alg2d = NetgenAlgo2D(gen) hyp2d_1 = NetgenSimple2D(gen, 1.) hyp2d_2 = NetgenSimple2D(gen, 1., allow_quads=False) alg1d = Regular1D(gen) hyp1d = MaxLength1D(gen, 0.25) # Add them to the mesh mesh.add_hypotheses([alg2d, hyp2d_1]) mesh.add_hypothesis(hyp2d_2, faces[-1]) mesh.add_hypotheses([alg1d, hyp1d], edges[-1]) # Compute the mesh gen.compute(mesh) # View the mesh gui = Viewer() gui.add(mesh) gui.start() gui.clear() # Get sub-meshes from sub-shapes. Note that extracting the nodes and elements # from a shape is better done with groups. face_submesh = mesh.get_submesh(faces[0]) edge_submesh = mesh.get_submesh(edges[0]) # View the face sub-mesh (2-D elements) gui.add(face_submesh) gui.start() gui.clear() # View the edge sub-mesh (1-D elements)
# Build a reference surface using chord lines of the cross sections. Make sure # to use the same scaling and rotation parameters. Set the parametric domains # to be between 0 and 1 for convenience. chord1 = cs.build_chord(pln1, scale=c1) chord2 = cs.build_chord(pln2, scale=c2) chord3 = cs.build_chord(pln3, scale=c3, rotate=t3) sref = NurbsSurfaceByInterp([chord1, chord2, chord3], 1).surface sref.set_udomain(0., 1.) sref.set_vdomain(0., 1.) # Set the wing reference surface wing.set_sref(sref) # Show wing and reference surface gui = Viewer() gui.add(wing, wing.sref) gui.start() # Show the underlying shape of the reference surface gui.clear() gui.add(wing.sref_shape) gui.start() # Evaluate point p = wing.sref.eval(0.5, 0.5) # Extract a plane pln = wing.extract_plane(0.5, 0., 0.5, 0.5) face = FaceByPlane(pln, -10, 10, -10, 10).face
alg1d = Regular1D(the_gen) edges = the_shape.edges cmp = CompoundByShapes(edges).compound the_mesh.add_hypothesis(hyp1d, cmp) the_mesh.add_hypothesis(alg1d, cmp) # Unstructured quad-dominant hyp2d = NetgenSimple2D(the_gen, 4.) alg2d = NetgenAlgo2D(the_gen) the_mesh.add_hypothesis(hyp2d, the_shape) the_mesh.add_hypothesis(alg2d, the_shape) # Apply mapped quadrangle to internal structure # mapped_hyp = QuadrangleHypo2D(the_gen) # mapped_alg = QuadrangleAlgo2D(the_gen) # for part_ in internal_parts + [skin]: # for face in part_.faces: # if mapped_alg.is_applicable(face, True): # the_mesh.add_hypothesis(mapped_hyp, face) # the_mesh.add_hypothesis(mapped_alg, face) the_gen.compute(the_mesh, the_shape) # View # skin.set_transparency(0.5) v = Viewer() v.add(wingbox) v.start() v.add(the_mesh) v.start()
skin.fuse(*parts)
skin.discard_by_dmin(htail.sref_shape, 1.)
skin.fix()
skin.set_transparency(0.5)
# JOIN
start = time.time()
print('Performing assembly join...')
bop = FuseGroups([wing_group, fuse_group, htail_group])
print('Joining complete in ', time.time() - start, ' seconds.')
shape = bop.shape
tool = ExploreFreeEdges(shape)
parts = GroupAPI.get_master().get_parts()
# Mesh
the_mesh = MeshVehicle(4.)
mesh_start = time.time()
print('Computing mesh...')
status = the_mesh.compute()
if not status:
print('Failed to compute mesh')
else:
print('Meshing complete in ', time.time() - mesh_start, ' seconds.')
gui = Viewer()
gui.add(*tool.free_edges)
gui.add(the_mesh)
gui.start()
30,
fspar.shape,
rspar.shape,
wing,
d1=30,
d2=-30)
internal_parts = wingbox.get_parts()
skin = SkinByBody('skin', wing).part
cref = wing.sref.u_iso(0.5)
skin.discard_by_dmin(cref, 1.0)
FuseSurfaceParts([skin], internal_parts)
group = GroupAPI.get_master()
v = Viewer()
v.add(group)
v.start()
# Save
print('\nSaving group...')
GroupAPI.save_model('structure.xbf')
print('done.\n')
# Load into new group
print('Loading group...')
new_group = GroupAPI.create_group('new model')
GroupAPI.load_model('structure.xbf', new_group)
print('done.')
v.clear()
v.add(new_group)
solid = SweepShape(cref1, face).shape
CutParts(ribs, solid)
# Wing skin
skin = SkinByBody('skin', wing).part
skin.set_color(0.5, 0.5, 0.5)
skin.set_transparency(0.5)
# Discard end caps of skin
skin.discard_by_dmin(cref1, 0.5)
# Join all the parts
parts = GroupAPI.get_parts()
SplitParts(parts)
gui = Viewer()
gui.add(*parts)
gui.start()
# Mesh
print('Computing the mesh...')
the_shape = GroupAPI.prepare_shape_to_mesh()
the_gen = MeshGen()
the_mesh = MeshGen.create_mesh(the_gen)
the_mesh.shape_to_mesh(the_shape)
# 2-D mesh
hyp2d = NetgenSimple2D(the_gen, 1.)
alg2d = NetgenAlgo2D(the_gen)
the_mesh.add_hypothesis(hyp2d, the_shape)
the_mesh.add_hypothesis(alg2d, the_shape)
# Uncomment this to export STEP file.
# from afem.io import StepExport
# step = StepExport()
# step.transfer(shape_to_mesh)
# step.write('wingbox.step')
return GroupAPI.get_active()
if __name__ == '__main__':
start = time.time()
# Import model
fname = '../models/777-200LR.xbf'
bodies = Body.load_bodies(fname)
wing_in = bodies['Wing']
gui = Viewer()
# Build wing box
inputs = {
'build aux': True,
'mid spar rib': 10,
'aux rib list': ['2', '5', '8']
}
group = build_wingbox(wing_in, inputs)
gui.add(group)
gui.start()
print('Complete in ', time.time() - start, ' seconds.')
from afem.geometry import *
from afem.graphics import Viewer
from afem.sketch import *
from afem.topology import *
# Create a new cross section
cs = Airfoil()
# Generate a 2-D profile by reading and approximating an airfoil file from the
# UIUC database. Close the trailing edge if necessary.
cs.read_uiuc('../models/clarky.dat', close=True)
# Define a plane at the root and scale
pln1 = PlaneByAxes(axes='xz').plane
cs.build(pln1, scale=5)
wire1 = cs.wires[0]
# Define plane at the tip and rotate
pln2 = PlaneByAxes((3, 15, 0), axes='xz').plane
cs.build(pln2, scale=1.5, rotate=3)
wire2 = cs.wires[0]
# Use the wires to loft a solid
shape = LoftShape([wire1, wire2], True).shape
gui = Viewer()
gui.add(wire1, wire2, shape)
gui.start()
from afem.config import Settings
from afem.exchange import ImportVSP
from afem.graphics import Viewer
Settings.log_to_console()
# This model has bad shapes. Look at the leading edge and you'll see the
# self-intersection.
fn = '../models/vsp_bad_geom.stp'
vsp_import = ImportVSP(fn)
htail = vsp_import['Htail']
gui = Viewer()
htail.set_color(0.5, 0.5, 0.5)
gui.add(htail)
for shape in vsp_import.invalid_shapes:
shape.set_color(1, 0, 0)
gui.add(shape)
gui.start()
from afem.config import Settings from afem.exchange import ImportVSP from afem.graphics import Viewer Settings.log_to_console() fn = '../models/777-200LR.stp' vsp_import = ImportVSP(fn) v = Viewer() v.add(*vsp_import.all_bodies) v.start()
from afem.exchange import ImportVSP
from afem.graphics import Viewer
from afem.smesh import *
from afem.topology import FixShape, FuseShapes
Settings.log_to_console()
# Import an OpenVSP STEP file. If generated using the modified version that
# includes metadata, each Body will be retrievable by its component name.
fn = './models/777-200LR.stp'
# Import the OpenVSP STEP file
vsp_import = ImportVSP(fn)
# View the bodies
gui = Viewer()
solids = []
for body in vsp_import.all_bodies:
gui.add(body)
solids.append(body.shape)
gui.start()
gui.clear()
# The Boolean fuse operation must have arguments and tools. Pick one solid to
# be an argument and the others tools. So far the choice of argument and tools
# has not impacted the final fused shape. If you're able to pick the arguments
# and tools, perhaps picking the largest/most connected solid is best (like
# a fuselage)?
args = [solids[0]]
tools = solids[1:]
alg2d = NetgenAlgo2D(gen) hyp2d_1 = NetgenSimple2D(gen, 1.) hyp2d_2 = NetgenSimple2D(gen, 1., allow_quads=False) alg1d = Regular1D(gen) hyp1d = MaxLength1D(gen, 0.25) # Add them to the mesh mesh.add_hypotheses([alg2d, hyp2d_1]) mesh.add_hypothesis(hyp2d_2, faces[-1]) mesh.add_hypotheses([alg1d, hyp1d], edges[-1]) # Compute the mesh gen.compute(mesh) # View the mesh gui = Viewer() gui.add(mesh) gui.start() gui.clear() # Get sub-meshes from sub-shapes face_submesh = mesh.get_submesh(faces[0]) edge_submesh = mesh.get_submesh(edges[0]) # View the face sub-mesh (2-D elements) gui.add(face_submesh) gui.start() gui.clear() # View the edge sub-mesh (1-D elements) gui.add(edge_submesh)
# Get bodies.
fuselage = bodies['Fuselage']
wing = bodies['Wing']
other_wing = bodies['Wing.2']
gear = bodies['Gear Pod']
other_gear = bodies['Gear Pod.1']
htail = bodies['Htail']
other_htail = bodies['Htail.3']
vtail = bodies['Vtail']
jury = bodies['Jury']
other_jury = bodies['Jury.4']
strut = bodies['Strut']
other_strut = bodies['Strut.5']
gui = Viewer()
for body in [
fuselage, wing, other_wing, gear, other_gear, htail, other_htail,
vtail, jury, other_jury, strut, other_strut
]:
body.set_color(0.5, 0.5, 0.5)
body.set_transparency(0.5)
gui.add(body)
# WING ------------------------------------------------------------------------
GroupAPI.create_group('wing group')
# Center wing structure will be based on the intersection between the wings
# and fuselage.
shape = IntersectShapes(fuselage.shape, wing.shape).shape
# Tail bulkhead
bbox = BBox()
bbox.add_shape(fuselage.shape)
xmax = bbox.xmax
pln = PlaneByAxes((xmax - 36, 0, 0), 'yz').plane
tail_bh = BulkheadByShape('tail bh', pln, fuselage).part
# Aft frames
plns = [rear_pressure_bh_pln, tail_bh.plane]
frames = []
for pln1, pln2 in misc_utils.pairwise(plns):
builder = FramesBetweenPlanesByDistance('frame',
pln1,
pln2,
24.,
fuselage,
8,
36.,
-36.,
first_index=next_index)
frames += builder.parts
next_index = builder.next_index
# Join
# FuseSurfaceParts([fwd_bh, rear_bh, aft_bh, floor, fskin], frames)
master = GroupAPI.get_master()
v = Viewer()
v.add(master)
v.start()
from afem.exchange import *
from afem.graphics import Viewer
fn = '../models/777-200LR_Onshape.step'
doc = XdeDocument()
shapes_label = doc.read_step(fn)
gui = Viewer()
for child_label in shapes_label.children_iter:
gui.add(child_label.shape)
print('Name: {}'.format(child_label.name))
gui.start()
from afem.geometry import * from afem.graphics import Viewer gui = Viewer() # Create a point directly from the entity. Default is (0, 0, 0). p1 = Point() # Create a point by array-like p2 = PointByArray([5, 0, 5]).point # Create a point by x-, y-, and z-coordinates. p3 = PointByXYZ(10, 0, 0).point # Interpolate the points with a curve c1 = NurbsCurveByInterp([p1, p2, p3]).curve gui.add(p1, p2, p3, c1) gui.start() # Copy curve and translate c2 = c1.copy() c2.translate((0, 10, 0)) gui.add(c2) gui.start() # Copy and translate again c3 = c2.copy() c3.translate((0, 10, 10))
import time
from afem.exchange import brep
from afem.graphics import Viewer
from afem.smesh import *
fn = 'wing_body.brep'
shape = brep.read_brep(fn)
# MeshGems
the_gen = MeshGen()
the_mesh = the_gen.create_mesh(shape)
alg2d = MeshGemsAlgo2D(the_gen)
hyp2d = MeshGemsHypo2D(the_gen, 4.)
the_mesh.add_hypotheses([alg2d, hyp2d])
print('Computing mesh with MeshGems...')
start = time.time()
the_gen.compute(the_mesh)
print('MeshGems complete in ', time.time() - start, ' seconds.')
gui = Viewer()
gui.add(the_mesh)
gui.start()
# A few notes about importing an OpenVSP STEP model:
# 1) If the model comes from the modified version that includes metadata
# then the OpenVSP components can be identified by type and retrieved
# by name. Otherwise the import methods just tries to make solid
# bodies from the components and gives them a generic name.
# 2) The import process attempts to sew the faces of the OpenVSP
# components together to form solids.
# 3) If a surface is found to be planar, it is replaced with a plane
# before sewing. This helps eliminate some degenerated edges.
# 4) Faces sharing the same domain are unified. If flat wing caps are
# used, this usually results in a single face for the entire cap
# rather than two faces split between the upper and lower surface.
# View the model
v = Viewer()
v.add(*vsp_import.all_bodies)
v.start()
v.clear()
# Retrieve relative components by name and set transparency for viewing
wing_ = vsp_import.get_body('wing')
fuse_ = vsp_import.get_body('fuse')
wing_.set_transparency(0.5)
fuse_.set_transparency(0.5)
# OpenVSP 3.5 was modified by Laughlin Research to construct and export
# metadata and reference geometry in the STEP file. For a wing component,
# the reference geometry includes a surface that is lofted through the
# chord lines at each wing station. This surface is used to define
# structure in terms of percent chord and/or semispan. Currently, the
p2 = Point(10, 0, 0)
p3 = Point(10, 10, 0)
p4 = Point(5, 10, 0)
p5 = Point(0, 10, 0)
wire = Wire.by_points([p1, p2, p3, p4, p5], True)
face = Face.by_wire(wire)
# Mesh using composite side algorithm to avoid making a vertex at edge
the_gen = MeshGen()
the_mesh = the_gen.create_mesh(face)
hyp1d = LocalLength1D(the_gen, 4)
alg1d = CompositeSide1D(the_gen)
the_mesh.add_hypotheses([hyp1d, alg1d], wire)
hyp2d = NetgenSimple2D(the_gen, 1)
alg2d = NetgenAlgo2D(the_gen)
the_mesh.add_hypotheses([hyp2d, alg2d], face)
the_gen.compute(the_mesh, face)
# Get the composite side
for e in wire.edges:
fside = alg1d.get_face_side(the_mesh, e, face)
if fside.num_nodes:
break
gui = Viewer()
gui.view_top()
for vert in face.vertices:
gui.add(vert)
gui.add(the_mesh)
gui.start()
frame_pln_face = FaceBySurface(frame.sref).face
shape = CommonShapes(below_cargo_floor, frame_pln_face).shape
shape = CutShapes(shape, rev_cylinder).shape
frame.merge(shape, True)
i += 1
main_floor.set_transparency(0.5)
cargo_floor.set_transparency(0.5)
all_parts = GroupAPI.get_parts(order=True)
# Split all parts together
join = SplitParts(all_parts)
# Mesh
the_mesh = MeshVehicle(4.)
# Mapped quads applied to applicable faces
the_mesh.set_quadrangle_2d(the_mesh.shape)
print('Computing the mesh...')
the_mesh.compute()
# View
gui = Viewer()
gui.add(GroupAPI.get_master())
gui.start()
gui.clear()
gui.add(the_mesh)
gui.start()
"""
Test case from: https://github.com/tpaviot/pythonocc-core/issues/522
"""
from afem.exchange import StepRead
from afem.graphics import Viewer
# Read the file
reader = StepRead('../models/geometry_names.step')
shape = reader.shape
# Traverse all the faces and find the desired ones based on their name
faces = []
for f in shape.faces:
name = reader.name_from_shape(f)
if name == 'CYLINDER_TOP':
f.set_color(1, 0, 0)
elif name == 'FACE_UP':
f.set_color(0, 0, 1)
else:
f.set_color(0.5, 0.5, 0.5)
faces.append(f)
# Show the model with named faces as different colors
gui = Viewer()
gui.add(*faces)
gui.start()
# A few notes about importing an OpenVSP STEP model:
# 1) If the model comes from the modified version that includes metadata
# then the OpenVSP components can be identified by type and retrieved
# by name. Otherwise the import methods just tries to make solid
# bodies from the components and gives them a generic name.
# 2) The import process attempts to sew the faces of the OpenVSP
# components together to form solids.
# 3) If a surface is found to be planar, it is replaced with a plane
# before sewing. This helps eliminate some degenerated edges.
# 4) Faces sharing the same domain are unified. If flat wing caps are
# used, this usually results in a single face for the entire cap
# rather than two faces split between the upper and lower surface.
# View the model
gui = Viewer()
gui.add(*vsp_import.all_bodies)
gui.start()
gui.clear()
# Retrieve relative components by name and set transparency for viewing
wing_ = vsp_import['wing']
fuse_ = vsp_import['fuse']
wing_.set_transparency(0.5)
fuse_.set_transparency(0.5)
# OpenVSP 3.5 was modified by Laughlin Research to construct and export
# metadata and reference geometry in the STEP file. For a wing component,
# the reference geometry includes a surface that is lofted through the
# chord lines at each wing station. This surface is used to define
# structure in terms of percent chord and/or semispan. Currently, the
DiscardByCref(internal_parts)
skin = SkinByBody('skin', wing).part
skin.fuse(*internal_parts)
skin.set_transparency(0.5)
# Vtail structure
GroupAPI.create_group('vtail group')
fspar = SparByParameters('vtail fspar', 0.15, 0.01, 0.15, 0.99, vtail).part
rspar = SparByParameters('vtail rspar', 0.70, 0.01, 0.70, 0.99, vtail).part
RibByPoints('vtail root rib', fspar.p1, rspar.p1, vtail)
RibByPoints('vtail tip rib', fspar.p2, rspar.p2, vtail)
RibsAlongCurveByDistance('vtail rib', rspar.cref, 18, fspar.shape, rspar.shape,
vtail, d1=18, d2=-30)
internal_parts = GroupAPI.get_parts()
FuseSurfacePartsByCref(internal_parts)
DiscardByCref(internal_parts)
skin = SkinByBody('vtail skin', vtail).part
skin.fuse(*internal_parts)
skin.discard_by_dmin(vtail.sref_shape, 1.)
skin.fix()
# View
skin.set_transparency(0.5)
v = Viewer()
v.add(GroupAPI.get_master())
v.start()
from afem.config import Settings
from afem.exchange import ImportVSP
from afem.geometry import *
from afem.graphics import Viewer
from afem.structure import *
from afem.topology import *
Settings.log_to_console()
# Set units to inch.
Settings.set_units('in')
# Initialize a viewer
gui = Viewer()
# Import an OpenVSP model that includes OML reference geometry
fn = r'../models/simple_wing.stp'
vsp_import = ImportVSP(fn)
wing = vsp_import['WingGeom']
wing.set_color(1., 0., 0.)
wing.set_transparency(0.75)
gui.add(wing.sref, wing)
gui.start()
gui.clear()
# Define a group to put the structure in
wingbox = GroupAPI.create_group('wing box')
spars_assy = wingbox.create_subgroup('spar assy', active=True)
ribs_assy = wingbox.create_subgroup('rib assy', active=False)
doc = XdeDocument(False)
# Add label for the main shape
main = doc.add_shape(solid, 'The Box')
# Add labels for the sub-shapes
doc.add_subshape(main, f1, 'top face')
doc.add_subshape(main, f2, 'bottom face')
doc.add_subshape(main, f3, 'front face')
doc.add_subshape(main, f4, 'back face')
doc.add_subshape(main, f5, 'left face')
doc.add_subshape(main, f6, 'right face')
# Save document
doc.save_as('named_box')
# Close and then reopen the document
doc.close()
doc.open('named_box')
# Get the top-level shape
label = doc.get_shape_by_name('The Box')
# Print the child labels
for child in label.children_iter:
print('Sub-label name:', child.name)
gui = Viewer()
gui.add(label.shape)
gui.start()
30,
fspar.shape,
rspar.shape,
wing,
d1=30,
d2=-30)
internal_parts = wingbox.get_parts()
skin = SkinByBody('skin', wing).part
cref = wing.sref.u_iso(0.5)
skin.discard_by_dmin(cref, 1.0)
FuseSurfaceParts([skin], internal_parts)
group = GroupAPI.get_master()
gui = Viewer()
gui.add(group)
gui.start()
# Save
print('\nSaving group...')
GroupAPI.save_model('structure.xbf')
print('done.\n')
# Load into new group
print('Loading group...')
new_group = GroupAPI.create_group('new model')
GroupAPI.load_model('structure.xbf', new_group)
print('done.')
gui.clear()
gui.add(new_group)
def show_shapes(*shapes):
gui = Viewer()
gui.add(*shapes)
gui.start()
DiscardByCref(internal_parts)
skin = SkinByBody('skin', wing).part
skin.fuse(*internal_parts)
skin.set_transparency(0.5)
# Vtail structure
GroupAPI.create_group('vtail group')
fspar = SparByParameters('vtail fspar', 0.15, 0.01, 0.15, 0.99, vtail).part
rspar = SparByParameters('vtail rspar', 0.70, 0.01, 0.70, 0.99, vtail).part
RibByPoints('vtail root rib', fspar.cref.p1, rspar.cref.p1, vtail)
RibByPoints('vtail tip rib', fspar.cref.p2, rspar.cref.p2, vtail)
RibsAlongCurveByDistance('vtail rib', rspar.cref, 18, fspar.shape, rspar.shape,
vtail, d1=18, d2=-30)
internal_parts = GroupAPI.get_parts()
FuseSurfacePartsByCref(internal_parts)
DiscardByCref(internal_parts)
skin = SkinByBody('vtail skin', vtail).part
skin.fuse(*internal_parts)
skin.discard_by_dmin(vtail.sref_shape, 1.)
skin.fix()
# View
skin.set_transparency(0.5)
gui = Viewer()
gui.add(GroupAPI.get_master())
gui.start()
from afem.config import Settings from afem.exchange import ImportVSP from afem.graphics import Viewer Settings.log_to_console() fn = '../models/777-200LR.stp' vsp_import = ImportVSP(fn) gui = Viewer() gui.add(*vsp_import.all_bodies) gui.start()
p1 = [45.164217, 29.445051, 4.63929]
p2 = [47.890914, 29.45361, 4.622345]
c4 = NurbsCurveByPoints([p1, p2]).curve
sref = NurbsSurfaceByInterp([c1, c2, c3, c4], 1).surface
rhs_wing.set_sref(sref)
p1 = [23.06578, 0., 4.423368]
p2 = [36.52671, 0., 2.857832]
c1 = NurbsCurveByPoints([p1, p2]).curve
p1 = [25.217943, -3.054401, 4.46611]
p2 = [37.050119, -3.054681, 3.562711]
c2 = NurbsCurveByPoints([p1, p2]).curve
p1 = [31.126975, -10.877183, 4.513347]
p2 = [38.382418, -10.890519, 4.304047]
c3 = NurbsCurveByPoints([p1, p2]).curve
p1 = [45.164217, -29.445051, 4.63929]
p2 = [47.890914, -29.45361, 4.622345]
c4 = NurbsCurveByPoints([p1, p2]).curve
sref = NurbsSurfaceByInterp([c1, c2, c3, c4], 1).surface
lhs_wing.set_sref(sref)
v = Viewer()
for shape in [fuselage, lhs_wing, rhs_wing]:
v.add(shape)
v.start()
