BVH Reference Frame

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The first frame of a BVH file isn't displayed. It's used to determine which joints the animation controls. Only the joints that moved between the first and second frames will be affected.

Widespread falsehoods about the first frame include:

• it must not be changed or bad things (almost never specified) will happen

In fact, you usually do have to edit the first frame to properly control what joints the animation affects. Animations should almost never influence all joints.

• any joint with a non-zero value in the first frame will cause that joint to be affected

Second Life only attends to whether there is a difference between the joint values on the first and second frame, not the values themselves. If the joint has the same non-zero values in the first and second frame, that joint will not be animated!