  In this paper, we use an original ray-tracing domain decomposition method to
address image rendering of naturally lighted scenes. This new method allows to
particularly analyze rendering problems on parallel architectures, in the case
of interactions between light-rays and glass material. Numerical experiments,
for medieval glass rendering within the church of the Royaumont abbey,
illustrate the performance of the proposed ray-tracing domain decomposition
method (DDM) on multi-cores and multi-processors architectures. On one hand,
applying domain decomposition techniques increases speedups obtained by
parallelizing the computation. On the other hand, for a fixed number of
parallel processes, we notice that speedups increase as the number of
sub-domains do.
