1. A method comprising: generating a positional relationship between one or more support structures having at least one motion capture mark and at least one virtual structure corresponding to geometry of an object to be tracked; positioning the support structures on the object to be tracked, the support structures having sufficient rigidity that, if there are multiple marks, the marks on each support structure maintain substantially fixed distances from each other in response to movement by the object; determining an effective quantity of ray traces between one or more camera views and one or more marks on the support structures; and estimating an orientation of the virtual structure by aligning the determined effective quantity of ray traces with a known configuration of marks on the support structures.