diff --git a/generate_images.py b/generate_images.py
index 01d3c4d7afb1bf9f88508ce6f84c902225c1f12a..4936a2da5f40dbe727ea84c20071088544bbe164 100644
--- a/generate_images.py
+++ b/generate_images.py
@@ -448,9 +448,10 @@ class Mapping:
         pass
 
     def init_t_translation(self, t):
-        self.D[0] = self.deformation["Dx"]*self.phi(t) if ("Dx" in self.deformation.keys()) else 0.
-        self.D[1] = self.deformation["Dy"]*self.phi(t) if ("Dy" in self.deformation.keys()) else 0.
-        self.D[2] = self.deformation["Dz"]*self.phi(t) if ("Dz" in self.deformation.keys()) else 0.
+        self.D[0] = self.deformation["Dx"] if ("Dx" in self.deformation.keys()) else 0.
+        self.D[1] = self.deformation["Dy"] if ("Dy" in self.deformation.keys()) else 0.
+        self.D[2] = self.deformation["Dz"] if ("Dz" in self.deformation.keys()) else 0.
+        self.D *= self.phi(t)
 
     def init_t_rotation(self, t):
         self.C[0] = self.deformation["Cx"] if ("Cx" in self.deformation.keys()) else 0.
@@ -472,31 +473,31 @@ class Mapping:
         self.Rinv[:,:] = numpy.linalg.inv(self.R)
 
     def init_t_homogeneous(self, t):
-        if any(E in self.deformation.keys() for E in ("Exx", "Eyy", "Ezz")):
-            Exx = self.deformation["Exx"]*self.phi(t) if ("Exx" in self.deformation.keys()) else 0.
-            Eyy = self.deformation["Eyy"]*self.phi(t) if ("Eyy" in self.deformation.keys()) else 0.
-            Ezz = self.deformation["Ezz"]*self.phi(t) if ("Ezz" in self.deformation.keys()) else 0.
+        if (any(E in self.deformation.keys() for E in ("Exx", "Eyy", "Ezz"))): # build F from E
+            Exx = self.deformation["Exx"] if ("Exx" in self.deformation.keys()) else 0.
+            Eyy = self.deformation["Eyy"] if ("Eyy" in self.deformation.keys()) else 0.
+            Ezz = self.deformation["Ezz"] if ("Ezz" in self.deformation.keys()) else 0.
             self.F = numpy.array([[Exx,  0.,  0.],
                                   [ 0., Eyy,  0.],
-                                  [ 0.,  0., Ezz]])
+                                  [ 0.,  0., Ezz]])*self.phi(t)
             self.F *= 2
             self.F += numpy.eye(3)
             w, v = numpy.linalg.eig(self.F)
             # assert (numpy.diag(numpy.dot(numpy.dot(numpy.transpose(v), self.F), v)) == w).all(), str(numpy.dot(numpy.dot(numpy.transpose(v), self.F), v))+" ≠ "+str(numpy.diag(w))+". Aborting."
             self.F = numpy.dot(numpy.dot(v, numpy.diag(numpy.sqrt(w))), numpy.transpose(v))
         else:
-            Fxx = self.deformation["Fxx"]*self.phi(t) if ("Fxx" in self.deformation.keys()) else 0.
-            Fyy = self.deformation["Fyy"]*self.phi(t) if ("Fyy" in self.deformation.keys()) else 0.
-            Fzz = self.deformation["Fzz"]*self.phi(t) if ("Fzz" in self.deformation.keys()) else 0.
-            Fxy = self.deformation["Fxy"]*self.phi(t) if ("Fxy" in self.deformation.keys()) else 0.
-            Fyx = self.deformation["Fyx"]*self.phi(t) if ("Fyx" in self.deformation.keys()) else 0.
-            Fyz = self.deformation["Fyz"]*self.phi(t) if ("Fyz" in self.deformation.keys()) else 0.
-            Fzy = self.deformation["Fzy"]*self.phi(t) if ("Fzy" in self.deformation.keys()) else 0.
-            Fzx = self.deformation["Fzx"]*self.phi(t) if ("Fzx" in self.deformation.keys()) else 0.
-            Fxz = self.deformation["Fxz"]*self.phi(t) if ("Fxz" in self.deformation.keys()) else 0.
-            self.F = numpy.array([[Fxx, Fxy, Fxz],
-                                  [Fyx, Fyy, Fyz],
-                                  [Fzx, Fzy, Fzz]])
+            Fxx = self.deformation["Fxx"] if ("Fxx" in self.deformation.keys()) else 0.
+            Fyy = self.deformation["Fyy"] if ("Fyy" in self.deformation.keys()) else 0.
+            Fzz = self.deformation["Fzz"] if ("Fzz" in self.deformation.keys()) else 0.
+            Fxy = self.deformation["Fxy"] if ("Fxy" in self.deformation.keys()) else 0.
+            Fyx = self.deformation["Fyx"] if ("Fyx" in self.deformation.keys()) else 0.
+            Fyz = self.deformation["Fyz"] if ("Fyz" in self.deformation.keys()) else 0.
+            Fzy = self.deformation["Fzy"] if ("Fzy" in self.deformation.keys()) else 0.
+            Fzx = self.deformation["Fzx"] if ("Fzx" in self.deformation.keys()) else 0.
+            Fxz = self.deformation["Fxz"] if ("Fxz" in self.deformation.keys()) else 0.
+            self.F = numpy.eye(3) + (numpy.array([[Fxx, Fxy, Fxz],
+                                                  [Fyx, Fyy, Fyz],
+                                                  [Fzx, Fzy, Fzz]])-numpy.eye(3))*self.phi(t)
         self.Finv = numpy.linalg.inv(self.F)
 
     def init_t_heart(self, t):