diff --git a/examples/models/vrml/test/extrusion1.wrl b/examples/models/vrml/test/extrusion1.wrl
new file mode 100644
index 0000000000000000000000000000000000000000..db55c49436b5833337939d16f8a9fb34901c1018
--- /dev/null
+++ b/examples/models/vrml/test/extrusion1.wrl
@@ -0,0 +1,54 @@
+#VRML V2.0 utf8
+# X3D-to-VRML-97 XSL translation autogenerated by X3dToVrml97.xslt
+# http://www.web3d.org/x3d/content/X3dToVrml97.xslt
+# Generated using XSLT processor: SAXON 9.1.0.2 from Saxonica
+
+# [X3D] VRML V3.0 utf8
+# PROFILE Immersive
+# [X3D] version=3.0
+# [X3D] noNamespaceSchemaLocation=http://www.web3d.org/specifications/x3d-3.0.xsd
+# [head]
+
+# META "title" "Figure15.10ExtrudedRoom.x3d"
+# META "creator" "Figure 15.10, The VRML 2.0 Sourcebook, Copyright [1997] By Andrea L. Ames, David R. Nadeau, and John L. Moreland"
+# META "reference" "http://www.wiley.com/legacy/compbooks/vrml2sbk/ch15/15fig10.htm"
+# META "translator" "Don Brutzman"
+# META "created" "20 August 2000"
+# META "modified" "14 January 2010"
+# META "description" "An extruded room using a floor plan as the cross section."
+# META "identifier" "http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter15-Extrusion/Figure15.10ExtrudedRoom.x3d"
+# META "generator" "X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"
+# META "license" "../../license.html"
+
+# [Scene] ========== ========== ==========
+
+NavigationInfo { type [ "EXAMINE" "ANY" ] } ###  Default X3D NavigationInfo
+
+# Computational cost of Extrusion compared to IndexedFaceSet: quicker to download, takes time to calculate polygonal faces and normals during initial loading, equally fast at run time.
+# Authoring capabilities of Extrusion compared to IndexedFaceSet: can be more complicated to express, but also can provide great detail with much less effort.
+# First position and rotate viewpoint into positive-X-Y-Z octant using a Transform
+Transform {
+  rotation 0 1 0 0.758
+  translation 6 3 6
+  children [
+      Viewpoint {
+        description "Extruded room with a doorway"
+        orientation 1 0 0 -0.2
+        position 0 0 0
+      }
+  ]
+}
+Shape {
+  appearance Appearance {
+    material Material {
+      diffuseColor 1 0.9 0.7
+    }
+  }
+  geometry Extrusion {
+    convex FALSE
+    creaseAngle 0.785
+    crossSection [ -0.5 1.0 -0.5 0.8 -1.8 0.8 -1.8 -0.8 1.8 -0.8 1.8 0.8 0.5 0.8 0.5 1.0 2.0 1.0 2.0 -1.0 -2.0 -1.0 -2.0 1.0 -0.5 1.0 ]
+    solid FALSE
+    spine [ 0 0 0 0 2 0 ]
+  }
+}
diff --git a/examples/models/vrml/test/extrusion2.wrl b/examples/models/vrml/test/extrusion2.wrl
new file mode 100644
index 0000000000000000000000000000000000000000..e64078d1eeeb145c2041d1c132de39b4bb368669
--- /dev/null
+++ b/examples/models/vrml/test/extrusion2.wrl
@@ -0,0 +1,51 @@
+#VRML V2.0 utf8
+# X3D-to-VRML-97 XSL translation autogenerated by X3dToVrml97.xslt
+# http://www.web3d.org/x3d/content/X3dToVrml97.xslt
+# Generated using XSLT processor: SAXON 9.1.0.2 from Saxonica
+
+# [X3D] VRML V3.0 utf8
+# PROFILE Immersive
+# [X3D] version=3.0
+# [X3D] noNamespaceSchemaLocation=http://www.web3d.org/specifications/x3d-3.0.xsd
+# [head]
+
+# META "title" "Figure15.13ExtrudedPyramid.x3d"
+# META "creator" "Figure 15.13, The VRML 2.0 Sourcebook, Copyright [1997] By Andrea L. Ames, David R. Nadeau, and John L. Moreland"
+# META "reference" "http://www.wiley.com/legacy/compbooks/vrml2sbk/ch15/15fig13.htm"
+# META "translator" "Don Brutzman"
+# META "created" "20 August 2000"
+# META "modified" "11 January 2014"
+# META "description" "A pyramid built by scaling a square cross section to 0.01 at the pyramid apex."
+# META "identifier" "http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter15-Extrusion/Figure15.13ExtrudedPyramid.x3d"
+# META "generator" "X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"
+# META "license" "../../license.html"
+
+# [Scene] ========== ========== ==========
+
+NavigationInfo { type [ "EXAMINE" "ANY" ] } ###  Default X3D NavigationInfo
+
+# Computational cost of Extrusion compared to IndexedFaceSet: quicker to download, takes time to calculate polygonal faces and normals during initial loading, equally fast at run time.
+# Authoring capabilities of Extrusion compared to IndexedFaceSet: can be more complicated to express, but also can provide great detail with much less effort.
+# First position and rotate viewpoint into positive-X-Y-Z octant using a Transform
+Transform {
+  rotation 0 1 0 0.758
+  translation 4 2 4
+  children [
+      Viewpoint {
+        description "Extruded pyramid"
+        orientation 1 0 0 -0.3
+        position 0 0 0
+      }
+  ]
+}
+Shape {
+  appearance Appearance {
+    material Material {
+      diffuseColor 1 0.5 0
+    }
+  }
+  geometry Extrusion {
+    crossSection [ -1 1 1 1 1 -1 -1 -1 -1 1 ]
+    scale [ 1 1 0.01 0.01 ]
+  }
+}
diff --git a/examples/models/vrml/test/extrusion3.wrl b/examples/models/vrml/test/extrusion3.wrl
new file mode 100644
index 0000000000000000000000000000000000000000..4499968fda9d581a40452e6c00c779c22ff915c1
--- /dev/null
+++ b/examples/models/vrml/test/extrusion3.wrl
@@ -0,0 +1,53 @@
+#VRML V2.0 utf8
+# X3D-to-VRML-97 XSL translation autogenerated by X3dToVrml97.xslt
+# http://www.web3d.org/x3d/content/X3dToVrml97.xslt
+# Generated using XSLT processor: SAXON 9.1.0.2 from Saxonica
+
+# [X3D] VRML V3.0 utf8
+# PROFILE Immersive
+# [X3D] version=3.0
+# [X3D] noNamespaceSchemaLocation=http://www.web3d.org/specifications/x3d-3.0.xsd
+# [head]
+
+# META "title" "Figure15.15TwistedBar.x3d"
+# META "creator" "Figure 15.15, The VRML 2.0 Sourcebook, Copyright [1997] By Andrea L. Ames, David R. Nadeau, and John L. Moreland"
+# META "reference" "http://www.wiley.com/legacy/compbooks/vrml2sbk/ch15/15fig15.htm"
+# META "translator" "Don Brutzman"
+# META "created" "20 August 2000"
+# META "modified" "14 January 2010"
+# META "description" "A bar twisted using Y-axis, cross-section rotation at each spine coordinate."
+# META "identifier" "http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter15-Extrusion/Figure15.15TwistedBar.x3d"
+# META "generator" "X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"
+# META "license" "../../license.html"
+
+# [Scene] ========== ========== ==========
+
+NavigationInfo { type [ "EXAMINE" "ANY" ] } ###  Default X3D NavigationInfo
+
+# Computational cost of Extrusion compared to IndexedFaceSet: quicker to download, takes time to calculate polygonal faces and normals during initial loading, equally fast at run time.
+# Authoring capabilities of Extrusion compared to IndexedFaceSet: can be more complicated to express, but also can provide great detail with much less effort.
+# First position and rotate viewpoint into positive-X-Y-Z octant using a Transform
+Transform {
+  rotation 0 1 0 0.758
+  translation 10 5 10
+  children [
+      Viewpoint {
+        description "Twisted bar using extrusion orientations"
+        orientation 1 0 0 -0.3
+        position 0 0 0
+      }
+  ]
+}
+Shape {
+  appearance Appearance {
+    material Material {
+      diffuseColor 1 0.5 0
+    }
+  }
+  geometry Extrusion {
+    creaseAngle 0.785
+    crossSection [ -1 1 1 1 1 -1 -1 -1 -1 1 ]
+    orientation [ 0 1 0 0 0 1 0 0.175 0 1 0 0.349 0 1 0 0.524 0 1 0 0.698 0 1 0 0.873 0 1 0 1.047 0 1 0 1.222 0 1 0 1.396 ]
+    spine [ 0 0.0 0 0 0.5 0 0 1.0 0 0 1.5 0 0 2.0 0 0 2.5 0 0 3.0 0 0 3.5 0 0 4.0 0 ]
+  }
+}