def offset(mesh,offset=1,doclose=True):
newMesh=Mesh()
# calculate vertex normals
for vertex in mesh.vertices:
vertex.vertex = Vertex(0,0,0)
vertex.nfaces = 0
for face in mesh.faces:
normal = utils_face.face_normal(face)
for vertex in face.vertices:
vertex.vertex.add(normal)
vertex.nfaces += 1
for vertex in mesh.vertices:
vertex.vertex.scale(offset / vertex.nfaces)
vertex.vertex.add(vertex)
# create faces
for face in mesh.faces:
offsetVertices = []
for vertex in face.vertices:
offsetVertices.append(vertex.vertex)
offsetVertices.reverse()
newFace = Face(offsetVertices)
newMesh.faces.append(newFace)
newMesh.faces.append(face)
# create sides
if doclose:
for edge in mesh.edges:
if edge.face1 == None or edge.face2 == None:
offsetVertices = [edge.v1, edge.v2, edge.v2.vertex, edge.v1.vertex]
if edge.face2 == None:
offsetVertices.reverse()
newFace = Face(offsetVertices)
newMesh.faces.append(newFace)
newMesh.update_topology()
return newMesh
def subdivide_face_extrude_tapered(face, height=0.0, fraction=0.5,doCap=True):
"""
Extrudes the face tapered like a window by creating an
offset face and quads between every original edge and the
corresponding new edge.
Arguments:
----------
face : mola.core.Face
The face to be extruded
height : float
The distance of the new face to the original face, default 0
fraction : float
The relative offset distance, 0: original vertex, 1: center point
default 0.5 (halfway)
"""
center_vertex = utils_face.face_center(face)
normal = utils_face.face_normal(face)
scaled_normal = utils_vertex.vertex_scale(normal, height)
# calculate new vertex positions
new_vertices = []
for i in range(len(face.vertices)):
n1 = face.vertices[i]
betw = utils_vertex.vertex_subtract(center_vertex, n1)
betw = utils_vertex.vertex_scale(betw, fraction)
nn = utils_vertex.vertex_add(n1, betw)
nn = utils_vertex.vertex_add(nn, scaled_normal)
new_vertices.append(nn)
new_faces = []
# create the quads along the edges
num = len(face.vertices)
for i in range(num):
n1 = face.vertices[i]
n2 = face.vertices[(i + 1) % num]
n3 = new_vertices[(i + 1) % num]
n4 = new_vertices[i]
new_face = Face([n1,n2,n3,n4])
new_faces.append(new_face)
# create the closing cap face
if doCap:
cap_face = Face(new_vertices)
new_faces.append(cap_face)
for new_face in new_faces:
utils_face.face_copy_properties(face,new_face)
return new_faces
def subdivide_face_extrude_to_point_center(face, height=0.0):
"""
Extrudes the face to the center point moved by height
normal to the face and creating a triangular face from
each edge to the point.
Arguments:
----------
face : mola.core.Face
The face to be extruded
height : float
The distance of the new point to the face center, default 0
"""
normal = utils_face.face_normal(face)
normal = utils_vertex.vertex_scale(normal,height)
center = utils_face.face_center(face)
center = utils_vertex.vertex_add(center,normal)
return subdivide_face_extrude_to_point(face,center)
def subdivide_face_split_roof(face, height):
"""
Extrudes a pitched roof
Arguments:
----------
face : mola.core.Face
The face to be extruded
height : mola.core.Vertex
Th height of the roof
"""
faces = []
normal = utils_face.face_normal(face)
normal = utils_vertex.vertex_scale(normal,height)
if len(face.vertices) == 4:
ev1 = utils_vertex.vertex_center(face.vertices[0], face.vertices[1])
ev1 = utils_vertex.vertex_add(ev1, normal)
ev2 = utils_vertex.vertex_center(face.vertices[2], face.vertices[3])
ev2 = utils_vertex.vertex_add(ev2, normal)
faces.append(Face([face.vertices[0], face.vertices[1], ev1]))
faces.append(Face([face.vertices[1], face.vertices[2], ev2, ev1]))
faces.append(Face([face.vertices[2], face.vertices[3], ev2]))
faces.append(Face([face.vertices[3], face.vertices[0], ev1, ev2]))
for f in faces:
utils_face.face_copy_properties(face,f)
return faces
elif len(face.vertices) == 3:
ev1 = utils_vertex.vertex_center(face.vertices[0], face.vertices[1])
ev1 = utils_vertex.vertex_add(ev1, normal)
ev2 = utils_vertex.vertex_center(face.vertices[1], face.vertices[2])
ev2 = utils_vertex.vertex_add(ev2, normal)
faces.append(Face([face.vertices[0], face.vertices[1], ev1]))
faces.append(Face([face.vertices[1], ev2, ev1]))
faces.append(Face([face.vertices[1], face.vertices[2], ev2]))
faces.append(Face([face.vertices[2], face.vertices[0], ev1, ev2]))
for f in faces:
utils_face.face_copy_properties(face, f)
return faces
return [face]
def curvature(self):
"""
Returns the local curvature of a mesh face, by measuring the angle to the neighbour faces.
"""
facenormal = self.normal()
sumD = 0
vPrev = self.vertices[-1]
num_faces = 1
for v in self.vertices:
edge = v.edge_adjacent_to_vertex(vPrev)
if edge != None:
nbFace = edge.face1
if edge.face1 == self:
nbFace = edge.face2
if nbFace != None:
num_faces += 1
nbNormal = utils_face.face_normal(nbFace)
sumD += utils_vertex.vertex_distance(nbNormal,facenormal)
vPrev = v
return sumD / num_faces
def mesh_offset(mesh, offset=1, doclose=True):
"""
Creates an offset of a mesh.
If `doclose` is `True`, it will create quad faces
along the naked edges of an open input mesh.
"""
newMesh = Mesh()
# calculate vertex normals
for vertex in mesh.vertices:
vertex.vertex = Vertex(0, 0, 0)
vertex.nfaces = 0
for face in mesh.faces:
normal = utils_face.face_normal(face)
for vertex in face.vertices:
vertex.vertex.add(normal)
vertex.nfaces += 1
for vertex in mesh.vertices:
vertex.vertex.scale(offset / vertex.nfaces)
vertex.vertex.add(vertex)
# create faces
for face in mesh.faces:
offsetVertices = []
for vertex in face.vertices:
offsetVertices.append(vertex.vertex)
offsetVertices.reverse()
newFace = Face(offsetVertices)
newMesh.faces.append(newFace)
newMesh.faces.append(face)
# create sides
if doclose:
for edge in mesh.edges:
if edge.face1 == None or edge.face2 == None:
offsetVertices = [
edge.v1, edge.v2, edge.v2.vertex, edge.v1.vertex
]
if edge.face2 == None:
offsetVertices.reverse()
newFace = Face(offsetVertices)
newMesh.faces.append(newFace)
newMesh.update_topology()
return newMesh
def subdivide_face_extrude(face, height=0.0, capBottom=False, capTop=True):
"""
Extrudes the face straight by distance height.
Arguments:
----------
face : mola.core.Face
The face to be extruded
height : float
The extrusion distance, default 0
capBottom : bool
Toggle if bottom face (original face) should be created, default False
capTop : bool
Toggle if top face (extrusion face) should be created, default True
"""
normal=utils_face.face_normal(face)
normal=utils_vertex.vertex_scale(normal,height)
# calculate vertices
new_vertices=[]
for i in range(len(face.vertices)):
new_vertices.append(utils_vertex.vertex_add(face.vertices[i], normal))
# faces
new_faces=[]
if capBottom:
new_faces.append(face)
for i in range(len(face.vertices)):
i2=i+1
if i2>=len(face.vertices):
i2=0
v0=face.vertices[i]
v1=face.vertices[i2]
v2=new_vertices[i2]
v3=new_vertices[i]
new_faces.append(Face([v0,v1,v2,v3]))
if capTop:
new_faces.append(Face(new_vertices))
for new_face in new_faces:
utils_face.face_copy_properties(face,new_face)
return new_faces
def _translate_face_vertices(mesh,values):
for face,value in zip(mesh.faces, values):
normal=utils_face.face_normal(face)
normal.scale(value)
face.vertex.add(normal)
def subdivide_custom_triface_extrude_tapered_nonU(face,
height=0.0,
fraction=0.5,
doCap=True):
"""
Extrudes a triangular face tapered like a window by creating an
offset face and quads between every original edge and the
corresponding new edge. The vertices of the new edge which corresponds
to the shortest edge of the triangle are moved closer to the later,
while preserving the offset from its other edges
Arguments:
----------
face : mola.core.Face
The face to be extruded
height : float
The distance of the new face to the original face, default 0
fraction : float
The relative offset distance, 0: original vertex, 1: center point
default 0.5 (halfway)
"""
center_vertex = utils_face.face_center(face)
normal = utils_face.face_normal(face)
scaled_normal = utils_vertex.vertex_scale(normal, height)
minD = 9999999999999999
for i in range(len(face.vertices) - 1):
n1 = face.vertices[i]
for j in range(i + 1, len(face.vertices)):
n2 = face.vertices[j]
d = (n2.x - n1.x)**2.0 + (n2.y - n1.y)**2.0 + (n2.z - n1.z)**2.0
if d < minD:
minD = d
shortF_st = i
shortF_end = j
other = 3 - shortF_st - shortF_end
n_other = face.vertices[other]
betw_other = utils_vertex.vertex_subtract(center_vertex, n_other)
betw_other = utils_vertex.vertex_scale(betw_other, fraction)
nn_other = utils_vertex.vertex_add(n_other, betw_other)
nn_other = utils_vertex.vertex_add(nn_other, scaled_normal)
# calculate new vertex positions
new_vertices = []
for i in range(len(face.vertices)):
n1 = face.vertices[i]
betw = utils_vertex.vertex_subtract(center_vertex, n1)
betw = utils_vertex.vertex_scale(betw, fraction)
nn = utils_vertex.vertex_add(n1, betw)
nn = utils_vertex.vertex_add(nn, scaled_normal)
if i == shortF_st or i == shortF_end:
vec = utils_vertex.vertex_subtract(n1, nn_other)
vec = utils_vertex.vertex_scale(vec, 0.25)
nn = utils_vertex.vertex_add(nn, vec)
new_vertices.append(nn)
new_faces = []
# create the quads along the edges
num = len(face.vertices)
for i in range(num):
n1 = face.vertices[i]
n2 = face.vertices[(i + 1) % num]
n3 = new_vertices[(i + 1) % num]
n4 = new_vertices[i]
new_face = Face([n1, n2, n3, n4])
new_faces.append(new_face)
# create the closing cap face
if doCap:
cap_face = Face(new_vertices)
new_faces.append(cap_face)
for new_face in new_faces:
utils_face.face_copy_properties(face, new_face)
return new_faces