Motion Capture is the process of recording a live motion event and translating it into usable mathematical terms by tracking a number of key points in space over time and combining them to obtain a single three-dimensional (3D) representation of the performance. the key points are the areas that best represent the motion of the subjects different moving parts.
Menacho, Alberto: Understanding Motion Capture for Computer Animation, 2011
The vast movement of a galopping horse were first brought into a comprehensible and measurable form by eadward muybridge almost 140 years ago. Up to this point, people were discussing, whether all 4 feet of a galopping horse were in the air at once, or not. This argument seems ridiculous from todays technical standpoint, where you can reduce this, to the bare eye incomprehensible locomotion, to a really small amount of threedimensional coordinates. Most of the times this data get's used to achieve realistic movements on digital avatars for animation movies or videogames. But the installation "horsegalopping.bvh" uses one frame of the pure MOCAP-Data, hence an assemblage of 30 three dimensional coordinates and transfers them back into the real-life realm using ceramic spheres. The end result is a sculpture of a horse reduced on those key-points that best represent it's movement.
A Small Youtube Clip demonstrating the process of tracking a horse's movement.