how exactly did you arrive to -540 for the rotation

[J mundART]

[Wayne Dixon]

It was an estimate.  I started with a guess of around 1.5 revolutions.  360 degrees x 1.5 = 540 (in this case, the negative direction)

[Wojciech Zakroczymski]

That can also be quite easy calculated mathematically: the ball is 1 unit in diameter, so 0.5 in Radius. After some easy calculations: for a full rotation (2 pi or 360 Degrees) it should travel in X direction exactly 3.1515(pi) Blender units. After some more also easy calculations: with this ball size you have to multiply the travelled distance (in my case 5.93 Unit’s) by 2 and you have a rotation in Radians. 

For other sizes: rot = x/r, 

x – travelled distance in X

r – ball radius. 

[Author]

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