This is indeed a bug in vtkPLYReader. Attached is a patch that fixes the issue.
diff --git a/IO/PLY/vtkPLYReader.cxx b/IO/PLY/vtkPLYReader.cxx
index 437d87a..9cfe657 100644
--- a/IO/PLY/vtkPLYReader.cxx
+++ b/IO/PLY/vtkPLYReader.cxx
@@ -289,8 +289,8 @@ int vtkPLYReader::RequestData(
if ( intensityAvailable )
{
vtkPLY::ply_get_property (ply, elemName, &faceProps[1]);
- RGBCells->SetNumberOfComponents(1);
- RGBCells->SetNumberOfTuples(numPolys);
+ intensity->SetNumberOfComponents(1);
+ intensity->SetNumberOfTuples(numPolys);
}
if ( RGBCellsAvailable )
{
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