![]() Clearly the tapes have very different reflective properties. Below is a shot from the camera feed of the above 3 markers. I couldn't get my hands on 3M 7610 so I experimented with different tapes and settled on some that has good flexibility and reflectivity (First marker in the above photo). In the end I went with 3D printing as it was cheap, quick and controlling size is simple. I thought it would be easy to find some sort of soft core, but it was really difficult to find something consistently sized and appropriate for tape adhesion. The base of the marker allows it to be attached to the subject in various ways. A very good choice for the tape is 3M 7610 due to its super high reflectivity and flexibility. The coating is often a highly reflective tape that is hand applied to the cores. The higher resolution the cameras, the smaller the markers can be, and really small markers can be used to track facial and finger movements. The core can be of various sizes and densities, it's useful to have a softer core that can be squished if an actor impacts a surface. Note that professional markers are readily available and can be purchased online, for a hefty price as with everything in the motion capture industry.Ī marker consists of a core, a coating and a base. In this log we'll look at the options I explored when trying to build my own passive markers. In previous logs I wrote about active markers which were powered by an LED and a coin cell. Some capabilities of control software that is run on a single host computer: Frame timing and marker processing extensions written in C++.Some details of the software that runs on a motion capture camera: Some capabilities and components of each motion capture camera: There is far more detail on the principles of motion capture online, here is a link to get you started if you're interested. Once the 3D positions of the markers have been recorded they can be used to reconstruct the motion of the actor in a 3D digital space. A typical system will consist of 6 or more cameras. ![]() It is called an optical system because it uses cameras to 'see' the markers. This motion capture system triangulates the 3D position of reflective spherical markers that have been placed in strategic positions on the human actor.
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