In principle, a BVH file many contain any number of skeleton hierarchies.
After this hierarchy is described it is permissable to define another hierarchy, this too would be denoted by the keyword "ROOT". The following line starts with the keyword "ROOT" followed by the name of the root segment of the hierarchy to be defined. The start of the header section begins with the keyword "HIERARCHY".
Examine the example BVH file called " Example1.bvh". The BVH format is an excellent all around format, its only drawback is the lack of a full definition of the basis pose (this format has only translational offsets of children segments from their parent, no rotational offset is defined), it also lacks explicit information for how to draw the segments but that has no bearing on the definition of the motion.Ī BVH file has two parts, a header section which describes the hierarchy and initial pose of the skeleton and a data section which contains the motion data. This format mostly replaced an earlier format that they developed, the BVA format which is discussed in the next section, as a way to provide skeleton hierarchy information in addition to the motion data. The name BVH stands for Biovision hierarchical data. The BVH file format was originally developed by Biovision, a motion capture services company, as a way to provide motion capture data to their customers.
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