ipkiss 3.12版加入write_obj函数，可以直接输出器件的三维模型。
如，输出自定义的mmi的三维模型：
代码如下：
from si_fab import all as pdk
from ipkiss3 import all as i3
class MMI1x2(i3.PCell):
"""MMI with 1 input and 2 outputs."""
_name_prefix = "MMI1x2"
trace_template = i3.TraceTemplateProperty(doc="Trace template of the access waveguide")
width = i3.PositiveNumberProperty(default=4.0, doc="Width of the MMI section.")
length = i3.PositiveNumberProperty(default=20.0, doc="Length of the MMI secion.")
taper_width = i3.PositiveNumberProperty(default=1.0, doc="Width of the taper.")
taper_length = i3.PositiveNumberProperty(default=5.0, doc="Length of the taper")
waveguide_spacing = i3.PositiveNumberProperty(default=2.0, doc="Spacing between the waveguides.")
def _default_trace_template(self):
return pdk.SiWireWaveguideTemplate()
class Layout(i3.LayoutView):
def _generate_elements(self, elems):
length = self.length
width = self.width
taper_length = self.taper_length
taper_width = self.taper_width
half_waveguide_spacing = 0.5 * self.waveguide_spacing
core_layer = self.trace_template.core_layer
cladding_layer = self.trace_template.cladding_layer
core_width = self.trace_template.core_width
# Si core
elems += i3.Rectangle(
layer=core_layer,
center=(0.5 * length, 0.0),
box_size=(length, width),
)
elems += i3.Wedge(
layer=core_layer,
begin_coord=(-taper_length, 0.0),
end_coord=(0.0, 0.0),
begin_width=core_width,
end_width=taper_width,
)
elems += i3.Wedge(
layer=core_layer,
begin_coord=(length, half_waveguide_spacing),
end_coord=(length + taper_length, half_waveguide_spacing),
begin_width=taper_width,
end_width=core_width,
)
elems += i3.Wedge(
layer=core_layer,
begin_coord=(length, -half_waveguide_spacing),
end_coord=(length + taper_length, -half_waveguide_spacing),
begin_width=taper_width,
end_width=core_width,
)
# Cladding
elems += i3.Rectangle(
layer=cladding_layer,
center=(0.5 * length, 0.0),
box_size=(length + 2 * taper_length, width + 2.0),
)
return elems
def _generate_ports(self, ports):
length = self.length
taper_length = self.taper_length
trace_template = self.trace_template
half_waveguide_spacing = 0.5 * self.waveguide_spacing
ports += i3.OpticalPort(
name="in1",
position=(-taper_length, 0.0),
angle=180.0,
trace_template=trace_template,
)
ports += i3.OpticalPort(
name="out1",
position=(length + taper_length, -half_waveguide_spacing),
angle=0.0,
trace_template=trace_template,
)
ports += i3.OpticalPort(
name="out2",
position=(length + taper_length, half_waveguide_spacing),
angle=0.0,
trace_template=trace_template,
)
return ports
class Netlist(i3.NetlistFromLayout):
pass
if __name__ == '__main__':
mmi_layout = MMI1x2().Layout()
mmi_layout.visualize(annotate=True)
mmi_geometry = i3.device_sim.SimulationGeometry(
layout=mmi_layout,
process_flow=i3.TECH.VFABRICATION.PROCESS_FLOW,
)
mmi_geometry.write_obj(filename="mmi.obj")
输出三维模型部分的代码：
mmi_geometry = i3.device_sim.SimulationGeometry(
layout=mmi_layout,
process_flow=i3.TECH.VFABRICATION.PROCESS_FLOW,
)
mmi_geometry.write_obj(filename="mmi.obj")
生成的obj文件可以用Mayo打开。