def discretise_mesh(mesh, layer, target, min_angle=15, factor=1):
""" Discretise a mesh from an input triangulated coarse mesh into small denser meshes.
Parameters
----------
mesh : guid
The guid of the Rhino input mesh.
layer : str
Layer name to draw results.
target : float
Target length of each triangle.
min_angle : float
Minimum internal angle of triangles.
factor : float
Factor on the maximum area of each triangle.
Returns
-------
None
"""
rhinomesh = RhinoMesh(mesh)
vertices = rhinomesh.get_vertex_coordinates()
faces = [face[:3] for face in rhinomesh.get_face_vertices()]
try:
points, tris = meshing.discretise_faces(vertices=vertices,
faces=faces,
target=target,
min_angle=min_angle,
factor=factor)
rs.CurrentLayer(rs.AddLayer(layer))
rs.DeleteObjects(rs.ObjectsByLayer(layer))
rs.EnableRedraw(False)
for pts, tri in zip(points, tris):
mesh_faces = []
for i in tri:
face_ = i + [i[-1]]
mesh_faces.append(face_)
rs.AddMesh(pts, mesh_faces)
rs.EnableRedraw(True)
except:
print('***** Error using MeshPy (Triangle) or drawing faces *****')
def add_tets_from_mesh(structure,
name,
mesh,
draw_tets=False,
volume=None,
layer='Default',
acoustic=False,
thermal=False):
""" Adds tetrahedron elements from a Rhino mesh to the Structure object.
Parameters
----------
structure : obj
Structure object to update.
name : str
Name for the element set of tetrahedrons.
mesh : obj
The Rhino mesh representing the outer surface.
draw_tets : bool
Draw the generated tetrahedrons.
volume : float
Maximum volume for each tet.
layer : str
Layer to draw tetrahedrons if draw_tets=True.
acoustic : bool
Acoustic properties on or off.
thermal : bool
Thermal properties on or off.
Returns
-------
None
Nodes and elements are updated in the Structure object.
"""
rhinomesh = RhinoMesh(mesh)
vertices = rhinomesh.get_vertex_coordinates()
faces = [face[:3] for face in rhinomesh.get_face_vertices()]
basedir = utilities.__file__.split('__init__.py')[0]
xfunc = XFunc('tets', basedir=basedir, tmpdir=structure.path)
xfunc.funcname = 'functions.tets_from_vertices_faces'
try:
tets_points, tets_elements = xfunc(vertices=vertices,
faces=faces,
volume=volume)
for point in tets_points:
structure.add_node(point)
ekeys = []
for element in tets_elements:
nodes = [
structure.check_node_exists(tets_points[i]) for i in element
]
ekey = structure.add_element(nodes=nodes,
type='TetrahedronElement',
acoustic=acoustic,
thermal=thermal)
ekeys.append(ekey)
structure.add_set(name=name, type='element', selection=ekeys)
if draw_tets:
rs.EnableRedraw(False)
rs.DeleteObjects(rs.ObjectsByLayer(layer))
rs.CurrentLayer(layer)
tet_faces = [[0, 2, 1, 1], [1, 2, 3, 3], [1, 3, 0, 0],
[0, 3, 2, 2]]
for i, points in enumerate(tets_elements):
xyz = [tets_points[j] for j in points]
rs.AddMesh(vertices=xyz, face_vertices=tet_faces)
rs.EnableRedraw(True)
except:
print('***** Error using MeshPy or drawing Tets *****')
def add_tets_from_mesh(structure,
name,
mesh,
draw_tets=False,
volume=None,
thermal=False):
""" Adds tetrahedron elements from a mesh in Rhino to the Structure object.
Parameters
----------
structure : obj
Structure object to update.
name : str
Name for the element set of tetrahedrons.
mesh : guid
The mesh in Rhino representing the outer surface.
draw_tets : str
Layer to draw tetrahedrons on.
volume : float
Maximum volume for each tet.
thermal : bool
Thermal properties on or off.
Returns
-------
None
"""
rhinomesh = RhinoMesh(mesh)
vertices = rhinomesh.get_vertex_coordinates()
faces = [face[:3] for face in rhinomesh.get_face_vertices()]
try:
tets_points, tets_elements = meshing.tets_from_vertices_faces(
vertices=vertices, faces=faces, volume=volume)
for point in tets_points:
structure.add_node(point)
ekeys = []
for element in tets_elements:
nodes = [
structure.check_node_exists(tets_points[i]) for i in element
]
ekey = structure.add_element(nodes=nodes,
type='TetrahedronElement',
thermal=thermal)
ekeys.append(ekey)
structure.add_set(name=name, type='element', selection=ekeys)
if draw_tets:
rs.EnableRedraw(False)
rs.DeleteObjects(rs.ObjectsByLayer(draw_tets))
rs.CurrentLayer(draw_tets)
tet_faces = [[0, 2, 1, 1], [1, 2, 3, 3], [1, 3, 0, 0],
[0, 3, 2, 2]]
for i, points in enumerate(tets_elements):
xyz = [tets_points[j] for j in points]
rs.AddMesh(vertices=xyz, face_vertices=tet_faces)
rs.EnableRedraw(True)
print('***** MeshPy (TetGen) successfull *****')
except:
print('***** Error using MeshPy (TetGen) or drawing Tets *****')
