hi Hassan,
user-defined photon launch angular distribution has been supported since mcx v2024.2
see built-in demo script
https://github.com/fangq/mcx/blob/master/mcxlab/examples/demo_mcxlab_launchangle.m
help information on how to set cfg.angleinvcdf can be found in the mcxlab's help info
https://github.com/fangq/mcx/blob/v2025/mcxlab/mcxlab.m#L130-L148
Qianqian
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