Q3D sink creation from selection

[arifroni]

Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

Description of the bug

when i want to create a sink from an object, it works, to some extent. But when I use a face ID, it doesn't work.

when I want to specify axisdir, I expected I can define 6 faces of that object. but it only works on 4 faces. 0&1 are same, 3&4 are same. In the picture you can see, I couldn't create on to and bottom faces.

Steps To Reproduce

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Which Operating System are you using?

Windows

Which Python version are you using?

3.10

Installed packages

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[Samuelopez-ansys]

Hi @arifroni ,

An ID is an integer, and you are passing an string "FaceID148803", you just need to split the string and the number, and pass the number (148803).

In addition, you could use this method: sink the other methods will be deprecated (PyAEDT v0.8.9):

q3dapp.sink(assignment=148803)

[arifroni]

Thanks. Regarding the second problem, i couldnt make direction work in sink method.

But with assign_sink_to_objectface method, I realized if height is small compared to x and y size, it doesn't work (cant create sink on xy plane, top and bottom). for example:

for a box size of 1mm x 1mm x 5um, when i use

for i in range (6):
    q3dapp.assign_sink_to_objectface('Box5', direction=i, name="Axis="+str(i))

six sinks are created on all yz and xz planes.

but for a box size of 0.1mm x 0.1mm x 5um, it creates 6 sinks on all 6 faces.

[Samuelopez-ansys]

Sorry, I am not following you, what are you trying to do?

[arifroni]

I have 16 copper pads (rectangle box). i want to create 16 sinks on the bottom face of those boxes. My goal was to rename the boxes to meaningful name (Gate1, Gate2 ....Gate16). What I wanted was that, I will select the boxes in q3d and run the script. script will capture my selections (objs = q3dapp.modeler.selections). And then loop through and create sink on the bottom face.

for i in range(len(objs)):
    q3dapp.assign_sink_to_objectface(objs[i], direction=1, name=objs[i])

As I said before this works, as long as the thickness of the boxes are higher than what I have (my boxes are 5um thick).
To recreate the problem you can do the following:

Create two boxes (box1 and box2).
box1: 1mm x 1mm x 0.005mm
box2: 0.1mm x 0.1mm x 0.005mm

then run this:

for i in range (6):
    q3dapp.assign_sink_to_objectface('Box1', direction=i, name="Box1_Axis="+str(i))
    q3dapp.assign_sink_to_objectface('Box2', direction=i, name="Box1_Axis="+str(i))

you should see that box1 has 6 sinks on all the faces. But box2 has 6 sinks on 4 faces. My box size in the project is in the range of box1. Thats why i cant create sinks in my project. If i just increase my box heights to 7um from 5um, command works.

I hope its more clear now.

[Samuelopez-ansys]

@arifroni Why don't you get directly the bottom face? With PyAEDT is quite simple:

app = pyaedt.Q3d(specified_version="2024.1", new_desktop_session=False)

bot_face_b1 = app.modeler['Box1'].bottom_face_z

app.sink(bot_face_b1, name="Box1_Axis1")

bot_face_b2 = app.modeler['Box2'].bottom_face_z

app.sink(bot_face_b2, name="Box2_Axis")

app.release_desktop(False, False)

You can get all object faces just doing: app.modeler['Box1'].faces, and decide which one you want to assign the sink. In addition, PyAEDT gives you the bottom and top ones depending on the axis ( bottom_face_z), please let me know if this is what you need.

[Samuelopez-ansys]

@arifroni Any feedback?

[arifroni]

this works. But i noticed bottom_face_z gives me bottom Z face with respect to Global coordinate system. Is there any way to change that? Lets say i am working on "my_new_CS", which is rotated from Global. i want bottom face z with respect to "my_new_CS" instead of Global, is that possible.

[Samuelopez-ansys]

Hi @arifroni ,

No, the information provided app.modeler['Box2'].bottom_face_z is always refered to the Global. If you need it with any other coordinate system, create a new Issue, and the community will try to perform the implementation, or if you know how to do it, please you could aso contribute.

Thank you!