SIMION®
The field and particle trajectory simulator
Industry standard charged particle optics software
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SIMION v8.1.3.0-TEST posted.
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SIMION 8.0 Issues/Bugs/Enhancements

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Issue I527 [defect,high,gem]
  PA empty or truncated when importing from GEM.

  Upon converting a GEM file to a potential array, points
  outside certain X, Y, and Z bounds may be missing in the PA.
  Most likely, the PA is completely empty.

  The problem occurs only when the object in the GEM file
  has boundaries that extend to +- infinity.  For example, a
  "notin" fill contains all points outside the selected
  region, extending to infinity.  This bound was wrongly getting
  truncated to an integer following refactoring in 8.0.5-TEST26.

  One example that exhibited this is examples\gauss_law\sc2d.gem :

    pa_define(130,130,1,cylindrical,xy)
    e(-333.3333) { fill { notin  { circle(0,0,119) } } }
    e( 500.0000) { fill { within { circle(0,0,80) } } }

  Reported by Bouaziz-20090520
    -- http://www.simion.com/discuss/viewtopic?p=3031

  The problem only affects 8.0.5-TEST26 to 8.0.5-TEST32.
  Resolved in 8.0.5-TEST33.

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