diff --git a/docs/changes.md b/docs/changes.md
index cb3787f4..d729e3ba 100644
--- a/docs/changes.md
+++ b/docs/changes.md
@@ -67,8 +67,8 @@ same for cell/face data: `myobj.celldata["arrayname"]`
 `vedo -r optics_main1`
 `vedo -r optics_main2`
 `vedo -r optics_main3`
-`vedo -r morphomatics_tube`
 `vedo -r warp4`
 `vedo -r voronoi`
-`vedo -r chain`
+`vedo -r drag_chain`
+`vedo -r morphomatics_tube`
 
diff --git a/vedo/cli.py b/vedo/cli.py
index 0680c880..a0237362 100644
--- a/vedo/cli.py
+++ b/vedo/cli.py
@@ -4,15 +4,17 @@
 Command Line Interface module
 -----------------------------
 
-# Type for help
-vedo -h
-
-# Some useful bash aliases:
-alias v='vedo '
-alias vv='vedo -bg blackboard -bg2 gray3 -z 1.05 -k glossy -c blue9 '
-alias vr='vedo --run '        # to search and run examples by name
-alias vs='vedo -i --search '  # to search for a string in examples
-alias vi='vedo --image -x0 -z 1.2 -n ' # to view multiple images
+.. code-block:: python
+
+    # Type for help
+    vedo -h
+
+    # Some useful bash aliases:
+    alias v='vedo '
+    alias vv='vedo -bg blackboard -bg2 gray3 -z 1.05 -k glossy -c blue9 '
+    alias vr='vedo --run '        # to search and run examples by name
+    alias vs='vedo -i --search '  # to search for a string in examples
+    alias vi='vedo --image -x0 -z 1.2 -n ' # to view multiple images
 """
 
 import sys, argparse, os, glob
diff --git a/vedo/docs.py b/vedo/docs.py
index 3f43d6c3..8142ae49 100644
--- a/vedo/docs.py
+++ b/vedo/docs.py
@@ -5,7 +5,7 @@
 ####################################################################################
 ####################################################################################
 ##### To generate documentation you must uncomment this line:
-# from vedo.docs_defs import _substitutions_defs as _defs
+#from vedo.docs_defs import _substitutions_defs as _defs
 
 # Then:
     # cd vedo/docs
diff --git a/vedo/docs_defs.py b/vedo/docs_defs.py
index 3c189063..ae752fcd 100644
--- a/vedo/docs_defs.py
+++ b/vedo/docs_defs.py
@@ -3,13 +3,6 @@
 
 _substitutions_defs = """
 
-.. |thinplate_grid.py| replace:: thinplate_grid.py
-.. _thinplate_grid.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/thinplate_grid.py
-.. |thinplate_grid| image:: https://user-images.githubusercontent.com/32848391/51433540-d188b380-1c4c-11e9-81e7-a1cf4642c54b.png
-    :width: 200 px
-    :target: thinplate_grid.py_
-    :alt: thinplate_grid.py
-
 .. |gyroscope2.py| replace:: gyroscope2.py
 .. _gyroscope2.py: https://github.com/marcomusy/vedo/tree/master/examples/simulations/gyroscope2.py
 .. |gyroscope2| image:: https://user-images.githubusercontent.com/32848391/50738942-687b5780-11d9-11e9-97f0-72bbd63f7d6e.gif
@@ -318,12 +311,12 @@
     :target: clustering.py_
     :alt: clustering.py
 
-.. |thinplate_morphing1.py| replace:: thinplate_morphing1.py
-.. _thinplate_morphing1.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/thinplate_morphing1.py
-.. |thinplate_morphing1| image:: https://user-images.githubusercontent.com/32848391/51403917-34495480-1b52-11e9-956c-918c7805a9b5.png
+.. |warp1.py| replace:: warp1.py
+.. _warp1.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/warp1.py
+.. |warp1| image:: https://user-images.githubusercontent.com/32848391/51403917-34495480-1b52-11e9-956c-918c7805a9b5.png
     :width: 200 px
-    :target: thinplate_morphing1.py_
-    :alt: thinplate_morphing1.py
+    :target: warp1.py_
+    :alt: warp1.py
 
 .. |colorcubes.py| replace:: colorcubes.py
 .. _colorcubes.py: https://github.com/marcomusy/vedo/tree/master/examples/basic/colorcubes.py
@@ -493,13 +486,6 @@
     :target: splitmesh.py_
     :alt: splitmesh.py
 
-.. |thinplate_morphing2.py| replace:: thinplate_morphing2.py
-.. _thinplate_morphing2.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/thinplate_morphing2.py
-.. |thinplate_morphing2| image:: https://user-images.githubusercontent.com/32848391/52142303-9927a300-2658-11e9-98db-ebad4883f99f.png
-    :width: 200 px
-    :target: thinplate_morphing2.py_
-    :alt: thinplate_morphing2.py
-
 .. |projectsphere.py| replace:: projectsphere.py
 .. _projectsphere.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/projectsphere.py
 .. |projectsphere| image:: https://user-images.githubusercontent.com/32848391/52144163-c9be0b80-265d-11e9-9ce6-d6f2b919c214.png
@@ -924,12 +910,12 @@
 
 .. |fenics_logo| image:: https://user-images.githubusercontent.com/32848391/58764910-3940fa80-856d-11e9-8160-af89a5ab5d02.gif
 
-.. |thinplate_morphing_2d.py| replace:: thinplate_morphing_2d.py
-.. _thinplate_morphing_2d.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/thinplate_morphing_2d.py
-.. |thinplate_morphing_2d| image:: https://user-images.githubusercontent.com/32848391/59032715-385ae200-8867-11e9-9b07-7f4f8fbfa5bd.png
+.. |warp3.py| replace:: warp3.py
+.. _warp3.py: https://github.com/marcomusy/vedo/tree/master/examples/advanced/warp3.py
+.. |warp3| image:: https://user-images.githubusercontent.com/32848391/59032715-385ae200-8867-11e9-9b07-7f4f8fbfa5bd.png
     :width: 200 px
-    :target: thinplate_morphing_2d.py_
-    :alt: thinplate_morphing_2d.py
+    :target: warp3.py_
+    :alt: warp3.py
 
 .. |interpolateVolume.py| replace:: interpolateVolume.py
 .. _interpolateVolume.py: https://github.com/marcomusy/vedo/tree/master/examples/volumetric/interpolateVolume.py
diff --git a/vedo/dolfin.py b/vedo/dolfin.py
index 5feccb17..9622fa6f 100644
--- a/vedo/dolfin.py
+++ b/vedo/dolfin.py
@@ -852,8 +852,8 @@ def MeshArrows(*inputobj, **options):
     :param float rescale: apply a rescaling factor to the length
     """
     s = options.pop("s", None)
-    scale = options.pop("scale", 1)
     c = options.pop("c", "gray")
+    scale = options.pop("scale", 1)
     alpha = options.pop("alpha", 1)
     res = options.pop("res", 12)
 
@@ -871,14 +871,14 @@ def MeshArrows(*inputobj, **options):
         printc("\times Error: cannot show Arrows for 1D scalar values!", c='r')
         raise RuntimeError()
 
-    endPoints = startPoints + u_values
+    endPoints = startPoints + u_values *scale
     if u_values.shape[1] == 2:  # u_values is 2D
         u_values = np.insert(u_values, 2, 0, axis=1)  # make it 3d
         startPoints = np.insert(startPoints, 2, 0, axis=1)  # make it 3d
         endPoints = np.insert(endPoints, 2, 0, axis=1)  # make it 3d
 
     actor = shapes.Arrows(startPoints, endPoints,
-                          s=s, scale=scale, alpha=alpha, res=res)
+                          s=s, alpha=alpha, res=res)
     actor.color(c)
     actor.mesh = mesh
     actor.u = u
diff --git a/vedo/mesh.py b/vedo/mesh.py
index f5f114d8..830f3233 100644
--- a/vedo/mesh.py
+++ b/vedo/mesh.py
@@ -22,9 +22,9 @@ def merge(*meshs, flag=False):
     To keep track of the original identities of the input mesh you can set flag.
     In this case a point array of IDs is added to the merged output mesh.
 
-    .. hint:: |thinplate_grid.py|_ |value-iteration.py|_
+    .. hint:: |warp1.py|_ |value-iteration.py|_
 
-        |thinplate_grid| |value-iteration|
+        |warp1| |value-iteration|
     """
     acts = [a for a in flatten(meshs) if a]
 
diff --git a/vedo/pointcloud.py b/vedo/pointcloud.py
index ffa64e4f..83ef4400 100644
--- a/vedo/pointcloud.py
+++ b/vedo/pointcloud.py
@@ -3135,11 +3135,9 @@ def warp(self, sourcePts, targetPts, sigma=1, mode="3d"):
         :param float sigma: specify the 'stiffness' of the spline.
         :param str mode: set the basis function to either abs(R) (for 3d) or R2LogR (for 2d meshes)
 
-        .. hint:: Examples: |thinplate_morphing1.py|_ |thinplate_morphing2.py|_
-            |thinplate_grid.py|_ |thinplate_morphing_2d.py|_ |interpolateField.py|_
+        .. hint:: Examples: |warp1.py|_ |warp3.py|_ |interpolateField.py|_
 
-            |thinplate_morphing1| |thinplate_morphing2| |thinplate_grid|
-            |interpolateField| |thinplate_morphing_2d|
+            |warp1| |warp3|  |interpolateField|
         """
         if isinstance(sourcePts, Points):
             sourcePts = sourcePts.points()
diff --git a/vedo/version.py b/vedo/version.py
index 8815115a..9920a7c6 100644
--- a/vedo/version.py
+++ b/vedo/version.py
@@ -1 +1 @@
-_version='2021.0.5dev7'
+_version='2021.0.6'