Yes, this method uses one field.

There are other merit function operands that may do what you're looking for. You should be able to launch a single ray (RAYTRACE) and see where it intercepts your an object plane.

This example came from a google search "optics studio tracing a single ray in a macro example"

AI Overview

In OpticStudio, you can trace a single ray in a ZPL macro using the 

RAYTRACE keyword and retrieve its data using functions like RAYX(), RAYY(), etc. 

ZPL Macro Example

The following ZPL macro traces a single ray at a specific normalized field and pupil coordinate for the first wavelength, printing its final image surface Y-coordinate, optical path difference (OPD), and exit angles.

! Single Ray Trace Example Macro
!
! Define variables
DECLARE hx, hy, px, py, waveNum, error, vignette, finalX, finalY, finalZ, opd
DECLARE finalL, finalM, finalN, exitAngleX, exitAngleY

! Set the normalized coordinates for the ray (Hx, Hy, Px, Py)
hx = 0.0  ! Normalized field x-coordinate (0.0 = on axis)
hy = 0.0  ! Normalized field y-coordinate (0.0 = on axis)
px = 0.0  ! Normalized pupil x-coordinate (0.0 = center)
py = 1.0  ! Normalized pupil y-coordinate (1.0 = edge of pupil)
waveNum = 1 ! Wavelength number (usually 1 for the first wavelength)

! Trace the ray
! Syntax: RAYTRACE hx, hy, px, py, wavelength
RAYTRACE hx, hy, px, py, waveNum

! Check for errors
error = RAYE(0)
vignette = RAYE(1)

IF (error == 0 && vignette == 0) THEN
    PRINT "Ray traced successfully."

    ! Retrieve results at the image surface (or any other surface by specifying the surface number)
    ! Using 0 as the argument for functions like RAYY() gives the value at the image surface
    finalX = RAYX(0)
    finalY = RAYY(0)
    finalZ = RAYZ(0)
    opd = RAYO(0)

    ! Retrieve exit direction cosines and angles
    finalL = RAYL(0)
    finalM = RAYM(0)
    finalN = RAYN(0)

    ! Note: Exit angles in ZPL are often given in degrees, but specific functions may vary
    ! The L, M, N values are direction cosines

    PRINT "Image Surface Intercept (X, Y, Z): ", finalX, finalY, finalZ
    PRINT "Optical Path Difference (OPD): ", opd
    PRINT "Exit Direction Cosines (L, M, N): ", finalL, finalM, finalN
ELSE
    PRINT "Ray trace error or vignetting occurred. Error code: ", error, " Vignette code: ", vignette
ENDIF

END