How to perform Blend with Guide Curves in PyAnsys Geometry?

I would like to create a single solid object in PyAnsys Geometry by smoothly connecting (blending) faces that have slightly different shapes.

In SpaceClaim, I typically achieve this by connecting the vertices of the faces with lines and using them as guides (guide curves) for the blend operation to create a solid object. Is it possible to perform this specific operation using PyAnsys Geometry?

Is my only option to execute a SpaceClaim script using run_discovery_script_file?
If so, is it possible to target and manipulate objects that already exist within an .scdox file? In other words, can I run the script (the blend process) via run_discovery_script_file to modify or append to the existing .scdox file?

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Ryoma

Hello @Hiroki ,

Unfortunately, currently the only methods available for creating solid body rom sketches are extrude and sweep. As an alternative, there is a method to create a surface body by connecting multiple curves (create_body_from_loft_profile).

Please use this to create a surface and then use it to create or split the desired solid.

Sample code:

from ansys.geometry.core import launch_modeler

from ansys.geometry.core.math import (

    Point3D,

    UNITVECTOR3D_X,

    UNITVECTOR3D_Y,

    UNITVECTOR3D_Z,

)

from ansys.geometry.core.shapes import Circle, Line, Interval

from ansys.geometry.core.misc import UNITS

import numpy as np


# Launch Ansys Geometry Modeler service

print("Launching Modeler...")

modeler = launch_modeler()


# Create a new design

design = modeler.create_design("LoftExample")


# Create profile (circular cross-section)

circle_curve = [Circle(Point3D([0, 0, 0]), 0.1).trim(Interval(0, np.pi))]  # 0.1 m radius

line_curve = [Line(Point3D([-0.1, 0, 0.1]),UNITVECTOR3D_X).trim(Interval(0, 0.2))]  # 0.1m length


# Extrude the circle

try:

    lofted_body = design.create_body_from_loft_profile("Loft_surface",

                                                       [circle_curve,line_curve])  

    print("Method 1 completed: Circular extrusion")

    lofted_body.plot()

except Exception as e:

    print(f"Error in Method 1: {e}")

Arcs and straight lines can also be converted to NURBS curves. For details, please see: The curves package — PyAnsys Geometry

To request the addition of Blend functionality for sketches, please file it as an Enhancement in the Issues section of this GitHub repository. Issues · ansys/pyansys-geometry

I'll answer your other question. After executing Discovery/SpaceClaim scripts, it is possible to import the resulting geometry as a design and perform further editing via PyAnsys-Geometry API. Please note that you must set import_design=True when executing run_discovery_script_file. The following is sample code.

from ansys.geometry.core import launch_modeler_with_discovery

from pathlib import Path


script_file = Path(Path(__file__).parent, "discovery_operation.py")  

modeler = launch_modeler_with_discovery(product_version=252,)

print(modeler)


# Run EDiscovery/SpaceClaim Script

_, design = modeler.run_discovery_script_file(script_file, import_design=True)


design.bodies[0].color = "red"

design.plot(use_service_colors=True)


# Create new body with extrusion

new_body=design.extrude_face(name="Extruded_Face",

                    face=design.bodies[0].faces[0],

                    distance=0.5,

                    direction="+")

new_body.color="blue"

design.plot(use_service_colors=True)

Hiroki

Dear Mr. Okamoto,

Thank you for your reply. I was able to create a surface using the Loft function.

My primary objective is to create a solid body by connecting these planar surfaces. However, when I use the Loft function with multiple line segments, the resulting side surfaces do not become planar .

I am attempting to create the planar surfaces first and then connect them to form a solid body, but I am unsure how to create a plane directly from line segments in PyAnsys.Is using sketch and design.extrude_sketch the only option? When I try this, I cannot seem to set the thickness to 0, which prevents me from creating a simple plane. I assumed that if the curves formed a closed loop, a plane would be generated automatically, but that is not happening.

Currently, I am manually solidifying the model in SpaceClaim using the "Missing Faces" or "Stitch" tools in the Repair tab, but I would like to achieve this entirely within PyAnsys.

I would appreciate any advice you could give me.

Best regards,

Hiroki

@Ryoma

Ryoma

Hello, @Hiroki,

I recommend carefully reviewing the following APIs to see if any of them closely match the operation you wish to perform.

Component — PyAnsys Geometry

My primary objective is to create a solid body by connecting these planar surfaces. However, when I use the Loft function with multiple line segments, the resulting side surfaces do not become planar .

Regarding this, you can add more control by replacing create_body_from_loft_profile to create_body_from_loft_profiles_with_guides when creating lofted surface. Please try this method instead.

I am attempting to create the planar surfaces first and then connect them to form a solid body, but I am unsure how to create a plane directly from line segments in PyAnsys.Is using sketch and design.extrude_sketch the only option? When I try this, I cannot seem to set the thickness to 0, which prevents me from creating a simple plane. I assumed that if the curves formed a closed loop, a plane would be generated automatically, but that is not happening.

You can use create_surface for this purpose. You can find actual use of this method in

Modeling: Design organization — PyAnsys Geometry

Currently, I am manually solidifying the model in SpaceClaim using the "Missing Faces" or "Stitch" tools in the Repair tab, but I would like to achieve this entirely within PyAnsys.

We have RepairTools — PyAnsys Geometry. I guess you would be better to refer to the find_and_fix_stitch_faces method.