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 = faceUtils.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.updateAdjacencies()
return newMesh
def extrudeTapered(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 = faceUtils.center(face)
normal = faceUtils.normal(face)
scaled_normal = vec.scale(normal, height)
# calculate new vertex positions
new_vertices = []
for i in range(len(face.vertices)):
n1 = face.vertices[i]
betw = vec.subtract(center_vertex, n1)
betw = vec.scale(betw, fraction)
nn = vec.add(n1, betw)
nn = vec.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:
faceUtils.copyProperties(face,new_face)
return new_faces
def extrudeToPointCenter(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 = faceUtils.normal(face)
normal = vec.scale(normal,height)
center = faceUtils.center(face)
center = vec.add(center,normal)
return extrudeToPoint(face,center)
def splitRoof(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 = faceUtils.normal(face)
normal = vec.scale(normal,height)
if len(face.vertices) == 4:
ev1 = vec.center(face.vertices[0], face.vertices[1])
ev1 = vec.add(ev1, normal)
ev2 = vec.center(face.vertices[2], face.vertices[3])
ev2 = vec.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:
faceUtils.copyProperties(face,f)
return faces
elif len(face.vertices) == 3:
ev1 = vec.center(face.vertices[0], face.vertices[1])
ev1 = vec.add(ev1, normal)
ev2 = vec.center(face.vertices[1], face.vertices[2])
ev2 = vec.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:
faceUtils.copyProperties(face, f)
return faces
return [face]
def 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=faceUtils.normal(face)
normal=vec.scale(normal,height)
# calculate vertices
new_vertices=[]
for i in range(len(face.vertices)):
new_vertices.append(vec.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:
faceUtils.copyProperties(face,new_face)
return new_faces
def _translateFaceVertices(mesh,values):
for face,value in zip(mesh.faces, values):
normal=faceUtils.normal(face)
normal.scale(value)
face.vertex.add(normal)