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Fix point merge for Marching Cubes with multiple isosurfaces

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When the Marching Cubes algorithm merges points together for multiple
isosurfaces, it uses an ArrayHandleZip to combine the isosurface id and
the edge identification. This is to prevent merging points from
different isosurfaces. However, internally this has to do an array copy.

It was doing this copy with `ArrayCopy`. A recent change to that method
made the copy fail for `ArrayHandleZip`. The fix is to change to
`ArrayCopyDevice`.

The reason why this bug was introduced was because there was no test
case for this specific use. A regression test has been updated to test
for this case.
This commit is contained in:
Kenneth Moreland 2022-03-21 11:44:36 -06:00
parent e1e3d4af2f
commit b544b8e09f
4 changed files with 9 additions and 13 deletions
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4
data/baseline/filter/contour-uniform.png
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@ -1,3 +1,3 @@
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oid sha256:558028eae0ddb162a3c437b7d12c30857f7b964b3dc9bda601e9750db0813fe5
size 31393

4
data/baseline/filter/contour-wedge.png
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@ -1,3 +1,3 @@
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size 4029
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size 35281

11
vtkm/filter/contour/testing/RenderTestContourFilter.cxx
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@ -33,18 +33,15 @@ void TestContourFilterWedge()
vtkm::cont::DataSet dataSet = reader.ReadDataSet();
vtkm::filter::contour::Contour contour;
contour.SetIsoValue(0, 1);
contour.SetIsoValues({ -1, 0, 1 });
contour.SetActiveField("gyroid");
contour.SetFieldsToPass({ "gyroid", "cellvar" });
contour.SetMergeDuplicatePoints(false);
contour.SetMergeDuplicatePoints(true);
auto result = contour.Execute(dataSet);
result.PrintSummary(std::cout);
vtkm::rendering::testing::RenderTestOptions testOptions;
testOptions.Colors = { { 0.20f, 0.80f, 0.20f } };
testOptions.EnableAnnotations = false;
testOptions.DataViewPadding = 0.08;
vtkm::rendering::testing::RenderTest(result, "gyroid", "filter/contour-wedge.png", testOptions);
}
@ -60,7 +57,7 @@ void TestContourFilterUniform()
vtkm::filter::contour::Contour contour;
contour.SetGenerateNormals(false);
contour.SetMergeDuplicatePoints(true);
contour.SetIsoValue(0, 100.0);
contour.SetIsoValues({ 50, 100, 150 });
contour.SetActiveField(fieldName);
contour.SetFieldsToPass(fieldName);
vtkm::cont::DataSet result = contour.Execute(inputData);
@ -69,8 +66,6 @@ void TestContourFilterUniform()
//Y axis Flying Edge algorithm has subtle differences at a couple of boundaries
vtkm::rendering::testing::RenderTestOptions testOptions;
testOptions.Colors = { { 0.20f, 0.80f, 0.20f } };
testOptions.EnableAnnotations = false;
vtkm::rendering::testing::RenderTest(
result, "pointvar", "filter/contour-uniform.png", testOptions);
}

3
vtkm/filter/contour/worklet/contour/MarchingCells.h
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@ -18,6 +18,7 @@
#include <vtkm/exec/ParametricCoordinates.h>
#include <vtkm/cont/ArrayCopy.h>
#include <vtkm/cont/ArrayCopyDevice.h>
#include <vtkm/cont/ArrayHandle.h>
#include <vtkm/cont/ArrayHandleIndex.h>
#include <vtkm/cont/ArrayHandleTransform.h>
@ -360,7 +361,7 @@ void MergeDuplicates(const vtkm::cont::Invoker& invoker,
vtkm::cont::ArrayHandle<vtkm::Id>& connectivity)
{
vtkm::cont::ArrayHandle<KeyType> input_keys;
vtkm::cont::ArrayCopy(original_keys, input_keys);
vtkm::cont::ArrayCopyDevice(original_keys, input_keys);
vtkm::worklet::Keys<KeyType> keys(input_keys);
input_keys.ReleaseResources();