAD curve tangents output differs from SV and Geomdl

This is the test file I'm using:
FreeCAD_NURBS_Curve_Tangents_Issue2.zip

[portnov]

I suspect they are just not normalized...

[rendetto]

You seem right, because the direction looks the same, although after a normalize the values didn't change (weird?)

The other thing I found is with the Curvature and Torsion values. Again FreeCAD differs from other implementations.

Here's the file:
FreeCAD_NURBS_Curve_Issues.zip

[rendetto]

Also normals and binormals have slight differences at T=0.0 and T=1.0

Test file updated:
FreeCAD_NURBS_Curve_Issues.zip

[rendetto]

A small off-topic:
I just checked the surfaces(normals, tangents, curvatures) and there are no such problems.

[rendetto]

Just checked the test file I did, and none of the above issues are solved. @portnov can you check that?
Thanks

[rendetto]

A small update here.
It appears that FreeCAD tangent vectors are in fact OK. FreeCAD tangents are normalized by default in oppose to Geomdl and Sverchok ones. That explains why, when I normalized a FreeCAD tangent, its value didn't change.

Still no clue why curvature and torsion are so different.
@portnov I guess we can close this issue and open one specifically for Curve Frame, Curvature and Torsion output?

[rendetto]

Closing this issue and opened one for Curve Curvature #3804