1. A method, comprising: receiving at least one stream of input images representing a physical scene having three spatial dimensions and a temporal dimension, representing a movement of at least two natural objects in the physical scene, at least one of the at least two natural objects being alive; processing at least the at least one stream of input images, with at least one automated processor, to generate a spatial and temporal computer model of the at least two natural objects, moving and interacting according to a set of intrinsic parameters describing at least a first motion of the at least two natural objects in the physical scene, comprising both first independent motion and first contact between the at least two natural objects, consistent with the laws of physics comprising at least conservation of mass, conservation of momentum, and conservation of energy of the at least two natural objects; receiving a set of extrinsic parameters which are distinct from the set of intrinsic motion parameters, the set of extrinsic parameters describing at least a second motion of the at least two natural objects interacting in the physical scene, comprising both second independent motion and second contact between the at least two natural objects, the first independent motion being different from the second independent motion and the first contact being different from the second contact; receiving at least one statistic for a random variable associated with an outcome of the second motion and the second contact, comprising a likelihood of an injury to the at least one of the at least two natural objects which is alive, as a result of at least the set of extrinsic parameters; rendering the spatial and temporal computer model, with the at least one automated processor, to define a spatial and temporal representation of the at least two natural objects within the physical scene according to at least the set of extrinsic parameters, portions of the set of intrinsic parameters consistent with the set of extrinsic parameters, and a performance statistic for a predefined activity represented in the defined spatial and temporal representation; and generating a rendered output of the animated computer model, with the at least one automated processor, as at least one stream of output images defining at least two spatial dimensions and a temporal dimension.