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Commit 3ed481ef authored by Dennis Gläser's avatar Dennis Gläser
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[ex4] modify example code

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appl/example4/README.md
View file @ 3ed481ef
......@@ -14,7 +14,7 @@ realize this example using the Frackit python bindings.__
* create a domain geometry by intersection/cut operations on basic geometry types
* generate random polygons using the `PolygonSampler` class
* design your own incremental network generation algorithm
* design a custom, incremental network generation algorithm
Let us consider some idealized, hexahedral geological layer with an embedded
tunnel structure. The excavation of tunnels can have an effect on the stress
......@@ -24,7 +24,7 @@ of how such situations can modeled using `Frackit`.
### Step 1: domain generation
We want to focus on a spherical region around the center of the hexahedral
We want to focus on a spherical region around the center of a hexahedral
layer. To this end, we construct instances of the `Box` and `Sphere` classes
to represent these two geometries:
......@@ -71,7 +71,7 @@ if (solids.size() != 1) throw std::runtime_error("Cut operation with tunnel shou
const auto& domain = solids[0];
```
## Step 2: entity sampler definitions
### Step 2: entity sampler definitions
Instead of randomly sample entities within the domain volume, in this example we
want to use a different approach. Here, the goal is to generate a network in the
......@@ -196,45 +196,32 @@ rejected immediately.
__Stage 2__: For each entity `e` of stage 1, we want to generate an entity of orientation 2
that intersects `e`. Therefore, we loop over all entities of stage 1 and sample new
candidates in their vicinity. This is achieved by computing the bounding box of `e`,
which is then used to define a region in which new candidates are sampled:
which is then used to define a region in which new candidates are sampled. This
is done within the `getVicinityPointSampler` lambda:
```cpp
for (const auto& e : entitiesSet1)
// this lambda function generates a point sampler within the vicinity of the given geometry
auto getVicinityPointSampler = [&] (const auto& g, unsigned int orientationIdx)
{
using std::sqrt;
// sample an entity of orientation 2 in the vicinity of e
const auto rawBBox = getBoundingBox(e);
const auto charLength = sqrt(computeMagnitude(e)); // characteristic length of e
const auto rawBBox = getBoundingBox(g);
const auto charLength = sqrt(computeMagnitude(g));
const Box sampleBox(rawBBox.xMin()-charLength, rawBBox.yMin()-charLength, rawBBox.zMin()-charLength,
rawBBox.xMax()+charLength, rawBBox.yMax()+charLength, rawBBox.zMax()+charLength);
auto sampler = getSampler(makeUniformPointSampler(sampleBox), /*orientationIdx*/2);
return getSampler(makeUniformPointSampler(sampleBox), orientationIdx);
};
```
The variable `sampler` now holds an instance of the `PolygonSampler` class, which generates
polygons of orientation 2 within the box `sampleBox` that describes the vicinity of `e`.
We then sample candidates until we have found an entity that fulfills all desired constraints.
After that, it is continued with the next entity of `entitiesSet1` until all have been visited.
Reusing the `getSampler` lambda, this returns an instance of the `PolygonSampler` class, which generates
polygons of the given orientation within the box `sampleBox` that describes the vicinity of the given geometry `g`.
Such samplers are then successively created for each entity of stage 1 in order to
find one intersecting entity of orientation 2.
__Stage 3__: this stage follows the same logic as stage 2, but it samples entities of
orientation 3 and looks for entity candidates in the vicinity of the entities of stage 2:
```cpp
for (const auto& e : entitiesSet2)
{
using std::sqrt;
// sample an entity of orientation 2 in the vicinity of e
const auto rawBBox = getBoundingBox(e);
const auto charLength = sqrt(computeMagnitude(e));
const Box sampleBox(rawBBox.xMin()-charLength, rawBBox.yMin()-charLength, rawBBox.zMin()-charLength,
rawBBox.xMax()+charLength, rawBBox.yMax()+charLength, rawBBox.zMax()+charLength);
auto sampler = getSampler(makeUniformPointSampler(sampleBox), /*orientationIdx*/3);
```
Note that due to the restrictive constraints used in this example, the entity
generation step can take up to a few minutes.
......@@ -248,8 +235,10 @@ to construct the network and embed it in our domain:
std::cout << "Building and writing network" << std::endl;
ContainedEntityNetworkBuilder<ctype> builder;
// add sub-domains
builder.addConfiningSubDomain(domain, Id(1));
// add sub-domain
builder.addConfiningSubDomain(domain, Id(1));
// embed all entities in that domain
builder.addSubDomainEntities(entitiesSet1, Id(1));
builder.addSubDomainEntities(entitiesSet2, Id(1));
builder.addSubDomainEntities(entitiesSet3, Id(1));
......
appl/example4/example4.cc
View file @ 3ed481ef
......@@ -89,23 +89,25 @@ int main(int argc, char** argv)
const Circle tunnelBase(Point(-25.0, 0.0, 0.0), tunnelDirection, tunnelRadius);
const Cylinder tunnel(tunnelBase, /*height*/50.0);
// the domain is the layer constrained to the domainSphere and cut by the tunnel
// restrict the domain sphere to the layer (this should yield a single solid shape)
const auto layerSphereCut = OCCUtilities::intersect(OCCUtilities::getShape(layer),
OCCUtilities::getShape(domainSphere),
/*eps*/1e-6);
auto solids = OCCUtilities::getSolids(layerSphereCut);
if (solids.size() != 1) throw std::runtime_error("Intersection operation with domainSphere should yield a single solid");
// now cut the tunnel out of the domain (should also yield a single solid)
const auto tunnelCut = OCCUtilities::cut(solids[0], OCCUtilities::getShape(tunnel), /*eps*/1e-6);
solids = OCCUtilities::getSolids(tunnelCut);
if (solids.size() != 1) throw std::runtime_error("Cut operation with tunnel should yield a single solid");
// get the domain shape
// we now have the resulting domain shape
const auto& domain = solids[0];
// get the OCC reprensentation of the sphere surface
const auto sphereFaces = OCCUtilities::getFaces(OCCUtilities::getShape(domainSphere));
if (sphereFaces.size() != 1) throw std::runtime_error("We expect the sphere to consist of a single face");
// get the OCC representation of the sphere surface (for constraints evaluation)
const auto sphereShape = OCCUtilities::getShape(domainSphere);
const auto& sphereFaces = OCCUtilities::getFaces(sphereShape);
if (sphereFaces.size() != 1) throw std::runtime_error("Sphere should contain a single face");
const auto& sphereSurfaceShape = sphereFaces[0];
// get the OCC representation of tunnel surface
......@@ -188,7 +190,7 @@ int main(int argc, char** argv)
auto producesSmallLengthScale = [] (const auto& geometry, const auto& is) -> bool
{
// lambda to check if the intersection is too close (< 1mm) to a vertex of the geometry
auto isTooClose = [&is] (const auto& v) { return computeDistance(v, is) < 1e-3; };
auto isTooClose = [&is] (const auto& v) { return computeDistance(v, is) < 1e-2; };
const auto shape = OCCUtilities::getShape(geometry);
const auto vertices = OCCUtilities::getVertices(shape);
......@@ -237,7 +239,8 @@ int main(int argc, char** argv)
{ status.increaseRejectedCounter(); continue; }
// compute the part contained in the domain
const auto containedShape = OCCUtilities::intersect(OCCUtilities::getShape(candidate), domain, /*eps*/1e-6);
const auto candidateShape = OCCUtilities::getShape(candidate);
const auto containedShape = OCCUtilities::intersect(candidateShape, domain, /*eps*/1e-6);
const auto containedFaces = OCCUtilities::getFaces(containedShape);
// skip everything that does not lead to a single contained face
......@@ -276,22 +279,25 @@ int main(int argc, char** argv)
<< maxTriesForEntity << " unsuccessful tries. --" << std::endl;
};
status.reset();
status.setTargetCount(idSet2, entitiesSet1.size());
for (const auto& e : entitiesSet1)
// this lambda function generates a point sampler within the vicinity of the given geometry
auto getVicinityPointSampler = [&] (const auto& g, unsigned int orientationIdx)
{
using std::sqrt;
// sample an entity of orientation 2 in the vicinity of e
const auto rawBBox = getBoundingBox(e);
const auto charLength = sqrt(computeMagnitude(e));
const auto rawBBox = getBoundingBox(g);
const auto charLength = sqrt(computeMagnitude(g));
const Box sampleBox(rawBBox.xMin()-charLength, rawBBox.yMin()-charLength, rawBBox.zMin()-charLength,
rawBBox.xMax()+charLength, rawBBox.yMax()+charLength, rawBBox.zMax()+charLength);
return getSampler(makeUniformPointSampler(sampleBox), orientationIdx);
};
status.reset();
status.setTargetCount(idSet2, entitiesSet1.size());
for (const auto& e : entitiesSet1)
{
bool accepted = false;
std::size_t tryCount = 0;
auto sampler = getSampler(makeUniformPointSampler(sampleBox), /*orientationIdx*/2);
auto sampler = getVicinityPointSampler(e, /*orientationIdx*/2);
while (!accepted && tryCount <= maxTriesForEntity)
{
tryCount++;
......@@ -309,7 +315,8 @@ int main(int argc, char** argv)
{ status.increaseRejectedCounter(); continue; }
// compute the part contained in the domain
const auto containedShape = OCCUtilities::intersect(OCCUtilities::getShape(candidate), domain, /*eps*/1e-6);
const auto candidateShape = OCCUtilities::getShape(candidate);
const auto containedShape = OCCUtilities::intersect(candidateShape, domain, /*eps*/1e-6);
const auto containedFaces = OCCUtilities::getFaces(containedShape);
// skip everything that does not lead to a single contained face
......@@ -350,18 +357,9 @@ int main(int argc, char** argv)
status.setTargetCount(idSet3, entitiesSet2.size());
for (const auto& e : entitiesSet2)
{
using std::sqrt;
// sample an entity of orientation 2 in the vicinity of e
const auto rawBBox = getBoundingBox(e);
const auto charLength = sqrt(computeMagnitude(e));
const Box sampleBox(rawBBox.xMin()-charLength, rawBBox.yMin()-charLength, rawBBox.zMin()-charLength,
rawBBox.xMax()+charLength, rawBBox.yMax()+charLength, rawBBox.zMax()+charLength);
auto sampler = getSampler(makeUniformPointSampler(sampleBox), /*orientationIdx*/3);
bool accepted = false;
std::size_t tryCount = 0;
auto sampler = getVicinityPointSampler(e, /*orientationIdx*/3);
while (!accepted && tryCount <= maxTriesForEntity)
{
tryCount++;
......@@ -379,7 +377,8 @@ int main(int argc, char** argv)
{ status.increaseRejectedCounter(); continue; }
// compute the part contained in the domain
const auto containedShape = OCCUtilities::intersect(OCCUtilities::getShape(candidate), domain, /*eps*/1e-6);
const auto candidateShape = OCCUtilities::getShape(candidate);
const auto containedShape = OCCUtilities::intersect(candidateShape, domain, /*eps*/1e-6);
const auto containedFaces = OCCUtilities::getFaces(containedShape);
// skip everything that does not lead to a single contained face
......@@ -431,8 +430,10 @@ int main(int argc, char** argv)
std::cout << "Building and writing network" << std::endl;
ContainedEntityNetworkBuilder<ctype> builder;
// add sub-domains
builder.addConfiningSubDomain(domain, Id(1));
// add sub-domain
builder.addConfiningSubDomain(domain, Id(1));
// embed all entities in that domain
builder.addSubDomainEntities(entitiesSet1, Id(1));
builder.addSubDomainEntities(entitiesSet2, Id(1));
builder.addSubDomainEntities(entitiesSet3, Id(1));
......
appl/example4/example4.py
View file @ 3ed481ef
import sys
import math
from time import process_time
startTime = process_time()
......@@ -20,21 +21,25 @@ print("\n\n"
from frackit.geometry import Box, Sphere, Cylinder, Direction, Vector, Circle, Point
# the layer has a thickness of 40m, and initially we consider 100m lateral extent
layer = Box(-50.0, -50.0, -20.0, 50.0, 50.0, 20.0)
domainSphere = Sphere(Point(0.0, 0.0, 0.0), 25.0)
layer = Box(xmin=-50.0, ymin=-50.0, zmin=-20.0,
xmax=50.0, ymax=50.0, zmax=20.0)
domainSphere = Sphere(center=Point(0.0, 0.0, 0.0), radius=25.0)
# a tunnel with a radius of 5m crosses the domain
tunnelRadius = 5.0
tunnelDirection = Direction(Vector(1.0, 0.0, 0.0))
tunnelBase = Circle(Point(-25.0, 0.0, 0.0), tunnelDirection, tunnelRadius)
tunnel = Cylinder(tunnelBase, 50.0)
tunnelBase = Circle(center = Point(-25.0, 0.0, 0.0),
normal = tunnelDirection,
radius = tunnelRadius)
tunnel = Cylinder(bottomCircle=tunnelBase, height=50.0)
# the domain is the layer constrained to the domainSphere and cut by the tunnel
# restrict the domain sphere to the layer (should yield a single solid)
from frackit.occutilities import getShape, getSolids, getFaces, cut
from frackit.occutilities import intersect as intersectShapes
solids = getSolids( intersectShapes(getShape(layer), getShape(domainSphere), 1e-6) )
if len(solids) != 1: sys.exit("Intersection operation with domainSphere should yield a single solid")
# cut the tunnel out of the domain
solids = getSolids( cut(solids[0], getShape(tunnel), 1e-6) )
if len(solids) != 1: sys.exit("Cut operation with tunnel should yield a single solid")
......@@ -66,28 +71,30 @@ def choiceSampler(a, b):
return sample
# function to create polygon samplers for the different orientations
from frackit.common import toRadians
from frackit.sampling import PolygonSampler
sizeDistro = uniformSampler(3.0, 6.0)
numCornersDistro = choiceSampler(4, 9)
def getSampler(pointSampler, orientation):
if orientation == 1:
return PolygonSampler(pointSampler, # sampler for polygon centers
normalSampler(toRadians(15.0), toRadians(10.0)), # strike angle: mean value & standard deviation
normalSampler(toRadians(90.0), toRadians(10.0)), # dip angle: mean value & standard deviation
sizeDistro, sizeDistro, numCornersDistro) # strike & dip length, number of corners
return PolygonSampler(pointSampler = pointSampler,
strikeAngleSampler = normalSampler(math.radians(15.0), math.radians(10.0)),
dipAngleSampler = normalSampler(math.radians(90.0), math.radians(10.0)),
strikeLengthSampler = uniformSampler(3.0, 6.0),
dipLengthSampler = uniformSampler(3.0, 6.0),
numCornersSampler = choiceSampler(4, 9))
elif orientation == 2:
return PolygonSampler(pointSampler, # sampler for polygon centers
normalSampler(toRadians(0.0), toRadians(10.0)), # strike angle: mean value & standard deviation
normalSampler(toRadians(0.0), toRadians(10.0)), # dip angle: mean value & standard deviation
sizeDistro, sizeDistro, numCornersDistro) # strike & dip length, number of corners
return PolygonSampler(pointSampler = pointSampler,
strikeAngleSampler = normalSampler(math.radians(0.0), math.radians(10.0)),
dipAngleSampler = normalSampler(math.radians(0.0), math.radians(10.0)),
strikeLengthSampler = uniformSampler(3.0, 6.0),
dipLengthSampler = uniformSampler(3.0, 6.0),
numCornersSampler = choiceSampler(4, 9))
elif orientation == 3:
return PolygonSampler(pointSampler, # sampler for polygon centers
normalSampler(toRadians(-75.0), toRadians(10.0)), # strike angle: mean value & standard deviation
normalSampler(toRadians(90.0), toRadians(10.0)), # dip angle: mean value & standard deviation
sizeDistro, sizeDistro, numCornersDistro) # strike & dip length, number of corners
return PolygonSampler(pointSampler = pointSampler,
strikeAngleSampler = normalSampler(math.radians(-75.0), math.radians(10.0)),
dipAngleSampler = normalSampler(math.radians(90.0), math.radians(10.0)),
strikeLengthSampler = uniformSampler(3.0, 6.0),
dipLengthSampler = uniformSampler(3.0, 6.0),
numCornersSampler = choiceSampler(4, 9))
else:
import sys
sys.exit("Unsupported orientation index")
......@@ -104,7 +111,7 @@ from frackit.entitynetwork import EntityNetworkConstraints, EntityNetworkConstra
def makeDefaultConstraints():
c = EntityNetworkConstraints()
c.setMinDistance(1.0)
c.setMinIntersectingAngle(toRadians(25.0))
c.setMinIntersectingAngle(math.radians(25.0))
c.setMinIntersectionMagnitude(0.1)
c.setMinIntersectionDistance(0.1)
return c
......@@ -124,21 +131,20 @@ constraints3.setMinDistance(0.15)
# Define constraints between entities of different sets
constraintsOnOther = makeDefaultConstraints()
constraintsOnOther.setMinDistance(0.25)
constraintsOnOther.setMinIntersectingAngle(toRadians(30.0))
constraintsOnOther.setMinIntersectingAngle(math.radians(30.0))
# Moreover, we define constraints w.r.t. the domain boundary
constraintsOnBoundary = makeDefaultConstraints()
constraintsOnBoundary.setMinIntersectingAngle(toRadians(10.0))
constraintsOnBoundary.setMinIntersectingAngle(math.radians(10.0))
# When polygons intersect, the intersection might be very close to
# one of the corner points. We want to avoid small length scales caused
# by this, and this lambda provides the check for it.
# by this, and this function provides the check for it.
def producesSmallLengthScale(geometry, isection):
from frackit.geometry import computeDistance
from frackit.occutilities import getVertices
verts = getVertices(getShape(geometry))
if any((computeDistance(v, isection) < 1e-3 for v in verts)): return True
if any((computeDistance(v, isection) < 1e-2 for v in verts)): return True
return False
###########################
......@@ -158,8 +164,11 @@ from frackit.geometry import HollowCylinder
numTargetEntities = 75
status = SamplingStatus()
status.setTargetCount(setId1, numTargetEntities)
sampleCylinder1 = HollowCylinder(tunnel.bottomFace().center(), tunnel.direction(),
tunnel.radius(), tunnel.radius() + 2.0, tunnel.height())
sampleCylinder1 = HollowCylinder(bottomCenter = tunnel.bottomFace().center(),
axis = tunnel.direction(),
innerRadius = tunnel.radius(),
outerRadius = tunnel.radius() + 2.0,
height = tunnel.height())
from frackit.geometry import computeMagnitude, getBoundingBox
from frackit.geometry import intersect
......@@ -167,7 +176,7 @@ from frackit.occutilities import getFaces
from frackit.sampling import makeUniformPointSampler
print('## Step 1: generation of entities of orientation 1 around the tunnel\n\n\n')
area = 0.0;
area = 0.0
polygonSampler1 = getSampler(makeUniformPointSampler(sampleCylinder1), 1)
while not status.finished():
candidate = polygonSampler1()
......@@ -182,15 +191,16 @@ while not status.finished():
status.increaseRejectedCounter(); continue;
# compute the part contained in the domain
containedShape = intersectShapes(getShape(candidate), domain, 1e-6)
candidateShape = getShape(candidate)
containedShape = intersectShapes(candidateShape, domain, 1e-6)
containedFaces = getFaces(containedShape)
# skip everything that does not lead to a single contained face
if len(containedFaces) != 1: status.increaseRejectedCounter(); continue;
# if too little of the candidate is inside the domain, reject it
containedFace = containedFaces[0];
containedFaceArea = computeMagnitude(containedFace);
containedFace = containedFaces[0]
containedFaceArea = computeMagnitude(containedFace)
if containedFaceArea < 0.25*candidate.area():
status.increaseRejectedCounter(); continue;
......@@ -210,26 +220,27 @@ while not status.finished():
print('\n\n\n## Step 2: for each entity so far, try to generate an intersecting entity with orientation 2\n\n\n')
# after rejecting 500 candidates for an entity, we move to the next one
maxTriesForEntity = 500;
maxTriesForEntity = 500
def printSkipMessage ():
print('\t\t -- Skipped search for this entity after ' + \
str(maxTriesForEntity) + ' unsuccessful tries. --\n')
# function to generate a point sampler within the vicinity of the given geometry
def getVicinityPointSampler(geometry, orientationIdx):
rawBBox = getBoundingBox(geometry)
charLength = math.sqrt(computeMagnitude(geometry))
sampleBox = Box(xmin=rawBBox.xMin()-charLength, ymin=rawBBox.yMin()-charLength, zmin=rawBBox.zMin()-charLength,
xmax=rawBBox.xMax()+charLength, ymax=rawBBox.yMax()+charLength, zmax=rawBBox.zMax()+charLength)
return getSampler(makeUniformPointSampler(sampleBox), orientationIdx)
from math import sqrt
status.reset()
status.setTargetCount(setId2, len(entitySets[setId1]))
for e in entitySets[setId1]:
# sample an entity of orientation 2 in the vicinity of e
rawBBox = getBoundingBox(e);
charLength = sqrt(computeMagnitude(e));
sampleBox = Box(rawBBox.xMin()-charLength, rawBBox.yMin()-charLength, rawBBox.zMin()-charLength,
rawBBox.xMax()+charLength, rawBBox.yMax()+charLength, rawBBox.zMax()+charLength);
tryCount = 0;
accepted = False;
sampler = getSampler(makeUniformPointSampler(sampleBox), 2);
tryCount = 0
accepted = False
sampler = getVicinityPointSampler(e, 2)
while not accepted and tryCount <= maxTriesForEntity:
tryCount += 1
candidate = sampler()
......@@ -253,8 +264,8 @@ for e in entitySets[setId1]:
if len(containedFaces) != 1: status.increaseRejectedCounter(); continue;
# if too little of the candidate is inside the domain, reject it
containedFace = containedFaces[0];
containedFaceArea = computeMagnitude(containedFace);
containedFace = containedFaces[0]
containedFaceArea = computeMagnitude(containedFace)
if containedFaceArea < 0.25*candidate.area():
status.increaseRejectedCounter(); continue;
......@@ -268,7 +279,7 @@ for e in entitySets[setId1]:
if not constraintsOnBoundary.evaluate(tunnelSurfaceShape, containedFace):
status.increaseRejectedCounter(); continue;
accepted = True;
accepted = True
area += containedFaceArea
entitySets[setId2].append(containedFace)
status.increaseCounter(setId2)
......@@ -283,16 +294,9 @@ status.setTargetCount(setId3, len(entitySets[setId2]))
for e in entitySets[setId2]:
# sample an entity of orientation 2 in the vicinity of e
rawBBox = getBoundingBox(e);
charLength = sqrt(computeMagnitude(e));
sampleBox = Box(rawBBox.xMin()-charLength, rawBBox.yMin()-charLength, rawBBox.zMin()-charLength,
rawBBox.xMax()+charLength, rawBBox.yMax()+charLength, rawBBox.zMax()+charLength);
tryCount = 0;
accepted = False;
sampler = getSampler(makeUniformPointSampler(sampleBox), 3);
tryCount = 0
accepted = False
sampler = getVicinityPointSampler(e, 3)
while not accepted and tryCount <= maxTriesForEntity:
tryCount += 1
candidate = sampler()
......@@ -316,8 +320,8 @@ for e in entitySets[setId2]:
if len(containedFaces) != 1: status.increaseRejectedCounter(); continue;
# if too little of the candidate is inside the domain, reject it
containedFace = containedFaces[0];
containedFaceArea = computeMagnitude(containedFace);
containedFace = containedFaces[0]
containedFaceArea = computeMagnitude(containedFace)
if containedFaceArea < 0.25*candidate.area():
status.increaseRejectedCounter(); continue;
......@@ -333,7 +337,7 @@ for e in entitySets[setId2]:
if not constraintsOnBoundary.evaluate(tunnelSurfaceShape, containedFace):
status.increaseRejectedCounter(); continue;
accepted = True;
accepted = True
area += containedFaceArea
entitySets[setId3].append(containedFace)
status.increaseCounter(setId3)
......@@ -342,7 +346,7 @@ for e in entitySets[setId2]:
if tryCount >= maxTriesForEntity: printSkipMessage()
# print the final entity density
domainVolume = computeMagnitude(domain);
domainVolume = computeMagnitude(domain)
numEntities = len(entitySets[setId1]) + len(entitySets[setId2]) + len(entitySets[setId3])
print("\nCreated a network consisting of {:d} entities.".format(numEntities))
print("Volume of the domain: {:.2f}.".format(domainVolume))
......@@ -354,7 +358,7 @@ print("Area of the network: {:.2f} m², which corresponds to a density of {:.2f}
print("Building and writing network")
from frackit.entitynetwork import ContainedEntityNetworkBuilder
builder = ContainedEntityNetworkBuilder();
builder = ContainedEntityNetworkBuilder()
# add sub-domains
builder.addConfiningSubDomain(domain, Id(1))
......@@ -362,7 +366,7 @@ for id in entitySets: builder.addSubDomainEntities(entitySets[id], Id(1))
# now we can build and write out the network in Gmsh file format
from frackit.io import GmshWriter
gmshWriter = GmshWriter(builder.build());
gmshWriter = GmshWriter(builder.build())
gmshWriter.setMeshSize(GmshWriter.GeometryTag.entity, 0.5)
gmshWriter.setMeshSize(GmshWriter.GeometryTag.subDomain, 5.0)
gmshWriter.write("network")
......
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