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FrameMarkers

How do FrameMarkers work? Is it neccesary to create a dataset?

As of 1.5 frame markers are no longer contained in the dataset file. You create them programmatically at runtime instead. See the FrameMarkers sample, specifically the initTracker method in FrameMarkers.cpp. - Kim

[QUOTE=ksiva]As of 1.5 frame markers are no longer contained in the dataset file. You create them programmatically at runtime instead.

No, there's no way to limit the number of frame markers that are tracked simultaneously. There isn't much reason to do this from a performance standpoint.