Correct sign in ry mode shapes

sdpm/src/sdpmMotion.cpp

@@ -67,7 +67,7 @@ sdpmVector3d Motion::computeSteady(Element const &e, sdpmVector3d const &ui)
     {
         sdpmDouble rx = _rxMod[n->getId() - 1];
         sdpmDouble ry = _ryMod[n->getId() - 1];
-        flex += _mAmp * sdpmVector3d(-ui(2) * ry, ui(2) * rx, ui(0) * ry - ui(1) * rx) / e.getNodes().size();
+        flex += _mAmp * sdpmVector3d(ui(2) * ry, ui(2) * rx, -ui(0) * ry - ui(1) * rx) / e.getNodes().size();
     }
     return rigd + flex;
 }