They are definitely separate from any other settings and used along with either twistbar or joint angle settings. After studying some effects with the SFZs on and off, they are added to the twistbar or joint angles then a mean is taken so that: effect on vertex = (TBP + SFZP) / 2 OR (JAP + SFZP) / 2 where TBP is the TwistBar Percent, JAP is the Joint Angle Percent, and SFZP is the Spherical Falloff Zone Percent. So, a point between the "green" joint angles gets rotated 100%. If SFZs are used, and, for instance, the same point is halfway between the red and green spheres, then the effect on the point is (100 + 50) / 2 = 75%. The Twistbar values (StartPt/EndPt) and Joint Angles (Static/Dynamic) are still factored in when SFZs are used. By adjusting either of these with SFZs on, there were differences in which, and by how much, vertices were rotated.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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