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Verlet integration via Blueprint (rope) NEED HELP

Im trying to recreate CableComponent using splines, plus since im not a good programmer, im making it with blueprints only :slight_smile:
Here is what i’ve got:
ae384ae7858c0a5627d57161c352d65ae1e4f446.gif

Right now its working not rly good, coz there are some strange things going on - when im fixing first and last points, instead of making perfect arc my “rope” is shrinking to one side mostly.
And as u can see there are different behaviors of the “rope” when im fixing first or last points.
I think the problem is in my constraints solver algorithm. If someone could take a look at my blueprint, i would be rly glad :slight_smile:

Here is my blueprint:
https://drive.google.com/file/d/0B3lymdSbe8MxdWY2NWlDbkhVNTg/view?usp=sharing