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 _collectNewFaces(mesh):
newMesh=Mesh()
for face in mesh.faces:
v1 = face.vertices[-2]
v2 = face.vertices[-1]
for v3 in face.vertices:
edge1 = mesh.getEdgeAdjacentToVertices(v1,v2)
edge2 = mesh.getEdgeAdjacentToVertices(v2,v3)
if (edge1 != None) and (edge2!= None):
newFace = Face([edge1.vertex, v2.vertex, edge2.vertex, face.vertex])
newFace.color = face.color
newFace.group = face.group
newMesh.faces.append(newFace)
v1 = v2
v2 = v3
newMesh.updateAdjacencies()
return newMesh