This is just a general question about facial motion capture. We currently have facial motion capture (and we need to get it on a head using bones) but im wondering what the best way to map it onto our character is. Do you use motionbuilders tools or set up a custom rig using some form of constraints.
For facial Motion Capture- you can either use the in-built tools in Actor Face/Character Face to connect the marker data –or- use a custom setup with Bones/Constraints as you’ve suggested.
For info on MotionBuilder Actor/Character Face, refer to the Docs and see the links below:-
The following Book has a really good section on Facial Motion Capture describing the process to use in recording marker data for facial animation and connecting to custom rig with constraints:-
MoCap for Artists: Workflow and Techniques for Motion Capture
You should be able to order it on Amazon.
There’s also a number of third-party utilities and plugins that handle this. See below link for video showing NaturalPoint plugin:-