Get Track Range(GetTrackRange)

The Get Track Range node's core function is to precisely extract data corresponding to a specified range from the input trajectory data, based on the user-defined starting frame index and the number of frames to capture.

The Get Track Range node is used to extract a sub-segment of specified starting position and length from a complete motion trajectory data sequence.

Node Function

Its core function is to precisely extract data corresponding to a specified range from the input trajectory data, based on the user-defined starting frame index and the number of frames to capture. It works by receiving a trajectory object containing path and visibility information, then, much like using scissors to cut a video, it retains only the segment you specify and outputs it as a new, shorter trajectory object. This is very useful for situations where you need to process specific segments within a long video.

Usage Scenarios

A typical usage scenario is in animation production, where you might have a long trajectory of a character walking but only want to further process or apply effects to the turning action part. In this case, Get Track Range can be used to precisely extract that segment. Another scenario is when trajectory data comes from a very long video sequence, and subsequent nodes (such as certain rendering nodes) have limitations on the number of frames they can process. It can be used to split the long trajectory into multiple short segments for batch processing.

Notes

Please note when using: the starting index (start_index) supports negative values, which represent counting backwards from the end of the trajectory. For example, -1 indicates the last frame. If the calculated extraction range exceeds the actual length of the original trajectory, the node will automatically clamp the range to the valid interval to ensure no errors occur.

Get Track Range Node Source Code Link

The Get Track Range node is from the ComfyUI-KJNodes node package.