Hide layer from parameter like in 'Track matte key' effect

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hi,

 

i developing video effect plugin premiere (but ae sdk, decided write in forum).

i have functionality similar 'track matte key' effect shipped application.

specifically, want layer, selected parameter, not visible directly. in plugin can access layer's data, still visible , covers composition.

i haven't found in documentation, examples or other questions here.

anyone knows how it?

 

edit:

there param flag pf_paramflag_layer_param_is_trackmatte, effect after checkout empty buffer. flag related first question , how use correctly?



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