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build123d/docs/tutorial_general.rst
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add 5 new examples to general tutorials 
Also make some changes based on community feedback.
2023-01-09 14:24:13 -06:00

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#################
General Tutorials
#################
The examples on this page can help you learn how to build objects with Build123d, and are intended as a general overview of Build123d.
They are organized from simple to complex, so working through them in order is the best way to absorb them.
.. note::
Some important lines are omitted below to save space, so you will most likely need to add 1 & 2 to the provided code below for them to work:
1. ``from build123d import *``
2. If you are using CQ-editor add the line e.g. ``show_object(ex15.part)`` at the end. Other viewers may have different commands to view the object.
3. Similarly, you can use e.g. ``show_object(ex15.sketch)`` and ``show_object(ex15.line)`` to view sketches and lines respectively.
4. If you want to save your resulting file from CQ-editor as an STL, it is currently best to use e.g. ``show_object(ex15.part.wrapped)``.
.. contents:: List of Examples
:backlinks: entry
1. Simple Rectangular Plate
---------------------------------------------------
Just about the simplest possible example, a rectangular box
.. image:: assets/general_ex1.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 1]
:end-before: [Ex. 1]
2. Plate with Hole
---------------------------------------------------
A rectangular box, but with a hole added. In this case we are using ``Mode.SUBTRACT`` to cut the Cylinder from the Box.
.. image:: assets/general_ex2.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 2]
:end-before: [Ex. 2]
3. An extruded prismatic solid
---------------------------------------------------
Build a prismatic solid using extrusion. This time we can first create a 2D ``BuildSketch`` with a
subtracted Rectangle and then use BuildPart's ``Extrude`` feature.
.. image:: assets/general_ex3.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 3]
:end-before: [Ex. 3]
4. Building Profiles using lines and arcs
---------------------------------------------------
Sometimes you need to build complex profiles using lines and arcs. This example builds a prismatic
solid from 2D operations. It is not necessary to create variables for the line segments, but it will be useful in a later example.
.. image:: assets/general_ex4.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 4]
:end-before: [Ex. 4]
5. Moving the current working point
---------------------------------------------------
Using ``Locations`` we can place one (or multiple) objects at one (or multiple) places.
.. image:: assets/general_ex5.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 5]
:end-before: [Ex. 5]
6. Using Point Lists
---------------------------------------------------
Sometimes you need to create a number of features at various locations. You can use a list of
points to construct multiple objects at once.
.. image:: assets/general_ex6.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 6]
:end-before: [Ex. 6]
7. Polygons
---------------------------------------------------
You can create regular polygons for each stack point if you would like.
.. image:: assets/general_ex7.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 7]
:end-before: [Ex. 7]
8. Polylines
---------------------------------------------------
``Polyline`` allows creating a shape from a large number of chained points connected by
lines. This example uses a polyline to create one half of an i-beam shape, which is mirrored to create the final profile.
.. image:: assets/general_ex8.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 8]
:end-before: [Ex. 8]
9. Selectors, Fillets, and Chamfers
---------------------------------------------------
This example introduces multiple useful and important concepts. Firstly ``Chamfer``
and ``Fillet`` can be used to "bevel" and "round" edges respectively.
Secondly, these two methods require an edge or a list of edges to operate on. To
select all edges, you could simply pass-in ``*ex9.edges()``. Note that the star (\*) unpacks the list.
``group_by(Axis.Z)`` returns a list of lists that is grouped by their z-position.
In this case we want to use the ``[-1]`` group which, by convention, will be the highest z-dimension group.
.. image:: assets/general_ex9.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 9]
:end-before: [Ex. 9]
10. Select Last and Hole
---------------------------------------------------
Using ``Select.LAST`` you can select the most recently modified edges. It is used to perform a ``Fillet`` in
this example. This example also makes use of ``Hole`` which automatically cuts through the entire part.
.. image:: assets/general_ex10.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 10]
:end-before: [Ex. 10]
11. Use a face as a plane for BuildSketch and introduce GridLocations
----------------------------------------------------------------------------
``BuildSketch`` accepts a Plane or a Face, so in this case we locate the Sketch on the top of the part.
Additionally ``GridLocations`` can be used to create a grid of points that are simultaneously used to place 4 pentagons.
Lastly, ``Extrude`` can be used with a negative amount and Mode.SUBTRACT to cut these from the parent.
.. image:: assets/general_ex11.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 11]
:end-before: [Ex. 11]
12. Defining an Edge with a Spline
---------------------------------------------------
This example defines a side using a spline curve through a collection of points. Useful when you have an
edge that needs a complex profile.
The star (\*) operator is again used to unpack the list.
.. image:: assets/general_ex12.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 12]
:end-before: [Ex. 12]
13. CounterBoreHoles, CounterSinkHoles and PolarLocations
-------------------------------------------------------------
We use a face to establish a location for ``Workplanes``. ``PolarLocations`` creates a list of
points that are radially distributed.
Counter-sink and counter-bore holes are useful for creating recessed areas for fasteners.
.. image:: assets/general_ex13.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 13]
:end-before: [Ex. 13]
14. Position on a line with '\@', '\%' and introduce Sweep
------------------------------------------------------------
Build123d includes a feature for finding the position along a line segment. This is normalized
between 0 and 1 and can be accessed using the '\@' operator.
Similarly the '%' operator returns the line direction at a given point.
These two features are very powerful for chaining line segments together without having to repeat
dimensions again and again, which is error prone, time consuming, and more difficult to maintain.
It is also possible to use ``Vector`` addition (and other vector math operations) as seen in
the ``l3`` variable.
The Sweep method takes any pending faces and sweeps them through the provided path. It requires a
single connected wire.
.. image:: assets/general_ex14.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 14]
:end-before: [Ex. 14]
15. Mirroring Symmetric Geometry
---------------------------------------------------
Here mirror is used on the BuildLine to create a symmetric shape with fewer line segment commands.
Additionally the '@' operator is used to simplify the line segment commands.
``(l4 @ 1).Y`` is used to extract the y-component of the ``l4 @ 1`` vector.
.. image:: assets/general_ex15.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 15]
:end-before: [Ex. 15]
16. Mirroring 3D Objects
---------------------------------------------------
Mirror can also be used with BuildPart (and BuildSketch) to mirror 3D objects. The ``Plane.offset()``
method shifts the plane in the normal direction (+ve or -ve).
.. image:: assets/general_ex16.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 16]
:end-before: [Ex. 16]
17. Mirroring From Faces
---------------------------------------------------
Here we select the farthest face in the Y-direction and turn it into a ``Plane`` using the
``Plane()`` class.
.. image:: assets/general_ex17.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 17]
:end-before: [Ex. 17]
18. Creating Workplanes on Faces
---------------------------------------------------
Here we start with an earlier example, select the top face, draw a rectangle and then use Extrude
with a negative distance and Mode.SUBTRACT to cut it out from the main body.
.. image:: assets/general_ex18.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 18]
:end-before: [Ex. 18]
19. Locating a Workplane on a vertex
---------------------------------------------------
Here a face is selected and passed to ``Workplanes``, then the X and Y positions of a vertex are selected
and passed to ``Locations`` as the center point for a ``BuldSketch`` which is used to place a circle that
cuts through the main part. Note that if you passed the variable ``vtx`` directly to ``Locations`` then
the part would be offset from the Workplane by the vertex z-position. The ``sort_by(Axis.X and Axis.Y)``
first sorts by Axis.X and then by Axis.Y.
.. image:: assets/general_ex19.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 19]
:end-before: [Ex. 19]
20. Offset Sketch Workplane
---------------------------------------------------
The ``pln`` variable is set to be coincident with the farthest face in the negative x-direction.
.. image:: assets/general_ex20.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 20]
:end-before: [Ex. 20]
21. Create a Workplanes in the center of another shape
-------------------------------------------------------
One cylinder is created, and then the origin and z_dir of that part are used to create a new Plane for
positioning another cylinder perpendicular and halfway along the first.
.. image:: assets/general_ex21.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 21]
:end-before: [Ex. 21]
22. Rotated Workplanes
---------------------------------------------------
It is also possible to create a rotated workplane, building upon some of the concepts in an earlier
example with the ``rotated()`` method.
GridLocations places 4 Circles on 4 points on this rotated workplane, and then the Circles are
extruded in the "both" (+ve and -ve) normal direction.
.. image:: assets/general_ex22.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 22]
:end-before: [Ex. 22]
23. Revolve
---------------------------------------------------
Here we build a sketch with a Polyline, Line, and a Circle. It is absolutely critical that the sketch
is only on one side of the axis of rotation before Revolve is called.
To that end, Split is used with Plane.ZY to keep only one side of the Sketch.
It is highly recommended to view your sketch before you attempt to call revolve. In CQ-editor this
can be accomplished e.g. like this: ``show_object(ex23_sk.sketch)``.
.. image:: assets/general_ex23.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 23]
:end-before: [Ex. 23]
24. Loft
---------------------------------------------------
Loft is a very powerful tool that can be used to join dissimilar shapes. In this case we make a
conical-like shape from a rectangle and a circle.
.. image:: assets/general_ex24.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 24]
:end-before: [Ex. 24]
25. Offset Sketch
---------------------------------------------------
BuildSketch faces can be transformed with a 2D ``Offset``. They can be offset inwards or outwards,
and with different techniques for extending the corners (see ``kind`` in the Offset docs).
.. image:: assets/general_ex25.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 25]
:end-before: [Ex. 25]
26. Offset Part To Create Thin features
---------------------------------------------------
BuildPart parts can also be transformed using an offset, but in this case with a 3D ``Offset``. Also
commonly known as a shell, this allows creating thin walls using very few operations. This can also be
offset inwards or outwards. Faces can be selected to be "deleted" using the ``openings`` parameter of ``Offset``.
.. image:: assets/general_ex26.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 26]
:end-before: [Ex. 26]
27. Splitting an Object
---------------------------------------------------
You can split an object using a plane, and retain either or both halves. In this case we select
a face and offset half the width of the box.
.. image:: assets/general_ex27.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 27]
:end-before: [Ex. 27]
28. Locating features based on Faces
---------------------------------------------------
We create a triangular prism with ``Mode.PRIVATE`` and then later use the faces of this object to
cut holes in a sphere. We are able to create multiple Workplanes at the same time by unpacking the
list of faces.
.. image:: assets/general_ex28.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 28]
:end-before: [Ex. 28]
29. The Classic OCC Bottle
---------------------------------------------------
Build123d is based on the OpenCascade.org (OCC) modeling Kernel. Those who are familiar with OCC
know about the famous ‘bottle’ example. We use a 3D Offset and the openings parameter to create
the bottle opening.
.. image:: assets/general_ex29.svg
:align: center
.. literalinclude:: general_examples.py
:start-after: [Ex. 29]
:end-before: [Ex. 29]
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