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 # Changelog 

 Last update: 17.07.2025 

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

## <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)