How to fix Path3D tilt smoothing

[deft perch]

Ok I solved my problem by changing godot's Curve class using smooth step and some other things to have a smooth value per point.

const auto smooth = Math::smoothstep(0.0f, 1.0f, E.key);
                    if (E.key >= 0.5f) { // Point B
                        btw[pidx] = Math::lerp(points[i].tilt, points[i + 1].tilt,  Math::lerp(E.key, smooth, points[i + 1].smoothness));
                    }
                    else { // Point A
                        btw[pidx] = Math::lerp(points[i].tilt, points[i + 1].tilt, Math::lerp(E.key, smooth, points[i].smoothness));
                    }

How to fix Path3D tilt smoothing

Without the smoothing.