The topics in this section describe how to use motion-capture files in the HTR (Hierarchical Translation-Rotation) and TRC formats.
The HTR format is an alternative to the BVH format because it provides flexibility in data types and ordering. It also has a complete base pose specification, which consists of indicating the starting point for both rotations and translations. The stored data is grouped by segments; all motions from the first segment are read, then those from the next segment, and so on.
On import, 3ds Max constructs a FK hierarchy rig from the incoming data. The resulting bone skeleton is linked to a dummy object named after the HTR file.
You can import an HTR file directly into the CAT character-animation plug-in.
The HTR format contains four sections: Header, Segment Names & Hierarchy, Base Position, and the motion data section.
The header section contains global parameter information:
- File type
- Data type
- File version
- Number of segments
- Number of frames
- Data frame rate
- Euler rotation order
- Calibration units
- Rotation units
- Global axis of gravity
- Bone length axis
- Scale factor
HTR2 is nearly identical to HTR, except that the data from the motion section is organized differently in order to better suit a streaming data input (a sample-major ordering is used to present the motion information).