I did it but I've noticed that my function works only for rigidbody and doesn't work for softbody.
During the debugging phase I discovered that code in btCollisionWorld.cpp line 607:
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if (collisionShape->isConvex())
So my question is that is possible to perform the sweep test against a soft body? if not how can I take a particular node index where I have to set a Joint or Mass = 0?