diff --git a/examples/.gitignore b/examples/.gitignore
new file mode 100644
index 0000000..3ce612c
--- /dev/null
+++ b/examples/.gitignore
@@ -0,0 +1,2 @@
+*.vtu
+*.pvtu
\ No newline at end of file
diff --git a/examples/t8_step1_coarsemesh.jl b/examples/t8_step1_coarsemesh.jl
index 0e252f9..f34df32 100644
--- a/examples/t8_step1_coarsemesh.jl
+++ b/examples/t8_step1_coarsemesh.jl
@@ -3,7 +3,7 @@
 # In this example we build a coarse mesh with a cube geometry.
 # The cube is meshed with 6 coarse tetrahedra.
 # We then output it in vtu format and destroy it.
-# 
+#
 # How you can experiment here:
 #  - Use Paraview to visualize the output files.
 #  - Change the parameters of t8_cmesh_new_hypercube
@@ -27,7 +27,7 @@ function t8_step1_build_tetcube_coarse_mesh(comm)
     # You can modify the first parameter to build a cube with different
     # tree shapes, i.e. T8_ECLASS_QUAD for a unit square with 1 quadrilateral tree.
     # See t8_eclass.h, t8_cmesh.h for all possible shapes.
-    # 
+    #
     # The second argument is the MPI communicator to use for this cmesh.
     # The remaining arguments are 3 flags that control
     #   do_bcast     - If non-zero only the root process will build the cmesh and will broadcast it to the other processes. The result is the same.
@@ -42,12 +42,12 @@ end
 # Write vtk (or more accurately vtu) files of the cmesh.
 # \param [in] cmesh    A coarse mesh.
 # \param [in] prefix   A string that is used as a prefix of the output files.
-# 
+#
 # This will create the file prefix.pvtu and the file prefix_0000.vtu.
 # If the coarse mesh would be repartitioned, then it would write the .pvtu file
 # and additionally one file prefix_MPIRANK.vtu per MPI rank.
 function t8_step1_write_cmesh_vtk(cmesh, prefix)
-    t8_cmesh_vtk_write_file(cmesh, prefix, 1.0)
+    t8_cmesh_vtk_write_file(cmesh, prefix)
 end
 
 # Destroy a cmesh. This will free all allocated memory.
diff --git a/examples/t8_step4_partition_balance_ghost.jl b/examples/t8_step4_partition_balance_ghost.jl
index 9966f1d..3f9e388 100644
--- a/examples/t8_step4_partition_balance_ghost.jl
+++ b/examples/t8_step4_partition_balance_ghost.jl
@@ -252,8 +252,8 @@ forest = t8_step4_partition_ghost(forest)
 t8_global_productionf(" [step4] Repartitioned forest and built ghost layer.\n")
 t8_step3_print_forest_information(forest)
 
-# Write forest to vtu files.
-t8_forest_write_vtk(forest, prefix_partition_ghost)
+# Write forest to vtu files, including ghost layer.
+t8_forest_write_vtk_ext(forest, prefix_partition_ghost, 1, 1, 1, 1, 1, 0, 1, 0, C_NULL);
 
 #
 # Balance
diff --git a/examples/t8_tutorial_build_cmesh.jl b/examples/t8_tutorial_build_cmesh.jl
index d886970..ab2f22b 100644
--- a/examples/t8_tutorial_build_cmesh.jl
+++ b/examples/t8_tutorial_build_cmesh.jl
@@ -163,7 +163,7 @@ function t8_cmesh_new_periodic_hybrid_2d(comm)
     cmesh = cmesh_ref[]
 
     # 3. Definition of the geometry.
-    linear_geom = t8_geometry_linear_new(2)
+    linear_geom = t8_geometry_linear_new()
     t8_cmesh_register_geometry(cmesh, linear_geom)      # Use linear geometry.
 
     # 4. Definition of the classes of the different trees.
@@ -175,12 +175,12 @@ function t8_cmesh_new_periodic_hybrid_2d(comm)
     t8_cmesh_set_tree_class(cmesh, 5, T8_ECLASS_TRIANGLE)
 
     # 5. Classification of the vertices for each tree.
-    t8_cmesh_set_tree_vertices(cmesh, 0, vertices, 3)
-    t8_cmesh_set_tree_vertices(cmesh, 1, vertices + 9, 3)
-    t8_cmesh_set_tree_vertices(cmesh, 2, vertices + 18, 4)
-    t8_cmesh_set_tree_vertices(cmesh, 3, vertices + 30, 4)
-    t8_cmesh_set_tree_vertices(cmesh, 4, vertices + 42, 3)
-    t8_cmesh_set_tree_vertices(cmesh, 5, vertices + 51, 3)
+    t8_cmesh_set_tree_vertices(cmesh, 0, pointer(vertices, 0), 3)
+    t8_cmesh_set_tree_vertices(cmesh, 1, pointer(vertices, 9), 3)
+    t8_cmesh_set_tree_vertices(cmesh, 2, pointer(vertices, 18), 4)
+    t8_cmesh_set_tree_vertices(cmesh, 3, pointer(vertices, 30), 4)
+    t8_cmesh_set_tree_vertices(cmesh, 4, pointer(vertices, 42), 3)
+    t8_cmesh_set_tree_vertices(cmesh, 5, pointer(vertices, 51), 3)
 
     # 6. Definition of the face neighbors between the different trees.
     t8_cmesh_set_join(cmesh, 0, 1, 1, 2, 0)
@@ -208,7 +208,7 @@ end
 # The mesh consists of two tetrahedra, two prisms, one pyramid, and one hexahedron.
 function t8_cmesh_new_hybrid_gate_3d(comm)
     vertices = Vector{Cdouble}(undef, 24)
-    linear_geom = t8_geometry_linear_new(3)
+    linear_geom = t8_geometry_linear_new()
 
     # Initialization of the mesh.
     cmesh_ref = Ref(t8_cmesh_t())
@@ -409,9 +409,9 @@ cmesh_3D = t8_cmesh_new_hybrid_gate_3d(comm)
 t8_global_productionf("[tutorial] A 3D hybrid cmesh (in style of a gate) has been created.\n")
 
 # Output the meshes to vtu files.
-t8_cmesh_vtk_write_file(cmesh_2D, prefix_2D, 1.0)
+t8_cmesh_vtk_write_file(cmesh_2D, prefix_2D)
 t8_global_productionf("[tutorial] Wrote the 2D cmesh to vtu files.\n")
-t8_cmesh_vtk_write_file(cmesh_3D, prefix_3D, 1.0)
+t8_cmesh_vtk_write_file(cmesh_3D, prefix_3D)
 t8_global_productionf("[tutorial] Wrote the 3D cmesh to vtu files.\n")
 
 #