Geometry from CAD#

This example demonstrates loading Geometry and CompoundGeometry objects from .dxf and .3dm (rhino) files.

Import Modules#

We start by importing the necessary modules.

[1]:

from sectionproperties.analysis import Section
from sectionproperties.pre import CompoundGeometry, Geometry

Load from .dxf#

Geometry object#

We can load a single region from a .dxf file by using the Geometry.from_dxf() method.

[2]:

geom = Geometry.from_dxf(dxf_filepath="../../_static/cad_files/box_section.dxf")

To display the section, we mesh the geometry and plot the mesh.

[3]:

geom.create_mesh(mesh_sizes=[0.5])
Section(geometry=geom).plot_mesh(materials=False)
../../_images/examples_geometry_geometry_cad_7_0.svg
[3]:

<Axes: title={'center': 'Finite Element Mesh'}>

Note that loading multiple regions from a .dxf file is not currently supported. A possible work around could involve saving each region as a separate .dxf file, importing each region individually using Geometry.from_dxf(), then combining the regions using the + operator.

Load from .3dm#

Geometry object#

We can load a single region from a .3dm file by using the Geometry.from_3dm() method.

[4]:

geom = Geometry.from_3dm(filepath="../../_static/cad_files/rhino.3dm")
geom = geom.rotate_section(angle=90)  # rotate for viewability

To display the section, we mesh the geometry and plot the mesh.

[5]:

geom.create_mesh(mesh_sizes=[0.005])
Section(geometry=geom).plot_mesh(materials=False)
../../_images/examples_geometry_geometry_cad_13_0.svg
[5]:

<Axes: title={'center': 'Finite Element Mesh'}>

CompoundGeometry object#

We can load multiple regions from a .3dm file by using the CompoundGeometry.from_3dm() method.

[6]:

geom = CompoundGeometry.from_3dm(filepath="../../_static/cad_files/rhino_compound.3dm")
geom = geom.rotate_section(angle=90)  # rotate for viewability

To display the section, we mesh the geometry and plot the mesh.

[7]:

geom.create_mesh(mesh_sizes=[0.005])
Section(geometry=geom).plot_mesh(materials=False)
../../_images/examples_geometry_geometry_cad_17_0.svg
[7]:

<Axes: title={'center': 'Finite Element Mesh'}>