Issues with LineViewer

[Owen Arnold]

LineViewer isn't identifying features from the 2D slice viewer plot.

• Load the SEQMDEW file
• View in the SliceViewer
• Generate line Cuts. The preview looks right, but when you let go of the cursor, the BinMD generated plots are completely different. (See attachement generated by Jon Taylor)

[Owen Arnold]

This reproduces the issue on OSX. Mantid version taken from todays nightly builds:

Load(Filename='/Users/spu92482/Desktop/SEQ_Gd1.nxs', OutputWorkspace='SEQ_Gd1', LoaderName='LoadMD', LoaderVersion=1)
BinMD(InputWorkspace='SEQ_Gd1', AlignedDim0='[0,0,Ql], -5.000000, 2.200000, 200', AlignedDim1='[0.5Qh,0.866Qk,0], -3.000000, 3.000000, 200', AlignedDim2='DeltaE, -10.000000, 45.000000, 50', AlignedDim3='[Qh,0,0], -3.000000, 3.000000, 1', OutputWorkspace='SEQ_Gd1_visual_md')

# The following line was created using the LineViewer. The preview of the line is correct, but the actual line has missaligned peaks.
BinMD(InputWorkspace='SEQ_Gd1_visual_md', AxisAligned=False, BasisVector0='X,units,0.998714,0.0507049,0,0', BasisVector1='Y,units,-0.0507049,0.998714,0,0', BasisVector2='2,units,-0,-0,1,0', BasisVector3='3,units,-0,-0,0,1', Translation='-1.2454,-0.0275229,0,0', OutputExtents='0,2.38835,-0.141738,0.141738,-0.1,0.1,-0.1,0.1', OutputBins='100,1,1,1', OutputWorkspace='SEQ_Gd1_visual_md_line')

[Owen Arnold]

Load(Filename='/Users/spu92482/Desktop/SEQ_Gd1.nxs', OutputWorkspace='SEQ_Gd1', LoaderName='LoadMD', LoaderVersion=1)
BinMD(InputWorkspace='SEQ_Gd1', AlignedDim0='[0,0,Ql], -5.000000, 2.200000, 200', AlignedDim1='[0.5Qh,0.866Qk,0], -3.000000, 3.000000, 200', AlignedDim2='DeltaE, -10.000000, 45.000000, 50', AlignedDim3='[Qh,0,0], -3.000000, 3.000000, 1', OutputWorkspace='SEQ_Gd1_visual_md')
BinMD(InputWorkspace='SEQ_Gd1_visual_md', AxisAligned=False, BasisVector0='X,units,0.999934,-0.0114657,0,0', BasisVector1='Y,units,0.0114657,0.999934,0,0', BasisVector2='2,units,-0,0,1,0', BasisVector3='3,units,-0,0,0,1', Translation='-1.43012,0.0325067,0,0', OutputExtents='0,1.54644,-0.23371,0.23371,-0.1,0.1,-0.1,0.1', OutputBins='100,1,1,1', OutputWorkspace='SEQ_Gd1_visual_md_line')
plotMD('SEQ_Gd1_visual_md_line') # Should contain two peaks at [0,0,Ql] = 0 and [0,0,Ql] = 1. Does in the preview, but not in the rebinned plot.

[Andrei Savici]

Check if you have enough width of the line (same as the slice viewer). There is a ticket about that #5315

[Owen Arnold]

Replying to Andrei Savici:

Check if you have enough width of the line (same as the slice viewer). There is a ticket about that #5315

Will do. I'm not sure that that's the real issue, but thanks for the pointer.

[Owen Arnold]

Looks like the issue is not to do with BinMD. The issue seems to be in the 'Thickness' selection. The thickness for integrated dimensions should default to the full range for that dimension.

[Owen Arnold]

Replying to Owen Arnold:

Load(Filename='/Users/spu92482/Desktop/SEQ_Gd1.nxs', OutputWorkspace='SEQ_Gd1', LoaderName='LoadMD', LoaderVersion=1)
BinMD(InputWorkspace='SEQ_Gd1', AlignedDim0='[0,0,Ql], -5.000000, 2.200000, 200', AlignedDim1='[0.5Qh,0.866Qk,0], -3.000000, 3.000000, 200', AlignedDim2='DeltaE, -10.000000, 45.000000, 50', AlignedDim3='[Qh,0,0], -3.000000, 3.000000, 1', OutputWorkspace='SEQ_Gd1_visual_md')
BinMD(InputWorkspace='SEQ_Gd1_visual_md', AxisAligned=False, BasisVector0='X,units,0.999934,-0.0114657,0,0', BasisVector1='Y,units,0.0114657,0.999934,0,0', BasisVector2='2,units,-0,0,1,0', BasisVector3='3,units,-0,0,0,1', Translation='-1.43012,0.0325067,0,0', OutputExtents='0,1.54644,-0.23371,0.23371,-0.1,0.1,-0.1,0.1', OutputBins='100,1,1,1', OutputWorkspace='SEQ_Gd1_visual_md_line')
plotMD('SEQ_Gd1_visual_md_line') # Should contain two peaks at [0,0,Ql] = 0 and [0,0,Ql] = 1. Does in the preview, but not in the rebinned plot.

I now understand that this doesn't work because the lineviewer has set bad default outputextents of (-0.1, 0.1 for the integrated dimension). These should be +3, -3

[Owen Arnold]

refs #9812. Default to max integration width.

Changeset: f4d946192acb5a7f190b0a8fdc65092f4275a256

[Owen Arnold]

Tester:

• Run the script below
• Open the binned 'SEQ_Gd1_visual_md' workspace in the SliceViewer
• Use the screen shot to reproduce the plot. You should find that the 'Thickness' defaults to 3 not 0.1 for the integrated dimension and that upon releasing the end of the line, the integrated workspace is not zero as it was in the original screenshot. You should see a plot that matches the integrated line region selected (which should also closely match your your preview)

Load(Filename='/Users/spu92482/Desktop/SEQ_Gd1.nxs', OutputWorkspace='SEQ_Gd1', LoaderName='LoadMD', LoaderVersion=1)
BinMD(InputWorkspace='SEQ_Gd1', AlignedDim0='[0,0,Ql], -5.000000, 2.200000, 200', AlignedDim1='[0.5Qh,0.866Qk,0], -3.000000, 3.000000, 200', AlignedDim2='DeltaE, -10.000000, 45.000000, 50', AlignedDim3='[Qh,0,0], -3.000000, 3.000000, 1', OutputWorkspace='SEQ_Gd1_visual_md')

[Owen Arnold]

Update to critical, as this fix should get into the upcoming 3.2 release.

[Michael Reuter]

#9844 was generated from observations while testing this ticket.

[Owen Arnold]

refs #9812. Default to max integration width.

Changeset: 6300def9e91f92ea595b8d10c3e34cd16050608f

[Michael Reuter]

Merge remote-tracking branch 'origin/feature/9812_line_viewer_defect'

Full changeset: ​023aa5a092574ea3c11467326a6374e1f12b168e

[Stuart Campbell]

This ticket has been transferred to github issue ​10654