Geometrical theory of Diffraction is an
extension of geometrical optics aimed at taking into account diffraction
i.e.

light/sound propagating in the geometrical
shadow regions of an obstacle. We designed a system that can construct

and evaluate in real-time the contribution
of any hybrid reflection/diffraction path in a general 3D environment.

**Visualizing the diffraction coefficient**

The following picture shows the amplitude
of the diffraction coefficient computed using uniform GTD in the case

of a half-screen diffraction.

**Building the diffraction paths**

The following picture shows all hybrid
specular reflection/diffraction paths between a point source and

a point receiver. The highlighted edge
is the source of the diffraction.

A more complex example, showing all diffracting
edges visible from the receiver (in magenta)

either directly or through one specular
reflection and all hybrid diffracted/reflected path for 1 order of reflection

and 1 diffraction only !!!