Variables for Average Ray Position
Some other variables for average ray position, both absolute and relative, are also defined. These variables exist with both physics scope and physics feature scope; for example, the variable gop.rrms is the RMS spot size for all rays in the model, but gop.relg1.rrms is the RMS spot size only for rays produced by Release from Grid 1.
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Components of the average ray position gop.qavex, gop.qavey, and gop.qavez, which are simple arithmetic means over the respective ray coordinates.
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Relative ray position gop.deltaqx, gop.deltaqy, and gop.deltaqz. These are the ray positions relative to the average ray position. for example, the relative x-component gop.deltaqx is qx-gop.qavex.
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RMS spot size gop.rrms.
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Maximum relative radial position gop.rmaxall.
Many Ray Optics tutorials use the RMS spot size as a figure-of-merit during postprocessing. For example, see the Petzval Lens: Application Library path Ray_Optics_Module/Lenses_Cameras_and_Telescopes/petzval_lens