vtkBandedPolyDataContourFilter line cells are assigned incorrect contour index
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
vtkBandedPolyDataContourFilter (BPDCF) assigns a contour index to line cells. Depending on whether the contoured value increases or decreases when going from a line point to the next this index number may be off by one.
The attached python script demonstrates the issue. Four viewports show 4 distinct cases of this anomaly. A quad is contoured properly but line cells around the quad are not. The python script describes the details of each of the 4 cases.