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A specially designated set of attribute curves can be authored on a bone
to encode timecode metadata for an animation sequence. Each attribute
encodes a different component of a complete timecode and subframe value
("TCHour", "TCMinute", "TCSecond", "TCFrame", and "TCSubframe"). The
convention is to author these attribute curves on the root bone of the animation.
This adds a function for evaluating those attributes at a particular time, and the result
is returned as a qualified frame time. If the anim sequence has an import file frame rate
specified, then that rate is used for the returned qualified frame time to more closely
match the original source of the animation. Otherwise, the sampling frame rate of the
anim sequence is used. If the root bone does not have any timecode attributes or they
otherwise cannot be evaluated (for example, because they have no keys), the function
returns false, and the qualified frame time passed by reference is unmodified.
Finally, this new function is used for the frame time hint of skeletal animation tracks in
Sequencer. Anim sequences that have these attributes authored will show the authored
timecode/frame values in the frame time hint when they are selected. This enables more
easily correlating a point in time in the anim sequence with where it came from in an
external DCC.
#rb benoit.deschenes, max.chen
#preflight 619d6f48aa4521f9e7a4e183
#ROBOMERGE-AUTHOR: matt.johnson
#ROBOMERGE-SOURCE: CL 18316998 in //UE5/Release-5.0/... via CL 18317391
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Staging -> Release-Engine-Test) (v895-18170469)
[CL 18317981 by matt johnson in ue5-release-engine-test branch]