2D meshing: xy cross-section#
You can supply the argument type="xy" and a z-value, to mesh arbitrary Component planar cross-sections.
import gdsfactory as gf
import meshio
from gdsfactory.generic_tech import get_generic_pdk
from gdsfactory.pdk import get_layer_stack
from gdsfactory.technology import LayerStack
from skfem.io import from_meshio
from gplugins.gmsh.get_mesh import create_physical_mesh, get_mesh
gf.config.rich_output()
PDK = get_generic_pdk()
PDK.activate()
waveguide = gf.components.straight_pin(length=10, taper=None)
waveguide.plot()
filtered_layer_stack = LayerStack(
layers={
k: get_layer_stack().layers[k]
for k in (
"slab90",
"core",
"via_contact",
)
}
)
filename = "mesh"
def mesh_with_physicals(mesh, filename):
mesh_from_file = meshio.read(f"{filename}.msh")
return create_physical_mesh(mesh_from_file, "triangle")
At z=0.09 um, according to the layer stack above we should see polygons from all three layers:
filename = "mesh"
mesh = get_mesh(
component=waveguide,
type="xy",
z=0.09,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
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Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.0104185s, CPU 0.021782s)
Info : Meshing 2D...
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Info : Done meshing 2D (Wall 0.0525766s, CPU 0.076901s)
Info : 2085 nodes 4556 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmpb0cnvia2/mesh.msh'...
Info : Done writing '/tmp/tmpb0cnvia2/mesh.msh'
[]
At z=0, you can see only the core and slab:
mesh = get_mesh(
component=waveguide,
type="xy",
z=0.0,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
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Info : [ 80%] Difference - Making faces
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Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.0147084s, CPU 0.043926s)
Info : Meshing 2D...
Info : Meshing surface 1 (Plane, Frontal-Delaunay)
Info : Done meshing 2D (Wall 0.0479875s, CPU 0.095968s)
Info : 1103 nodes 2208 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmpkcdoemkj/mesh.msh'...
Info : Done writing '/tmp/tmpkcdoemkj/mesh.msh'
Warning : Boolean fragments skipped - too few arguments
[]
At z=1.0, you can only see the vias appear:
mesh = get_mesh(
component=waveguide,
type="xy",
z=1.0,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
Info : [ 0%] Union
Info : [ 10%] Union - Performing intersection of shapes
Info : [ 80%] Union - Building splits of containers
Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.0276367s, CPU 0.086123s)
Info : Meshing 2D...
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Info : Done meshing 2D (Wall 0.0214411s, CPU 0.064236s)
Info : 384 nodes 832 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmptpjhm5q9/mesh.msh'...
Info : Done writing '/tmp/tmptpjhm5q9/mesh.msh'
[]
Controlling meshing domain#
You can use functions that return other components to modify the simulation domain, for instance gdsfactory.geometry.trim:
waveguide_trimmed = gf.Component()
waveguide_trimmed.add_ref(
gf.geometry.trim(
component=waveguide,
domain=[[3, -4], [3, 4], [5, 4], [5, -4]],
)
)
waveguide_trimmed.plot()
2024-05-10 10:29:16.209 | WARNING | gdsfactory.component:plot_klayout:1645 - UserWarning: Unnamed cells, 1 in 'Unnamed_17e60e4a'
mesh = get_mesh(
component=waveguide_trimmed,
type="xy",
z=0.09,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
Info : [ 0%] Union
Info : [ 10%] Union - Performing intersection of shapes
Info : [ 80%] Union - Building splits of containers
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Info : [ 90%] Difference - Adding holes
Info : [ 0%] Fragments
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Info : [ 80%] Fragments - Splitting faces
Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.0133348s, CPU 0.041568s)
Info : Meshing 2D...
Info : [ 0%] Meshing surface 2 (Plane, Frontal-Delaunay)
Info : [ 0%] Meshing surface 3 (Plane, Frontal-Delaunay)
Info : [ 0%] Meshing surface 1 (Plane, Frontal-Delaunay)
Info : Done meshing 2D (Wall 0.00358984s, CPU 0.012982s)
Info : 125 nodes 276 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmpais55khk/mesh.msh'...
Info : Done writing '/tmp/tmpais55khk/mesh.msh'
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