General: coordinate system creation#

This example shows how you can use PyAEDT to create and modify coordinate systems in the modeler.

Perform required imports#

Perform required imports

import os

from pyaedt import Hfss
from pyaedt import Desktop
from pyaedt import generate_unique_project_name

Set non-graphical mode#

Set non-graphical mode. "PYAEDT_NON_GRAPHICAL" is needed to generate documentation only. You can set non_graphical either to True or False.

non_graphical = os.getenv("PYAEDT_NON_GRAPHICAL", "False").lower() in ("true", "1", "t")

Launch AEDT in graphical mode#

Launch AEDT 2022 R2 in graphical mode.

d = Desktop("2022.2", non_graphical=non_graphical, new_desktop_session=True)

Insert HFSS design#

Insert an HFSS design with the default name.

hfss = Hfss(projectname=generate_unique_project_name(folder_name="CoordSysDemo"))

Create coordinate system#

The coordinate system is centered on the global origin and has the axis aligned to the global coordinate system. The new coordinate system is saved in the object cs1.

cs1 = hfss.modeler.create_coordinate_system()

Modify coordinate system#

The cs1 object exposes properties and methods to manipulate the coordinate system. The origin can be changed.

cs1["OriginX"] = 10
cs1.props["OriginY"] = 10
cs1.props["OriginZ"] = 10

# Pointing vectors can be changed

ypoint = [0, -1, 0]
cs1.props["YAxisXvec"] = ypoint[0]
cs1.props["YAxisYvec"] = ypoint[1]
cs1.props["YAxisZvec"] = ypoint[2]

Rename coordinate system#

Rename the coordinate system.


Change coordinate system mode#

Use the change_cs_mode method to change the mode. Options are 0 for axis/position, 1 for Euler angle ZXZ, and 2 for Euler angle ZYZ. Here 1 sets Euler angle ZXZ as the mode.


# In the new mode, these properties can be edited
cs1.props["Phi"] = "10deg"
cs1.props["Theta"] = "22deg"
cs1.props["Psi"] = "30deg"

Delete coordinate system#

Delete the coordinate system.


Create coordinate system by defining axes#

Create a coordinate system by defining the axes. During creation, you can specify all coordinate system properties.

cs2 = hfss.modeler.create_coordinate_system(
    name="CS2", origin=[1, 2, 3.5], mode="axis", x_pointing=[1, 0, 1], y_pointing=[0, -1, 0]

Create coordinate system by defining Euler angles#

Create a coordinate system by defining Euler angles.

cs3 = hfss.modeler.create_coordinate_system(name="CS3", origin=[2, 2, 2], mode="zyz", phi=10, theta=20, psi=30)

Create coordinate system by defining view#

Create a coordinate system by defining the view. Options are "iso", "XY", "XZ", and "XY". Here "iso" is specified. The axes are set automatically.

cs4 = hfss.modeler.create_coordinate_system(name="CS4", origin=[1, 0, 0], reference_cs="CS3", mode="view", view="iso")

Create coordinate system by defining axis and angle rotation#

Create a coordinate system by defining the axis and angle rotation. When you specify the axis and angle rotation, this data is automatically translated to Euler angles.

cs5 = hfss.modeler.create_coordinate_system(name="CS5", mode="axisrotation", u=[1, 0, 0], theta=123)

Create face coordinate system#

Face coordinate systems are bound to an object face. First create a box and then define the face coordinate system on one of its faces. To create the reference face for the face coordinate system, you must specify starting and ending points for the axis.

box = hfss.modeler.create_box([0, 0, 0], [2, 2, 2])
face = box.faces[0]
fcs1 = hfss.modeler.create_face_coordinate_system(
    face=face, origin=face.edges[0], axis_position=face.edges[1], name="FCS1"

Create face coordinate system centered on face#

Create a face coordinate system centered on the face with the X axis pointing to the edge vertex.

fcs2 = hfss.modeler.create_face_coordinate_system(
    face=face, origin=face, axis_position=face.edges[0].vertices[0], name="FCS2"

Swap X and Y axes of face coordinate system#

Swap the X axis and Y axis of the face coordinate system. The X axis is the pointing axis_position by default. You can optionally select the Y axis.

fcs3 = hfss.modeler.create_face_coordinate_system(face=face, origin=face, axis_position=face.edges[0], axis="Y")

# Axis can also be changed after coordinate system creation
fcs3.props["WhichAxis"] = "X"

Apply a rotation around Z axis#

Apply a rotation around the Z axis. The Z axis of a face coordinate system is always orthogonal to the face. A rotation can be applied at definition. Rotation is expressed in degrees.

fcs4 = hfss.modeler.create_face_coordinate_system(face=face, origin=face, axis_position=face.edges[1], rotation=10.3)

# Rotation can also be changed after coordinate system creation
fcs4.props["ZRotationAngle"] = "3deg"

Apply offset to X and Y axes of face coordinate system#

Apply an offset to the X axis and Y axis of a face coordinate system. The offset is in respect to the face coordinate system itself.

fcs5 = hfss.modeler.create_face_coordinate_system(
    face=face, origin=face, axis_position=face.edges[2], offset=[0.5, 0.3]

# The offset can also be changed after the coordinate system is created.
fcs5.props["XOffset"] = "0.2mm"
fcs5.props["YOffset"] = "0.1mm"

Create coordinate system relative to face coordinate system#

Create a coordinate system relative to a face coordinate system. Coordinate systems and face coordinate systems interact with each other.

face = box.faces[1]
fcs6 = hfss.modeler.create_face_coordinate_system(face=face, origin=face, axis_position=face.edges[0])
cs_fcs = hfss.modeler.create_coordinate_system(
    name="CS_FCS", origin=[0, 0, 0],, mode="view", view="iso"

Get all coordinate systems#

Get all coordinate systems.

css = hfss.modeler.coordinate_systems
names = [ for i in css]
['CS_FCS', 'Face_CS_NBKS5Y', 'Face_CS_B56X54', 'Face_CS_8NNYTV', 'Face_CS_I6JQDG', 'FCS2', 'FCS1', 'CS5', 'CS4', 'CS3', 'CS2']

Select coordinate system#

Select an existing coordinate system.

css = hfss.modeler.coordinate_systems
cs_selected = css[0]

Get point coordinate under another coordinate system#

Get a point coordinate under another coordinate system. A point coordinate can be translated in respect to any coordinate system.

hfss.modeler.create_box([-10, -10, -10], [20, 20, 20], "Box1")
p = hfss.modeler["Box1"].faces[0].vertices[0].position
print("Global: ", p)
p2 = hfss.modeler.global_to_cs(p, "CS5")
print("CS5 :", p2)
Global:  [10.0, -10.0, 10.0]
CS5 : [10.000000000000082, 13.833096029604473, 2.9403153293038775]

Close AEDT#

After the simulaton completes, you can close AEDT or release it using the pyaedt.Desktop.release_desktop() method. All methods provide for saving the project before closing.

if != "posix":

Total running time of the script: ( 0 minutes 21.408 seconds)

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