Python hwx library extrude-substract problem (Inspire 2025)

EnesKurt

In the Python hwx library, the “extrude” function is explained as in the image, but “parts” does not work correctly. For example, I wanted to do a Substract operation with the following line of code. In the code, I specified “parts=substractPart” in the function. Although Part(1) appears in the “Merge with” section of the extrude tool, it substracts all parts because the “All parts” option is still active in this section.

Code:

from hwx import inspire

# Extrude As Solid
model = inspire.newModel()
s = inspire.core.Sketch()
s.addRectangle2Vertex((0, 0), (2, 2))
s.realize()
sketch_part = model.getAllChildren('SketchPart')[0]inspire.geometry.extrude(sketch_part.getFeatures(type=inspire.FeatureArea),                         "SINGLE", "NEW_PART", extrudeTo1=0.1)
s = inspire.core.Sketch()
s.addCircleCenterRadius((1, 1), 0.3)
s.realize()
sketch_part = model.getAllChildren('SketchPart')[1]
sketch_part.position
p = model.parts[0]
faces = p.getFeatures('FeaturePlanar')
inspire.geometry.extrude(sketch_part.getFeatures(type=inspire.FeatureArea),                         "SINGLE", "SUBTRACT", extrudeTo1=faces[4])

# Extrude As Sheet
s = inspire.core.Sketch()
s.addRectangle2Vertex((0, 0), (2, 2))
s.realize()sketch_part = model.getAllChildren('SketchPart')[0]inspire.geometry.extrude(sketch_part.getFeatures(type=inspire.FeatureArea),                         "SYMMETRY", "NEW_PART", extrudeTo1=0.1, angle1=45, extrudeAsSolid=False,                         reference=(0, 0, 1), extrusionEndCaps="BOTH")

#Problem here !!!!!!!
cutSketch = model.getAllChildren('SketchPart')[-1]
substractPart = model.parts[-1]
inspire.geometry.extrude(cutSketch.getFeatures(type=inspire.FeatureArea),"SYMMETRY","SUBTRACT",extrudeTo1=0.2,parts=[substractPart])

inspire.orientView(direction="isometric")

Tool view:

Function:

SouravDas0306

Hi Enes,

In the current version of the hwx Python API for Altair Inspire, the extrude function’s parts parameter—which is intended to specify which parts the extrusion should merge or subtract from—does not work as expected. Even if you pass a specific part (like parts=[substractPart]), the extrusion operation still behaves as if the "All parts" option is active in the GUI, applying the subtraction to every part rather than just the one specified. This appears to be a limitation or bug in the API where the parts argument is not correctly restricting the scope of the Boolean operation during extrusion. Consequently, while the GUI shows the correct part listed in the "Merge with" section, the actual operation ignores this restriction. The only reliable workaround at this time is to manually perform the subtraction as a separate Boolean operation after creating the extrusion, or to carefully manage your model so that only the desired part exists at the time of extrusion. You may also consider reporting this behavior to Altair support for confirmation and potential fixes.

workflow:

1. Create your extrusion as a new part (without subtraction).
2. Perform a Boolean subtract operation explicitly between the extrusion and the target part.
3. Delete or hide the original extrusion if needed.

• The first extrusion creates the base geometry.

• The second extrusion creates the cutting geometry, but does not subtract yet.

• booleanSubtract explicitly subtracts subtract_part from extruded_part.

• Finally, the cutting part is deleted to clean up the model.

• This approach bypasses the issue where the extrude function’s parts parameter doesn’t restrict the subtraction correctly. It also gives you full control over the Boolean operation, ensuring only the intended parts are involved.

• Regards,

• Sourav

Script extrude .docx