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Rotate a vector by quaternion

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Im trying to rotate a vector by quaternion but in houdini i got a weird angle
What I´m doing wrong?
GA_RWHandleV3 myNormal(gdp, GA_ATTRIB_POINT, "N");
GA_FOR_ALL_PTOFF(gdp, ptoff)
xform.translate(0, 1, 0);
newpos = ph.get(ptoff) * xform;
quatRot.assign(1.0, 0.0, 0.0, 0.125); // I think 0.125 mean 45º degree
myNormal.set(ptoff, quatRot.rotate(UT_Vector3(1, 0, 0)));
ph.set(ptoff, quatRot.rotate(newpos));
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