Again, the photon map is not used in the evaluation of these color components, which are implemented by tracing an extra ray, either symmetric with respect to the surface normal, or refracted following Snell's law [3]. The colors returned are blended with the other color components using the reflectivity and refractivity values of the material in use. Glossy reflection effects could be achieved by using an appropriate BRDF to determine the direction of the reflection, but we did not intend to achieve it.
![\includegraphics[%
width=0.50\textwidth]{reflected.eps}](img14.png)