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btScalar btQuaternion::angle ( const btQuaternion q  )  const [inline]

Return the angle between this quaternion and the other.

q The other quaternion

Definition at line 199 of file btQuaternion.h.

References dot(), and length2().

Referenced by slerp().

            btScalar s = btSqrt(length2() * q.length2());
            btAssert(s != btScalar(0.0));
            return btAcos(dot(q) / s);

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