2013 Summer Project Week:Parameter heirarchy

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Key Investigators

  • Queen's: Adam Rankin
  • Queen's: Andras Lasso
  • Queen's: Tamas Ungi


The goal is to develop a module that creates and utilizes a new hierarchy based on definable parameters. This will allow us to characterize data by time.

Approach, Plan

  • Review existing time hierarchy discussion
  • Learn technical details about hierarchies
  • Discuss architecture of a flexible, abstract parameter hierarchy
  • Implement said hierarchy


  • Discussed approach to be taken, concerns regarding performance
  • Node count can explode into the thousands, performance analysis needed
    • Initial test performance analysis run, results concerning
      • Create hierarchies with 1500 and 7000 nodes, observed
      • Create hierarchy with 250 * 5 (1 volume, 4 transforms per frame) nodes
        • Slider in widget tied to logic to replace current view volume contents with the contents of the frame indexed by slider value
          • Deep copy used
        • Allocate nodes, add to scene ~25 seconds
        • Able to drag slider, occasional stuttering
        • Run1
        • Run2

To do:

  • Implement importer/exporter for MHA

Delivery Mechanism

This work will be delivered to the NA-MIC Kit as a Slicer module in the SlicerIGT extension.