Reflect on backside.
We used this option
already on page 2
of this tutorial. If
turned on, reflec-
tions for back facing
surfaces will be
computed too.
Use irradiance map:
if you turn this off,
the irradiance map
will not be used
on this material.
Instead, the GI on
this material will
be computed with
QMC GI. This can
be useful if the
irradiance map blurs
out small shadow
details on certain
objects.
Treat glossy rays as GI rays: please refer to the manual.
Energy preservation
mode: please refer