Thanks. Do you know what type of spline interpolation is currently used ?

I noticed a stupid mistake repeated on every falling edge of the sawtooth in my previous post which could explain why my result was still fairly wild on the second attempt.

I was assuming a cubic spline interpolation (i.e. 3 points, if I understand correctly) so I want three points in a straight line each side of each of the two repeating angles on the sawtooth. The three points with the angle at the centre point will still be a problem but maybe I can jiggle that to something reasonable once (if?) I get the main upslope and dropoff working more or less correctly.

They shouldn't be this:

                    valueKey 360 360
                    valueKey 360.002777777778 0.00277777777777778
                    valueKey 360.005555555556 0.00555555555555556
                    valueKey 360.994444444444 0.716666666666667
                    valueKey 360.997222222222 0.719444444444444
                    valueKey 361 1

I think they should be more like this:

                    valueKey 360 360
                    valueKey 360.002777777778 359
                    valueKey 360.005555555556 358
                    valueKey 360.994444444444 3
                    valueKey 360.997222222222 2
                    valueKey 361 1

And I've been wondering about the best way to test output of this - watching the numbers on the parameters tab dials isn't a good way. Maybe create a texture map showing the sawtooth and apply that, at the appropriate scale, to an appropriately sized groundplane, then use the valueOpKey sequence key/value to drive the xTranslation/zTranslation of a small red ball. The ball should follow the sawtooth. I think I'll give that a try.

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.