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 # Changelog 

 Last update: 19.09.2025 

Updates and fixes to the ZOS-API by OpticStudio release.

## <a class="anchor" id="CL25R202"></a>25 R2.02

- Updates
    - Added the OpticStudio instance number to [IZOSAPI\_Application](interface_z_o_s_a_p_i_1_1_i_z_o_s_a_p_i___application.xhtml), accessed via [IZOSAPI\_Application.OpticStudioInstance](interface_z_o_s_a_p_i_1_1_i_z_o_s_a_p_i___application.xhtml#a1a91274f0e60b435428cb17041fe2909)
    - Added NSC Stop Object support; see [ObjectType](namespace_z_o_s_a_p_i_1_1_editors_1_1_n_c_e.xhtml#afaeb02568d1df3bbfabfe7d8f9b59285), [IObjectStopElliptical](interface_z_o_s_a_p_i_1_1_editors_1_1_n_c_e_1_1_i_object_stop_elliptical.xhtml), and [IObjectStopRectangular](interface_z_o_s_a_p_i_1_1_editors_1_1_n_c_e_1_1_i_object_stop_rectangular.xhtml)
    - Updated STAR ZST file handling via the API:
        - UnloadData() now deletes STAR data files by default. Use UnloadDataAndKeepFiles() to maintain the previous behavior.
        - Added Name fields to STAR data files
        - See: [ISTAR\_TemperaturesFEAData](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___temperatures_f_e_a_data.xhtml), [ISTAR\_DirectIndexFEAData](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___direct_index_f_e_a_data.xhtml), [ISTAR\_StressFEAData](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___stress_f_e_a_data.xhtml), and [ISTAR\_DeformationsFEAData](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___deformations_f_e_a_data.xhtml)

## <a class="anchor" id="CL25R2"></a>25 R2

- Updates
    - Added support for the new [ISequenceSelector](interface_z_o_s_a_p_i_1_1_tools_1_1_sequences_1_1_i_sequence_selector.xhtml) tool, accessed via [IOpticalSystemTools.OpenSequenceSelector](interface_z_o_s_a_p_i_1_1_tools_1_1_i_optical_system_tools.xhtml#aeb9644084e959c5a97daea87372bc9cc)
    - Added high fidelity conversion options to [IConvertToNSCGroup](interface_z_o_s_a_p_i_1_1_tools_1_1_i_convert_to_n_s_c_group.xhtml)
    - Added a new [ISTARTools](interface_z_o_s_a_p_i_1_1_i_s_t_a_r_tools.xhtml) interface for working with external data files (see [STARSubsystem.Tools](interface_z_o_s_a_p_i_1_1_i_s_t_a_r_subsystem.xhtml#a88e4f64d105dc8d8845a7dd30422762a) on [IOpticalSystem](interface_z_o_s_a_p_i_1_1_i_optical_system.xhtml)).
- Deprecated
    - [ISTAR\_TemperaturesFEAData.ImportTemperatures](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___temperatures_f_e_a_data.xhtml#a5c519459f1aef5476aa2425193f2f92d): use [ImportTemperatures\_1](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___temperatures_f_e_a_data.xhtml#a7cf2c43a2495413917c1d76c9451a81e) instead
    - [ISTAR\_DirectIndexFEAData.ImportDirectIndex](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___direct_index_f_e_a_data.xhtml#a809289f7537e6039238cb51af6b79f30): use [ImportDirectIndex\_1](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___direct_index_f_e_a_data.xhtml#a3e4f902d0c7a062ca6df8451c6392b3b) instead
    - [ISTAR\_StressFEAData.ImportStress](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___stress_f_e_a_data.xhtml#a50812de68099ff8854f31d94ef24b404): use [ImportStress\_1](interface_z_o_s_a_p_i_1_1_editors_1_1_l_d_e_1_1_i_s_t_a_r___stress_f_e_a_data.xhtml#ac4e403f348e06d16d34f9d2d55b60178) instead

## <a class="anchor" id="CL25R101"></a>25 R1.01

- Fixes
    - Fixed a bug in the [IZRDReader](interface_z_o_s_a_p_i_1_1_tools_1_1_ray_trace_1_1_i_z_r_d_reader.xhtml) causing incorrect data for all segments except the first

## <a class="anchor" id="CL25R1"></a>25 R1

- Updates
    - Added the [MPVT](namespace_z_o_s_a_p_i_1_1_editors_1_1_t_d_e.xhtml#a66c8f2427d3a13328e9e87d248ac7d7da57cc8294091fbfb6cdace7d038f57603) operand
    - Added chief ray export and ray filter support to [IExportCAD](interface_z_o_s_a_p_i_1_1_tools_1_1_general_1_1_i_export_c_a_d.xhtml)