ZOSPy

About

Wrapper around the Ansys Zemax OpticStudio API that provides a more intuitive way to interact with the ZOS-API through Python using a .NET connection, as described in this Journal of Open Source Software paper. It thereby allows you to do more optics modelling with less coding.

In addition to full access to all the OpticStudio fucntions through the ZOS-API, ZOSPy provides the following features:

• Wrapper functions for several OpticStudio analyses in zospy.analyses;
• Easy access to solvers in zospy.solvers;
• Easy access to all API constants in zospy.constants;
• Autocomplete for all ZOS-API endpoints and constants;
• Solves common problems related to Python.NET 3 and interaction with the ZOS-API.

Waranty and liability

The code is provided as is, without any warranty. It is solely intended for research purposes. No warranty is given and no rights can be derived from it, as is also stated in the MIT license.

Installing

ZOSPy is available on PyPi

pip install zospy

And through conda:

conda install conda-forge::zospy

Dependencies

ZOSPy officially supports Python 3.9 - 3.12. It may work with older Python versions, but support is not provided for these versions.

Python packages

• Python for .NET 3.0.3
• pandas
• NumPy
• SemVer 3.0.2

Software

• Ansys Zemax OpticStudio

Compatibility

ZOSPy is tested with the following versions of Python and Ansys Zemax OpticStudio:

Zemax	20.3.2	23.1.0	23.2.1	24.1.0
Python 3.9	⚠	✔	✔	✔
Python 3.10	⚠	✔	✔	✔
Python 3.11	⚠	✔	✔	✔
Python 3.12	⚠			✔

✔: This version works without problems. ⚠: This version works, but the output of analyses can differ slightly from the used reference version (currently OpticStudio 23 R1.01).

Referencing

When publishing results obtained with this package, please cite our paper in the Journal of Open Source Software:

Vught, L. van, Haasjes, C. & Beenakker, J.W.M. (2024). ZOSPy: Optical ray tracing in Python through OpticStudio. Journal of Open Source Software, 9(96), 5756. https://doi.org/10.21105/joss.05756

Contributing

Please read our contribution guidelines prior to opening a Pull Request.

Basic usage

Initiating connection

The connection as extension to running software OpticStudio is initiated as:

import zospy as zp

zos = zp.ZOS()
oss = zos.connect("extension")

Make sure that the OpticStudio software is set up to be connected to as extension through the API. Alternatively, a standalone OpticStudio application can be launched by changing the last line to:

oss = zos.connect("standalone")

Using solvers

Solvers for the Lens Data Editor are available through zp.solvers. Every solver requires a surface as its first parameter.

Examples

import zospy.solvers as solvers

surface = oss.LDE.GetSurfaceAt(2)
solvers.position(surface.ThicknessCell, from_surface=1, length=10)

Performing analyses

Implemented analyses are available though zp.analyses. The available analyses are grouped in files that correspond to the analysis groups in OpticStudio (e.g. zp.analyses.mtfand zp.analyses.wavefront). Every analysis requires the OpticStudioSystem oss as first parameter.

Examples

from zp.analyses.mtf import fft_through_focus_mtf

mtf = fft_through_focus_mtf(oss, sampling='64x64', deltafocus=0.1, oncomplete='Close')

from zp.analyses.reports import cardinal_points

cp = cardinal_points(oss, surf1=3, surf2=4, oncomplete='Release')

A full description of the available function parameters is provided in the docstrings.

Constants

After initiating the connection, all api constants are available through zp.constants ( e.g. zp.constants.Editors.LDE.SurfaceType). Note that these are only available after zos.wakeup() has been called, as explained under Initiating connection.

Convenience functions

Some convenience functions are available through zp.functions, e.g. to change a surface to a standard stuface:

newsurf = oss.LDE.InsertNewSurfaceAt(0)
zp.functions.lde.surface_change_type(newsurf, 'Standard')

Full example

This example creates a simple optical system consisting of a single lens.

# Create a new, empty system
oss.new()

# Set aperture and wavelength
oss.SystemData.Aperture.ApertureType = zp.constants.SystemData.ZemaxApertureType.FloatByStopSize
oss.SystemData.Wavelengths.GetWavelength(1).Wavelength = 0.543  # in μm

# Set the object at infinity
surface_object = oss.LDE.GetSurfaceAt(0)
surface_object.Thickness = float("inf")

# Use a very small stop size, so the system is approximately paraxial
surface_stop = oss.LDE.GetSurfaceAt(1)
surface_stop.SemiDiameter = 0.1

# Add a lens with n = 1.5
lens_front = oss.LDE.InsertNewSurfaceAt(2)
lens_front.Comment = "lens front"
lens_front.Radius = 20
lens_front.Thickness = 1
zp.solvers.material_model(lens_front.MaterialCell, refractive_index=1.5)

lens_back = oss.LDE.InsertNewSurfaceAt(3)
lens_back.Comment = "lens back"
lens_back.Radius = -20
lens_back.Thickness = 19.792  # System is in focus

Logging

Some basic logging is implemented through the standard python logging module (but still under development). The following implementation examples assume that import logging has been executed.

1. To enable logging output from all ZOSPy and other modules using logging.basicConfig:

   logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')

2. To enable logging output from all ZOSPy and other modules using a root logger:

   fmt = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
   sh = logging.StreamHandler()
   sh.setFormatter(fmt)
   sh.setLevel(logging.DEBUG)
   
   logger = logging.getLogger()
   logger.addHandler(sh)

3. To enable logging output from only ZOSPy

   logging.getLogger('zospy').addHandler(logging.StreamHandler())
   logging.getLogger('zospy').setLevel(logging.INFO)

Contact

Feel free to contact us for any inquiries:

• C. Haasjes (email)
• J.W.M. Beenakker (email)
• L. van Vught (email)