How can I create individual geometries?

[pasc1377]

I would like to create my own geometries in MotorCAD. The geometries consist of lines and arcs. So far I have only worked with Maxwell. Is this also possible in MotorCAD?
I have found some information in the documentation, but my code does not produce any usable output. Can you help me?

`
import ansys.motorcad.core as pymotorcad
from ansys.motorcad.core.geometry import Arc, Coordinate, Line, rt_to_xy

if "QT_API" in os.environ:
os.environ["QT_API"] = "pyqt"

if pymotorcad.is_running_in_internal_scripting():
# Use existing Motor-CAD instance if possible
mc = pymotorcad.MotorCAD(open_new_instance=False)
else:
mc = pymotorcad.MotorCAD(keep_instance_open=True)
# Disable popup messages
mc.set_variable("MessageDisplayState", 2)
if not "PYMOTORCAD_DOCS_BUILD" in os.environ:
mc.set_visible(True)

l1 = Line(Coordinate(0, 0), Coordinate(30, 0))
l2 = Line(Coordinate(30, 0), Coordinate(30, 20))
l3 = Line(Coordinate(30, 20), Coordinate(0, 0))

arc_centre = Coordinate(10, 0)
arc_start = Coordinate(5, 0)
arc_end = Coordinate(10, 5)
new_arc = Arc(start=arc_start, end=arc_end, centre=arc_centre)

reg_rot = mc.get_region("Rotor")
print(reg_rot)
reg_rot.insert_entity(6, l1)

`

[ravi-ansys]

Hello
Yes, we can create custom parameterized geometries in Motor-CAD. I will recommend to follow the user guide https://motorcad.docs.pyansys.com/version/stable/user_guide/adaptive_templates.html
and Examples https://motorcad.docs.pyansys.com/version/stable/examples/adaptive_library/index.html

Once we have modified the region , we need to use set_region method to visualise the changes in Motor-CAD.
I hope this helps.

[pasc1377]

Thank you very much. I have already read the documentation, but I still can't understand how I can draw my own geometries from scratch. I don't want to change a template, but create everything from scratch. Can you help me with this?
As an example, I just wanted to draw a triangle. To do this, I created three lines and assigned them to a region. Unfortunately it does not work.

[JackB-Ansys]

Hi @pasc1377, Motor-CAD is an inherently template-based tool and you will likely run into many difficulties if you attempt to completely redraw the geometry from scratch. It is not recommended to try to redraw from scratch but to set up the Motor-CAD standard template as closely as possible to your design. This will then form an ideal starting point for any customisation you may wish to achieve with adaptive templates.

To create your triangular region from the 3 lines you have defined, make sure that you add the entities to the region in anti-clockwise order, going around the triangle. So in your example above, this would be l1, l2 then l3. A really useful tool is the draw_objects function (from ansys.motorcad.core.geometry_drawing import draw_objects). With this function you can draw the entities and regions you are working on and it is very helpful to be able to visualise things.

[pasc1377]

Thank you very much Jack! Now I have understood it. Are there plans to be able to add your own geometries in the future? Is it possible to view the source code for geometry creation somewhere and possibly access it to generate a geometry?
The draw_objects method is great. Thanks for the hint.