1. A system for computing output using a non-contact input signal, the system comprising: a computer programmed to perform a method for generating an input control signal and including the operations of: acquiring depth data of a scene captured by a depth-capable sensor; generating a temporal series of depth maps corresponding to the depth data; generating at least one volumetric attribute based on the depth data determined from the series of depth maps, the generating including: for each depth map, generating a binary image of a subject detected in the each depth map, segmenting the binary image into regions, comparing pixels corresponding to a select region of interest across the temporal series of depth maps to determine a change in a shape of the region, associating the change in the shape with a volumetric attribute; determining one of an optimal pose of the subject and an optimal orientation of the subject using a breath analyzer in communication with the computer; providing the one of the pose and orientation to an output device as an output, and providing a pose recommendation feedback for improving a quality of the depth data; and generating an input control signal based on the volumetric attribute to enable the subject to interact with an output device.