Handling Diffraction

Like reflection, diffraction changes the direction of rays that interact with the edges of an object. An edge can be a line segment or any rough transition between two adjacent surfaces. The angle of deflection depends on the angle between the incoming ray and the local direction of the edge at the point of incidence.

<TODO: add diffraction on straight edge image from MPT>

Unlike reflection, a ray is diffracted into a continuum of rays that form a cone-like structure around the edge.

# This tutorial is TODO