Reworked the core examples to exclude contributed examples.

examples/Ex015_Rotated_Workplanes.py

@@ -0,0 +1,22 @@
+import cadquery as cq
+
+# 1.  Establishes a workplane that an object can be built on.
+# 1a. Uses the named plane orientation "front" to define the workplane, meaning
+#     that the positive Z direction is "up", and the negative Z direction
+#     is "down".
+# 2.  Creates a plain box to base future geometry on with the box() function.
+# 3.  Selects the top-most Z face of the box.
+# 4.  Creates a new workplane and then moves and rotates it with the
+#     transformed function.
+# 5.  Creates a for-construction rectangle that only exists to use for placing
+#     other geometry.
+# 6.  Selects the vertices of the for-construction rectangle.
+# 7.  Places holes at the center of each selected vertex.
+# 7a. Since the workplane is rotated, this results in angled holes in the face.
+result = cq.Workplane("front").box(4.0, 4.0, 0.25).faces(">Z") \
+                 .workplane() \
+                 .transformed(offset=(0, -1.5, 1.0), rotate=(60, 0, 0)) \
+                 .rect(1.5, 1.5, forConstruction=True).vertices().hole(0.25)
+
+# Displays the result of this script
+show_object(result)