Excluded derived ColorTable nodes (such as vtkMRMLDiffusionTensorDisplayPropertiesNode) from the LUT selection since they may not contain LUT's

http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=21306

The FreeSurfer procedural color nodes are missing from the Volumes module, Display, Lookup Table drop down menu.
The nodes appear in the Colors module and it would be nice to be able to use them for volumes.
Could we make the hiding of child node types finer grained through the use of the hideChildNodeTypes list so that the Freesurfer nodes can still be used while the non LUT bearing ones are excluded?

bluered = getNode("vtkMRMLFreeSurferProceduralColorNodeBlueRed")

lut = bluered.GetLookupTable()

print lut

shows a valid look up table.

From the dev mailing list:
PET lookup tables are not accessible any more in Volumes

This will be discussed during MArch 19th 2013 Developer Hangout. See http://www.slicer.org/slicerWiki/index.php/Developer_Meetings/20130319

In
Slicer/Modules/Loadable/Volumes/Widgets/Resources/UI/qSlicerScalarVolumeDisplayWidget.ui
the ColorTableComboBox has it's property showChildNodeTypes set to false.

Looking at the color node tree:
http://slicer.org/doc/html/classvtkMRMLColorNode.html
we don't want to allow selecting vtkMRMLDiffusionTensorDisplayPropertiesNode or vtkMRMLGlyphableVolumeDisplayPropertiesNode nodes but we do want to be able to select procedural color nodes.

As discussed during Developer hangout of May 14th, here is the proposed action plan:

1) Revert commit 21306

• Make the code robust to prevent the crash

  2) Update ColorTableComboBox to exclude unwanted child type

  3) Eventually, explore how the class hierarchy could be updated to avoid the workaround (2)

As discussed in the developer hangout [1] we should do the following:

1 - revert the change so that the the pet and other color nodes show up in the volumes module

2 - figure out why these can cause a crash when trying to display the result of the diffusion tensor scalars and fix the crash

3 - look into adding attributes to the glyphable and diffusion tensor color nodes so they are hidden from the user in the Volumes module while other color table nodes and subclasses are displayed.

http://www.slicer.org/slicerWiki/index.php/Developer_Meetings/20130514#To_discuss

Fixed the cause of the crash because of invalid LUT in vtkMRMLDiffusionTensorDisplayPropertiesNode

At revision: 22006 - http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=22006

Thanks!