diff --git a/vcg/math/shot.h b/vcg/math/shot.h
index bba1d928..ab4c52c1 100644
--- a/vcg/math/shot.h
+++ b/vcg/math/shot.h
@@ -509,9 +509,10 @@ void Shot<S, RotationType>::ApplySimilarity( Matrix44<S>   M)
 
   vcg::Matrix44<S> M2 = M;
 
-  M2 = M2 * scalefactor;
-  M2[3][3] = 1.0; //unnecessary, it will multiply a pure rotation
-   
+  M2 = M2 * scalefactor;				// remove the rotation
+  M2[3][3] = 1.0;						 
+  M2[0][3] = M2[1][3] = M2[2][3] = 0;	// remove the translation
+
   rotM = rotM * M2.transpose();
   Extrinsics.SetRot(rotM);
 }