Probuilder: get list of distinct indices

Hello guys,

I need help getting a list of distinct indices in Probuilder. I have saved the faces I want to apply planar projection to into an array, and now I need to get a list of distinct indices. I see that the ProbuilderMesh class has only count indices method, how can i get distincs indices?

I have tried the code freom this thread;
https://forum.unity.com/threads/probuilder-scripting-autounwrap-several-faces-at-one.750548/

But I don't see a getdistinctindices method... :/


Any help woud be appreaciated,

Best regards,

Svetlana