Hi Chris,

Those are properties of your INSCRayTrace:

double  DeadRayErrors [get]

double  DeadRayThreshold [get]

You find this in the Syntax Help file under: ZOSAPI > Tools > RayTrace > INSCRayTrace. But there isn't much documentation about it.

Here is a code snippet showing you how to call those properties:

# Setup and run the ray trace

NSCRayTrace = TheSystem.Tools.OpenNSCRayTrace()

NSCRayTrace.ClearDetectors(0)

NSCRayTrace.SplitNSCRays = True

NSCRayTrace.ScatterNSCRays = True

NSCRayTrace.UsePolarization = True

NSCRayTrace.IgnoreErrors = True

NSCRayTrace.SaveRays = False

NSCRayTrace.RunAndWaitForCompletion()

print('Lost energy (errors): ', NSCRayTrace.DeadRayErrors)

print('Lost energy (thresholds): ', NSCRayTrace.DeadRayThreshold)

NSCRayTrace.Close()

print('Finished ray trace')

Let me know if this helps.

Take care,

David