There are two ways to get the track 'inverted'. One way is to set the roll angle of the track to 180 degrees. The other is to use the afore mentioned Rel Rol button.
The Rel Rol button is actually only required when doing vertical track but is useful in other situations as well. It sets the roll angle of the selected vertrex relative to the roll angle of the previouis vertex. So for example if the previoius vertex were set to 45 degrees and you set Rel Rol for the selected vertex, then it would snap to 45 degrees but be labled as 0 degrees (relative to). Get it?
It takes some getting used to but once you understand the concepts it really is quite intuitive.
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