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Official FVD (Force Vector Design) Thread
NoLimits Coaster

Jackson G. posted on June 9th, 2024

Silveed posted on May 31st, 2024

Problem: I find it hard to stop the rolling of track, especially if I want to transfer to a straight section. I usually try to use the quartic function but figured that this is limiting and describes more the intamin intimidator305 style, while the quintic function gives me room for much more flexibility, in the style of the modern vekomas. But once I want to force the track to be perfectly leveled out for x time, I fail to get it under control. I saw that a particular version of fvd++ has a "roll to zero“ function that would probably solve all my problems. But I am using the program on my m1 air and couldn't find the version with that function included. Does anyone has an idea of how to fix that handling issue?

It looks like you still have -1 deg/s of roll rate entering the straight section. I'm not sure how you did this with just quartics and quintics, but in general I would always suggest just using either cubic or sinusoidal functions for everything and adjusting the tension and centers to make the shaping more natural and nuanced. This allows you to have far more control over just about every aspect of shaping.

Going back to your question, the "roll to zero" function was experimental for a reason and made the program crash a lot. To get your roll to zero without this (which first requires that you bring the roll rate to zero with a +1 deg/s cubic or sinusoidal function), you just have to just use trial and error. First, get the straight section close to flat with shaping you are happy with. Then adjust the previous roll transition's length, center, and tension until the roll value is at or very close to zero.

Hopefully that helps!

Thanks so much for your detailed help! You were absolutely right in that regard, I just needed to bring back the roll rate to 0 deg/s. Lovely to receive such lovely support here :-)

All the best!

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