What does the layer param flag PF_ParamFlag_LAYER_PARAM_IS_TRACKMATTE do exactly?

Question

AE_Effect.h wrote:/* only valid for layer parameters. indicates that a layer param is used as a track-matte with applied filters (used in Premiere, ignored in AE) */PF_ParamFlag_LAYER_PARAM_IS_TRACKMATTE			= PF_ParamFlag_USE_VALUE_FOR_OLD_PROJECTS,I applied this flag to a layer parameter, and thought that after the user specifying the layer parameter, the selected layer would act like a track matte layer in the track matte effect (invisible under normal circumstances).However, this flag seemed to mess up the checked out layer data instead.So, my question is: what exactly does this flag do?

bbb_999 · Answer

As the docs say: PF_ParamFlag_LAYER_PARAM_IS_TRACKMATTE indicates that a layer param is used as a track-matte with applied filters.

Based on the docs, I would be surprised if the flag affected the output of a different effect; the docs suggest that your effect will be using it as a track matte.

In what specific ways does the checked out layer data seem ‘messed up’?

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