--- a
+++ b/Body/AAUHuman/Trunk/TrunkScalingAndAnatomicalFrame.any
@@ -0,0 +1,25 @@
+/// scaling function to be used by segments in the trunk model
+/// This functions ensures that we transform into the anatomical frame
+/// before applying the geometrical scaling.
+AnyFunTransform3DLin Scale = {
+  PreTransforms = {
+    &...SegmentsLumbar.PelvisSeg.InterfaceMorphingDef.IM_Trunk_To_Leg_AboveSacrum,
+    &...SegmentsLumbar.PelvisSeg.AnatomicalFrame.Scale_Trunk_Pelvis.ScaleAfterInterfaceMorphingDef.Scale.T0,
+    &.GeomScale,
+    &...SegmentsLumbar.PelvisSeg.AnatomicalFrame.Scale_Trunk_Pelvis.ScaleAfterInterfaceMorphingDef.Scale.T1_Inv,
+  };
+  ScaleMat = eye(3,3);
+  Offset = zeros(3);
+};
+
+/// The ScalingNode shows explicitly what reference frame this segment should scale in
+/// for trunk segments scaling should happen in the trunk models anatomical frame
+AnyRefNode  &ScalingNode = AnatomicalFrameTrunk;
+
+/// The whole trunk model share their reference system
+/// This allows us to make a anatomical frame on each trunk segments
+/// That represents this reference system
+AnyRefNode AnatomicalFrameTrunk = {
+  sRel = ...SegmentsLumbar.PelvisSeg.AnatomicalFrameTrunk.sRel;
+  ARel = ...SegmentsLumbar.PelvisSeg.AnatomicalFrameTrunk.ARel;
+};
\ No newline at end of file