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# Copyright (c) 2018-2022, Manfred Moitzi
# License: MIT License
import math
import pathlib
import ezdxf
from ezdxf.render import forms, MeshBuilder
from itertools import cycle
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to create 3D forms.
#
# docs:
# forms: https://ezdxf.mozman.at/docs/render/forms.html
# MeshBuilder: https://ezdxf.mozman.at/docs/render/mesh.html
# ------------------------------------------------------------------------------
def write_mesh(filename, mesh: MeshBuilder):
"""Write MeshBuilder object as a MESH entity."""
doc = ezdxf.new("R2000")
# MESH can represent ngons, no tessellation is applied:
mesh.render_mesh(doc.modelspace())
try:
doc.saveas(filename)
except IOError as e:
print(str(e))
else:
print(f'saving as "{filename}" MESH: done')
def write_polyface(filename, mesh: MeshBuilder):
"""Write MeshBuilder object as a POLYFACE entity a subtype of POLYLINE."""
doc = ezdxf.new("R2000")
# POLYFACE can only represent triangles or quads, the required
# tessellation of the mesh is done automatically:
mesh.render_polyface(doc.modelspace())
try:
doc.saveas(filename)
except IOError as e:
print(str(e))
else:
print(f'saving as "{filename}" POLYFACE: done')
def write_3dfaces(filename, mesh: MeshBuilder):
"""Write MeshBuilder object as single 3DFACE entities."""
doc = ezdxf.new("R2000")
# 3DFACE can only represent triangles or quads, the required
# tessellation of the mesh is done automatically:
mesh.render_3dfaces(doc.modelspace())
try:
doc.saveas(filename)
except IOError as e:
print(str(e))
else:
print(f'saving as "{filename}" 3DFACES: done')
def build_rotation_form(alpha=2 * math.pi, sides=16):
profile = forms.spline_interpolation(
[(0, 0.1), (1, 1), (3, 1.5), (5, 3)], subdivide=8
) # in xy-plane
return forms.rotation_form(sides, profile, angle=alpha, axis=(1, 0, 0))
def create_gear(
filename, teeth=20, outside_radius=10, top_width=2, bottom_width=3, height=2
):
doc = ezdxf.new("R2000")
msp = doc.modelspace()
vertices = zip(
forms.gear(
count=teeth,
top_width=top_width,
bottom_width=bottom_width,
height=height,
outside_radius=outside_radius,
),
cycle(
[0, 0.1, 0, 0.1]
), # bulge values: top, down flank, bottom, up flank
)
msp.add_lwpolyline(
vertices,
format="vb",
close=True,
)
doc.saveas(filename)
def main():
cylinder = forms.cylinder(16)
write_mesh(CWD / "cylinder_mesh.dxf", cylinder)
write_polyface(CWD / "cylinder_polyface.dxf", cylinder)
write_3dfaces(CWD / "cylinder_3dfaces.dxf", cylinder)
rotation_form = build_rotation_form(sides=32)
write_mesh(CWD / "rotated_profile_mesh.dxf", rotation_form)
write_polyface(CWD / "rotated_profile_polyface.dxf", rotation_form)
write_3dfaces(CWD / "rotated_profile_3dfaces.dxf", rotation_form)
create_gear(CWD / "gear.dxf")
if __name__ == "__main__":
main()
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