  Order-independent transparency schemes rely on low-order approximations of
transmittance as a function of depth. We introduce a new wavelet representation
of this function and an algorithm for building and evaluating it efficiently on
a GPU. We then extend the order-independent Phenomenological Transparency
algorithm to our representation and introduce a new phenomenological
approximation of chromatic aberration under refraction. This generates
comparable image quality to reference A-buffering for challenging cases such as
smoke coverage, more realistic refraction, and comparable or better performance
and bandwidth to the state-of-the-art Moment transparency with a simpler
implementation.
