Don't Look down the spline

[Haptic]

Hi,
I'd like to have a controller that doesn't look down the spline its following, instead always faces its original forward direction in the xz plane, but still be effected by the splines Direction modifiers on its upwards axis. 
What would be the best place to do this modification?

Thanks
Haptic

[Jake]

See here and here.

The easiest way is to override ApplyTransformRotation() and apply your custom rotation there.