Develop Tools to Remove Clutter

It doesn't matter how fast the workstations is if the human can't keep up.

• Even the IBM5080s (thrown out last month) could display more than the viewer could handle

SLD's strategies for removing clutter

• Isolate
  • an example of a complete event
  • the same event with a single calorimeter cluster and its related hits isolated
• Highlight
  • note the large yellow calorimeter cluster to the left
  • the user has now set the display to color that cluster and its associated hits as black. Access to IDA's interpreted command language and Jazelle's pointer-driven data structures allows SLD Event Display users to have colors reassigned to show Physics relationships among the data.
• Cuts
  • charged tracks and all calorimeter clusters
  • the same event with an event display cut on calorimeter cluster energy. In our SGI implementation, such cuts can adjusted and the results seen just by spinning a dial (the relevant cut parameters are kept in the final display list, there is no need to reread the raw data).

Pre-Pick Highlighting

• Discovered by accident on Mark III, an artifact of the way the IBM5080 graphics system handled pick IDs
• When the cursor is placed over a pickable object
• Without any pick operation (without hitting the mouse button)
• The object highlights

• Similiar to what later became cursor focus in an X system
• Similiar to what later became balloon help on some windowing systems
• Replicated intentionally in SLD's UGSERVER on the SGI
• Something we wish we had on our desktop X Terminals

Questions of Morality

• The SLD Display's programmable object pick features make it easy to write a script on the fly for what should happen when you pick on an object.
• Could easily write a script for "Delete Any Picked Object" (allowing easy cleanup of such extraneous features as SLC muon hits often seen all on their own in the outer layers or our detector).
• But should we?

In what ways is it acceptable to "clean up" Event Displays?

What kind of "cleaning up" is OK

• Automated, Physics based, not "by hand"
• Use as teaching tools rather than as presentation of results