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I would take a different approach.
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<div>I would look at all the edges that have only 1 cell attached, and these are your boundary edges. </div>
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<div>For each boundary edge, create 2 triangles (a quad) with 1 or 2 points at z=0. (Create 2 new points at z=0 for this purpose). If you already have a point at that z=0, then reuse it don’t create it. </div>
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<div>That approach will create quads all around your geometry connecting to the bottom but will leave the bottom hole open.</div>
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<div>Next create a cell connecting all your z=0 points together. Make sure they are ordered in sequential order to create your contour loop.</div>
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<div>Done</div>
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<div id="AppleMailSignature">Sent from my iPhone</div>
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On Jul 13, 2018, at 05:10, Jacky Nguyen <<a href="mailto:jackynguyen.km@gmail.com">jackynguyen.km@gmail.com</a>> wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div dir="ltr"><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">I have converted an .obj mesh file
to .stl. I also created a planar geometry as a holder for the mesh object then merge them. However, it contains a gap. Any suggestion how to close the gap vertically so that it becomes a solid object, I have already tried vtkFillHolesFilter, but it won't fill
the gap?</span><br>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br>
</span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">The
code to create the planar:</span><br>
</span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br>
</span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">
<pre style="margin:0px 0px 1em;padding:5px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif;font-size:13px;vertical-align:baseline;box-sizing:inherit;width:auto;max-height:600px;overflow:auto;background-color:rgb(239,240,241);word-wrap:normal;text-decoration-style:initial;text-decoration-color:initial"><code style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif;font-size:13px;vertical-align:baseline;box-sizing:inherit;background-color:rgb(239,240,241);white-space:inherit">implicitPolyDataDistance = vtk.vtkImplicitPolyDataDistance()
implicitPolyDataDistance.SetInput(stl_poly_data)
#create a grid
xCoords = vtk.vtkFloatArray()
for x, i in enumerate(np.linspace(xmin, xmax,50)):
xCoords.InsertNextValue(i)
yCoords = vtk.vtkFloatArray()
for y, i in enumerate(np.linspace(ymin, ymax, 50)):
yCoords.InsertNextValue(i)
zCoords = vtk.vtkFloatArray()
for z, i in enumerate(np.linspace(zmin, zmin + 1, 50)):
zCoords.InsertNextValue(i)
rgrid = vtk.vtkRectilinearGrid()
rgrid.SetDimensions(x + 1, y + 1 , z + 1)
rgrid.SetXCoordinates(xCoords)
rgrid.SetYCoordinates(yCoords)
rgrid.SetZCoordinates(zCoords)
signedDistances = vtk.vtkFloatArray()
signedDistances.SetNumberOfComponents(1)
signedDistances.SetName("SignedDistances")
# Evaluate the signed distance function at all of the grid points
for pointId in range(rgrid.GetNumberOfPoints()):
p = rgrid.GetPoint(pointId)
signedDistance = implicitPolyDataDistance.EvaluateFunction(p)
signedDistances.InsertNextValue(signedDistance)
# add the SignedDistances to the grid
rgrid.GetPointData().SetScalars(signedDistances)
# geometry filter to view the background grid
geometryFilter = vtk.vtkRectilinearGridGeometryFilter()
geometryFilter.SetInputData(rgrid)
geometryFilter.SetExtent(0, x + 1, 0, y + 1, (z + 1) // 2, (z + 1) // 2)
geometryFilter.Update()
# ================ END creating a plane =======================</code></pre>
</span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br>
</span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">The
code that merge the stl poly data and the plane:</span><br>
</span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">
<pre style="margin:0px 0px 1em;padding:5px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif;font-size:13px;vertical-align:baseline;box-sizing:inherit;width:auto;max-height:600px;overflow:auto;background-color:rgb(239,240,241);word-wrap:normal;text-decoration-style:initial;text-decoration-color:initial"><code style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif;font-size:13px;vertical-align:baseline;box-sizing:inherit;background-color:rgb(239,240,241);white-space:inherit">meshAppend = vtk.vtkAppendPolyData()
meshAppend.AddInputData(stl_poly_data)
meshAppend.AddInputData(geometryFilter.GetOutput())
meshAppend.Update()
boundaryClean = vtk.vtkCleanPolyData()
boundaryClean.SetInputData(meshAppend.GetOutput())
boundaryClean.Update()
out = vtk.vtkPolyData()
out.DeepCopy(boundaryClean.GetOutput())
triangleTrans = vtk.vtkTriangleFilter()
triangleTrans.SetInputData(out)
triangleTrans.Update()
fill = vtk.vtkFillHolesFilter()
fill.SetInputData(out)
fill.SetHoleSize(1000000.0)
fill.Update()</code></pre>
<br>
</span></span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br>
</span></span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">A
screenshot of what my current mesh is (note: the red line is where i want to close the gap vertically along the z axis: <a href="https://i.stack.imgur.com/F9w3c.png">https://i.stack.imgur.com/F9w3c.png</a></span></span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br>
</span></span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Any
suggestion to solve this problem?</span></span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br>
</span></span></span></div>
<div><span style="color:rgb(36,39,41);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;text-align:left;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Thank
you</span></span></span></div>
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</blockquote>
<blockquote type="cite">
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