BUG: Add VTKPolyDataMeshIO FIELD data support (forward-port of #4859)#6188
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hjmjohnson wants to merge 1 commit intoInsightSoftwareConsortium:mainfrom
Draft
BUG: Add VTKPolyDataMeshIO FIELD data support (forward-port of #4859)#6188hjmjohnson wants to merge 1 commit intoInsightSoftwareConsortium:mainfrom
hjmjohnson wants to merge 1 commit intoInsightSoftwareConsortium:mainfrom
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@greptileai review this draft before I make it official |
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Add reading of VTK legacy FIELD data entries in both POINT_DATA
and CELL_DATA sections. When FIELD data is present and the number
of tuples matches the point/cell count, the data is read as a
VariableLengthVector pixel type.
`ReadMeshInformation` detects the `FIELD FieldData N` keyword and
parses the first array's header (`<name> <numComponents> <numTuples>
<dataType>`) to set the IO metadata. The matching
`Read{Point,Cell}DataBufferAs{ASCII,BINARY}` helpers now also consume
that array-header line after the `FIELD` keyword so the actual data
block lines up; without that step `itkMeshFileReadWriteTestField`
fails because the reader treats the array header as data.
Only the first field-data array per section is used; additional
arrays are silently skipped. Add a test with a `gourd.vtk` file
that exercises the FIELD data path.
Forward-port of InsightSoftwareConsortium#4859 from `release-5.4` to `main`.
Co-Authored-By: Matt McCormick <matt@mmmccormick.com>
Co-Authored-By: Hans Johnson <hans-johnson@uiowa.edu>
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Forward-port of #4859 from
release-5.4tomain, with the bug that madeitkMeshFileReadWriteTestFieldfail now fixed.What this adds
Reading of VTK legacy
FIELDdata entries insidePOINT_DATA/CELL_DATAsections of.vtkPolyData files. When aFIELD FieldData Nblock is present and the first array's tuple count matches the point/cell count, the data is read as aVariableLengthVectorpixel. Additional arrays in the same field are silently skipped.The
gourd.vtktest fixture exercises the path via the newitkMeshFileReadWriteTestFieldtest.The bug that made #4859's test fail
The original PR added
FIELDdetection only inReadMeshInformation— it setm_PointPixelType=VARIABLELENGTHVECTORandm_NumberOfPointPixelComponentsbut didn't teachRead{Point,Cell}DataBufferAs{ASCII,BINARY}how to parse the FIELD layout. Those helpers only knew to skipSCALARS+LOOKUP_TABLEor bareVECTORS/NORMALS/TENSORSheaders. For a FIELD section the file has an extra array-header line:That extra line was never consumed, so
ReadComponentsAsASCII(or theinputFile.readblock in the binary path) started parsing the array header as the first values — producing garbage and trippingitkMeshFileReadWriteTestField.The fix adds a
find("FIELD")branch alongside the existingSCALARSbranch in all four buffer readers, consuming the array-header line before falling through to the value read.Closes #4859.